同步代码块和同步方法

package cn.test.dxc.syc;

public class huizong {
    
    
    //同步方法默认用this或者当前类class对象作为锁
    public synchronized void methodA(){
    
    //默认当前对象
        for (int i = 0; i < 5; i++) {
    
    
            System.out.println(Thread.currentThread().getName()+"方法A愉快的打印了"+i);
            try {
    
    
                Thread.sleep(1000);
            } catch (InterruptedException e) {
    
    
                e.printStackTrace();
            }
        }
    }
    public void methodB(){
    
    //锁当前对象
        synchronized (this){
    
    
            for (int i = 0; i <5 ; i++) {
    
    
                System.out.println(Thread.currentThread().getName()+"方法B愉快的打印了"+i);
                try {
    
    
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
    
    
                    e.printStackTrace();
                }
            }

        }
    }

    public void methodC(){
    
    
        Object obj = new Object();//锁为自定义的对象
        synchronized (obj){
    
    
            for (int i = 0; i <5 ; i++) {
    
    
                System.out.println(Thread.currentThread().getName()+"方法C愉快的打印了"+i);
                try {
    
    
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
    
    
                    e.printStackTrace();
                }
            }
        }
    }
    public void methodD(){
    
    
        synchronized (huizong.class){
    
    //同步代码块用当前类信息对象
            for (int i = 0; i <5 ; i++) {
    
    
                System.out.println(Thread.currentThread().getName()+"方法D愉快的打印了"+i);
                try {
    
    
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
    
    
                    e.printStackTrace();
                }
            }

        }
    }
    public static synchronized  void methodE(){
    
    //默认当前的类信息对象
        for (int i = 0; i < 5; i++) {
    
    
            System.out.println(Thread.currentThread().getName()+"方法E愉快的打印了"+i);
            try {
    
    
                Thread.sleep(1000);
            } catch (InterruptedException e) {
    
    
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
    
    
        final huizong test = new huizong();
        Thread thread1 = new Thread(new Runnable() {
    
    
            @Override
            public void run() {
    
    
                test.methodA();
            }
        });
        thread1.start();


        Thread thread2 = new Thread(new Runnable() {
    
    
            @Override
            public void run() {
    
    
                test.methodB();
            }
        });
        thread2.start();

        Thread thread3 = new Thread(new Runnable() {
    
    
            @Override
            public void run() {
    
    
                test.methodC();
            }
        });
        thread3.start();


        Thread thread4 = new Thread(new Runnable() {
    
    
            @Override
            public void run() {
    
    
                test.methodD();
            }
        });
        thread4.start();

        Thread thread5 = new Thread(new Runnable() {
    
    
            @Override
            public void run() {
    
    
                test.methodA();
            }
        });
        thread5.start();

    }

}