Synchronized可重入性解釋

Synchronized可重入性解釋：

自己可以再次獲取自己的內部鎖。

Public class Service{
Synchronized public void service1(){
System.out.println(“service1”);
Service2();
}

Synchronized public void service2(){
System.out.println(“service2”);
Serice3();
}

Synchronized public void service3(){
System.out.println(“service3”);
}
}

通過調用Service.service1()方法可以直接輸出

 

Service1

Service2

Service3

 

另外可重入鎖也可以在繼承父類的子類中使用

Main：

public class Main {
	public int i=10;
	synchronized public void operateMainMethod() {
		try {
			i--;
			System.out.println("main print i="+i);
			Thread.sleep(100);
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
}

Sub:

public class Sub extends Main {
	synchronized public void operateISubMethod() {
		try {
			while(i>0) {
				i--;
				System.out.println("sub print i="+i);
				Thread.sleep(100);
				this.operateMainMethod();
			}
		} catch (Exception e) {
			// TODO: handle exception
		}
	}
}

MyThread:

public class MyThread extends Thread{
	@Override
	public void run() {
		// TODO Auto-generated method stub
		super.run();
		Sub sub=new Sub();
		sub.operateISubMethod();
	}

}

Run:

public class Run {
	public static void main(String[] args) {
		MyThread thread=new MyThread();
		thread.start();
	}
}