authorization
bseayin
parent
38c36bd954
commit
65862d538b
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@ -11,5 +11,8 @@
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="library" name="Maven: org.projectlombok:lombok:1.18.8" level="project" />
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<orderEntry type="library" name="Maven: com.alibaba:fastjson:1.2.55" level="project" />
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<orderEntry type="library" name="Maven: com.google.code.gson:gson:2.8.5" level="project" />
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</component>
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</module>
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@ -11,5 +11,25 @@
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<artifactId>corejava</artifactId>
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<dependencies>
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<!--lombok,简化实体类,mybatis plus和它很搭配-->
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>fastjson</artifactId>
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<version>1.2.55</version>
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</dependency>
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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</dependency>
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</dependencies>
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</project>
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@ -0,0 +1,16 @@
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package com.zz.classdemo;
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import lombok.Data;
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import java.util.Set;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/25$ 21:44$
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*/
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@Data
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public class ClassDTO {
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private String name;
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private String students;
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}
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@ -0,0 +1,18 @@
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package com.zz.classdemo;
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import lombok.Data;
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import java.util.Set;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/25$ 21:42$
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*/
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@Data
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public class ClassMaster {
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private String name;
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private Set<Student> students;
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}
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@ -0,0 +1,38 @@
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package com.zz.classdemo;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/25$ 21:28$
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*/
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public class Student {
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private String name;
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private Integer age;
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public Student() {
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}
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public Student(String name,Integer age) {
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this.name = name;
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this.age = age;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Integer getAge() {
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return age;
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}
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public void setAge(Integer age) {
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this.age = age;
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}
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}
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@ -0,0 +1,148 @@
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package com.zz.classdemo;
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import com.zz.thread.Count;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/25$ 21:21$
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*/
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public class Test {
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public static void main(String[] args) {
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// Count count=new Count();
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// Class c=count.getClass();
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// //利用反射 获取一个类的所有属性
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// Field[] fs=c.getDeclaredFields();
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// for(Field field:fs){
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// System.out.println(field.getName());
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// }
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try {
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testConstructor();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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public static void testMethod() throws Exception {
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Class<Student> aClass = (Class<Student>) Class.forName("com.zz.classdemo.Student");
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//1.获取方法
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// 获取取clazz对应类中的所有方法--方法数组（一）
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// 不能获取private方法,并且获取从父类继承来的所有方法
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Method[] methods = aClass.getMethods();
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for (Method method:methods) {
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System.out.println(method);
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}
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System.out.println("================================");
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//2.获取方法
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// 获取取clazz对应类中的所有方法--方法数组（一）
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// 不能获取private方法,不获取从父类继承来的所有方法
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Method[] declaredMethods = aClass.getDeclaredMethods();
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for (Method method:declaredMethods) {
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System.out.println(method);
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}
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System.out.println("=================================");
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// 1.3.获取指定的方法
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// 需要参数名称和参数列表，无参则不需要写
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// 对于方法public void setName(String name) { }
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Method method = aClass.getDeclaredMethod("setName", String.class);
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System.out.println(method);
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// 而对于方法public void setAge(int age) { }
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method = aClass.getDeclaredMethod("setAge", Integer.class);
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System.out.println(method);
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// 这样写是获取不到的，如果方法的参数类型是int型
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// 如果方法用于反射，那么要么int类型写成Integer： public void setAge(Integer age) { }
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// 要么获取方法的参数写成int.class
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//2.执行方法
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// invoke第一个参数表示执行哪个对象的方法，剩下的参数是执行方法时需要传入的参数
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Object obje = aClass.newInstance();
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method.invoke(obje,2);
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//如果一个方法是私有方法，第三步是可以获取到的，但是这一步却不能执行
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//私有方法的执行，必须在调用invoke之前加上一句method.setAccessible（true）;
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}
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/**
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* 把类对象和类方法名作为参数，执行方法
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*
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* 把全类名和方法名作为参数，执行方法
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* 可变参数可以放数组
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* @param obj: 方法执行的那个对象.
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* @param methodName: 类的一个方法的方法名. 该方法也可能是私有方法.
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* @param args: 调用该方法需要传入的参数
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* @return: 调用方法后的返回值
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*
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*/
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public Object invoke(Object obj, String methodName, Object ... args) throws Exception{
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//1. 获取 Method 对象
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// 因为getMethod的参数为Class列表类型，所以要把参数args转化为对应的Class类型。
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Class [] parameterTypes = new Class[args.length];
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for(int i = 0; i < args.length; i++){
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parameterTypes[i] = args[i].getClass();
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System.out.println(parameterTypes[i]);
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}
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Method method = obj.getClass().getDeclaredMethod(methodName, parameterTypes);
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//如果使用getDeclaredMethod，就不能获取父类方法，如果使用getMethod，就不能获取私有方法
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//
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//2. 执行 Method 方法
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//3. 返回方法的返回值
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return method.invoke(obj, args);
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}
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public static void testField() throws Exception {
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Class<Student> aClass = (Class<Student>) Class.forName("com.zz.classdemo.Student");
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//1.获取字段
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// 1.1 获取所有字段 -- 字段数组
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// 可以获取公用和私有的所有字段，但不能获取父类字段
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Field[] declaredFields = aClass.getDeclaredFields();
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for (Field field:declaredFields) {
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System.out.println(field);
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}
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System.out.println("=============================");
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// 1.2获取指定字段
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Field field = aClass.getDeclaredField("name");
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System.out.println(field.getName());
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System.out.println("==============================");
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Student student = new Student();
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//如果字段是私有的，不管是读值还是写值，都必须先调用setAccessible（true）方法
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field.setAccessible(true);
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student.setAge(1);
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student.setName("张三");
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//2.使用字段
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// 2.1获取指定对象的指定字段的值
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Object o = field.get(student);
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System.out.println(o);
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System.out.println("==========================");
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// 2.2设置指定对象的指定对象Field值
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field.set(student, "DEF");
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System.out.println(student.getName());
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}
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public static void testConstructor() throws Exception{
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Class<Student> aClass = (Class<Student>) Class.forName("com.zz.classdemo.Student");
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//1. 获取 Constructor 对象
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// 1.1 获取全部
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Constructor<?>[] constructors = aClass.getConstructors();
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for (Constructor constructor:constructors) {
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System.out.println(constructor);
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}
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System.out.println("============================");
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// 1.2获取某一个，需要参数列表
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Constructor<Student> constructor = aClass.getConstructor(String.class, Integer.class);
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System.out.println(constructor);
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System.out.println("============================");
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//2. 调用构造器的 newInstance() 方法创建对象
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Object obj = constructor.newInstance("zhagn", 1);
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}
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}
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package com.zz.classdemo;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/25$ 21:45$
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*/
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public class Test2 {
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public static void main(String[] args) {
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ClassDTO dto=new ClassDTO();
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dto.setName("java10班");
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dto.setStudents("[{name:\"张三\",age:21},{name:\"李四\",age:81}]");
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}
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}
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package com.zz.proxy;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/23$ 21:11$
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*/
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// 委托类
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public class HelloService implements IHelloService {
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@Override
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public String sayHello(String userName) {
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System.out.println(userName + " hello");
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return userName + " hello";
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}
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@Override
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public String sayByeBye(String userName) {
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System.out.println(userName + " ByeBye");
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return userName + " ByeBye";
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}
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}
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@ -0,0 +1,25 @@
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package com.zz.proxy;
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/**
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* @Description: java类作用描述
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* @Author: Bsea
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* @CreateDate: 2019/9/23$ 21:10$
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*/
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// 委托类接口
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public interface IHelloService {
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/**
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* 方法1
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* @param userName
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* @return
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*/
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String sayHello(String userName);
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/**
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* 方法2
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* @param userName
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* @return
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*/
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String sayByeBye(String userName);
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}
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package com.zz.proxy;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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/**
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||||
* @Description: java类作用描述
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||||
* @Author: Bsea
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||||
* @CreateDate: 2019/9/23$ 21:11$
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*/
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// 中间类
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public class JavaProxyInvocationHandler implements InvocationHandler {
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/**
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* 中间类持有委托类对象的引用,这里会构成一种静态代理关系
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*/
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private Object obj ;
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||||
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||||
/**
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* 有参构造器,传入委托类的对象
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* @param obj 委托类的对象
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*/
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public JavaProxyInvocationHandler(Object obj){
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this.obj = obj;
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}
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/**
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* 动态生成代理类对象,Proxy.newProxyInstance
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* @return 返回代理类的实例
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||||
*/
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public Object newProxyInstance() {
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||||
return Proxy.newProxyInstance(
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||||
//指定代理对象的类加载器
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||||
obj.getClass().getClassLoader(),
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||||
//代理对象需要实现的接口，可以同时指定多个接口
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obj.getClass().getInterfaces(),
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//方法调用的实际处理者，代理对象的方法调用都会转发到这里
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this);
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||||
}
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||||
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/**
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*
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||||
* @param proxy 代理对象
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||||
* @param method 代理方法
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* @param args 方法的参数
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* @return
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* @throws Throwable
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*/
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@Override
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||||
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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System.out.println("invoke before");
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||||
Object result = method.invoke(obj, args);
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||||
System.out.println("invoke after");
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||||
return result;
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||||
}
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||||
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// @Override
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||||
// public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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// return null;
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||||
// }
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||||
}
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|
|
@ -0,0 +1,18 @@
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|||
package com.zz.proxy;
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||||
|
||||
/**
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||||
* @Description: java类作用描述
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||||
* @Author: Bsea
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||||
* @CreateDate: 2019/9/23$ 21:12$
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||||
*/
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// 测试动态代理类
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||||
public class MainJavaProxy {
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||||
public static void main(String[] args) {
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JavaProxyInvocationHandler proxyInvocationHandler = new JavaProxyInvocationHandler(new HelloService());
|
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IHelloService helloService = (IHelloService) proxyInvocationHandler.newProxyInstance();
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helloService.sayByeBye("allen");
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||||
helloService.sayHello("jerry");
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}
|
||||
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||||
}
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||||
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|
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@ -0,0 +1,18 @@
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|||
package com.zz.thread;
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||||
|
||||
/**
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||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
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||||
* @CreateDate: 2019/9/21$ 19:14$
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||||
*/
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||||
public class A implements Runnable {
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Count count;
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public A(Count count99){
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this.count=count99;
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||||
}
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||||
@Override
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||||
public void run() {
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count.t1();
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||||
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||||
}
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}
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|
|
@ -0,0 +1,25 @@
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package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 19:14$
|
||||
*/
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||||
public class B implements Runnable {
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||||
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||||
Count count;
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||||
public B(Count count55){
|
||||
this.count=count55;
|
||||
}
|
||||
|
||||
|
||||
@Override
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||||
public void run() {
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||||
try {
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||||
Thread.sleep(5000);
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||||
this.count.t2();
|
||||
} catch (InterruptedException e) {
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||||
e.printStackTrace();
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||||
}
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||||
}
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||||
}
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||||
|
|
@ -0,0 +1,49 @@
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|||
package com.zz.thread;
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||||
|
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/**
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||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
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||||
* @CreateDate: 2019/9/21$ 16:52$
|
||||
*/
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public class Count {
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public int balance=1000;
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public String name;
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||||
public int getBalance(){
|
||||
return this.balance;
|
||||
}
|
||||
public void reduce(int num) {
|
||||
synchronized(this) {
|
||||
if(num<=this.balance){
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||||
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||||
System.out.println("成功取出：" + num);
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||||
try {
|
||||
Thread.sleep(3000);
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||||
} catch (InterruptedException e) {
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||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
this.balance = this.balance - num;
|
||||
}
|
||||
}
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||||
|
||||
}
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||||
|
||||
|
||||
public synchronized void t1(){
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||||
System.out.println("进入t1方法");
|
||||
try {
|
||||
wait();
|
||||
System.out.println("t1方法被叫醒");
|
||||
} catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
public synchronized void t2(){
|
||||
notifyAll();
|
||||
|
||||
}
|
||||
}
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||||
|
|
@ -0,0 +1,17 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:16$
|
||||
*/
|
||||
public class Demo1 implements Runnable{
|
||||
@Override
|
||||
public void run() {
|
||||
// System.out.println("run方法里面就是一个线程需要执行的任务");
|
||||
for(int i=0;i<2000;i++){
|
||||
System.out.println("**********demo1运行**********");
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:16$
|
||||
*/
|
||||
public class Demo2 implements Runnable{
|
||||
@Override
|
||||
public void run() {
|
||||
// System.out.println("run方法里面就是一个线程需要执行的任务");
|
||||
for(int i=0;i<2000;i++){
|
||||
System.out.println("@@@@@@@@@@@@demo2运行**********");
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
package com.zz.thread;
|
||||
|
||||
import java.util.Date;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:40$
|
||||
*/
|
||||
public class Demo3 implements Runnable{
|
||||
@Override
|
||||
public void run() {
|
||||
try {
|
||||
System.out.println("开始"+new Date());
|
||||
//让当前线程睡3秒后执行
|
||||
Thread.sleep(3000);
|
||||
System.out.println("结束"+new Date());
|
||||
} catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,21 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:16$
|
||||
*/
|
||||
public class Demo4 implements Runnable{
|
||||
Task task;
|
||||
public Demo4(Task task){
|
||||
this.task=task;
|
||||
}
|
||||
@Override
|
||||
public void run() {
|
||||
// System.out.println("run方法里面就是一个线程需要执行的任务");
|
||||
for(int i=0;i<300;i++){
|
||||
this.task.finishtask();
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,21 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:16$
|
||||
*/
|
||||
public class Demo5 implements Runnable{
|
||||
Task task;
|
||||
public Demo5(Task task){
|
||||
this.task=task;
|
||||
}
|
||||
@Override
|
||||
public void run() {
|
||||
// System.out.println("run方法里面就是一个线程需要执行的任务");
|
||||
for(int i=0;i<300;i++){
|
||||
this.task.finishtask();
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 16:04$
|
||||
*/
|
||||
public class Demo6 extends Thread {
|
||||
|
||||
public void run(){
|
||||
System.out.println("线程demo6 运行");
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 16:55$
|
||||
*/
|
||||
public class T1 extends Thread {
|
||||
Count count;
|
||||
T1(Count c){
|
||||
this.count=c;
|
||||
}
|
||||
|
||||
public void run(){
|
||||
count.reduce(1000);
|
||||
|
||||
System.out.println(count.getBalance());
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:50$
|
||||
*/
|
||||
public class Task {
|
||||
int total=600;
|
||||
int runtime=0;
|
||||
|
||||
public void finishtask(){
|
||||
//相当于this.total=this.total-1
|
||||
this.total--;
|
||||
this.runtime++;
|
||||
System.out.println("total="+total+"****runtime="+runtime);
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/20$ 21:21$
|
||||
*/
|
||||
public class Test {
|
||||
|
||||
public static void main(String[] args) {
|
||||
// Demo1 demo1=new Demo1();
|
||||
// Thread t1=new Thread(demo1);
|
||||
// //启动一个线程是执行start方法
|
||||
// t1.start();
|
||||
//
|
||||
// Demo2 demo2=new Demo2();
|
||||
// Thread t2=new Thread(demo2);
|
||||
// t2.start();
|
||||
|
||||
Task task=new Task();
|
||||
|
||||
Demo4 demo4=new Demo4(task);
|
||||
Thread t2=new Thread(demo4);
|
||||
t2.start();
|
||||
|
||||
Demo5 demo5=new Demo5(task);
|
||||
Thread t3=new Thread(demo5);
|
||||
t3.start();
|
||||
|
||||
System.out.println("执行次数"+task.runtime);
|
||||
System.out.println("任务总数"+task.total);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 16:07$
|
||||
*/
|
||||
public class Test2 {
|
||||
|
||||
public static void main(String[] args) {
|
||||
Demo6 demo6=new Demo6();
|
||||
demo6.start();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,18 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 16:58$
|
||||
*/
|
||||
public class Test3 {
|
||||
public static void main(String[] args) {
|
||||
Count count=new Count();
|
||||
|
||||
T1 t1=new T1(count);
|
||||
T1 t2=new T1(count);
|
||||
|
||||
t1.start();
|
||||
t2.start();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,21 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 19:21$
|
||||
*/
|
||||
public class Test4 {
|
||||
|
||||
public static void main(String[] args) {
|
||||
Count count2=new Count();
|
||||
|
||||
A a1=new A(count2);
|
||||
B b=new B(count2);
|
||||
|
||||
Thread t1=new Thread(a1);
|
||||
Thread t2=new Thread(b);
|
||||
t1.start();
|
||||
t2.start();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
package com.zz.thread;
|
||||
|
||||
/**
|
||||
* @Description: java类作用描述
|
||||
* @Author: Bsea
|
||||
* @CreateDate: 2019/9/21$ 20:35$
|
||||
*/
|
||||
public class Test5 {
|
||||
|
||||
public static void main(String[] args) {
|
||||
Test5 test5=new Test5();
|
||||
Thread t1=new Thread(
|
||||
new Runnable(){
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
test5.t1();
|
||||
}
|
||||
}
|
||||
);
|
||||
|
||||
Thread t2=new Thread(
|
||||
new Runnable(){
|
||||
|
||||
@Override
|
||||
public void run() {
|
||||
test5.t2();
|
||||
}
|
||||
}
|
||||
);
|
||||
|
||||
t1.start();
|
||||
t2.start();
|
||||
};
|
||||
public synchronized void t1(){
|
||||
try {
|
||||
System.out.println("开始等待");
|
||||
wait();
|
||||
System.out.println("被叫醒");
|
||||
} catch (InterruptedException e) {
|
||||
e.printStackTrace();
|
||||
}
|
||||
}
|
||||
|
||||
public synchronized void t2(){
|
||||
System.out.println("开始叫醒");
|
||||
notify();
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue