java 多线程&锁重入支持继承的环境——27

锁重入也支持父子类继承的环境。

package chapter2.test2_1.test2_1_8;

public class Main {
    public int i = 10;

    synchronized public void operateIMainMethod() {
        try {
            i--;
            System.out.println("main print i=" + i);
            Thread.sleep(100);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

package chapter2.test2_1.test2_1_8;

public class Sub extends Main {
    synchronized public void operateISubMethod() {
        try {
            while (i > 0) {
                i--;
                System.out.println("sub print i=" + i);
                Thread.sleep(100);
                super.operateIMainMethod();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

package chapter2.test2_1.test2_1_8;

public class MyThread extends Thread {
    @Override
    public void run() {
        Sub sub = new Sub();
        sub.operateISubMethod();
    }
}

package chapter2.test2_1.test2_1_8;

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

此示例说明，当存在父子类继承关系时，子类是完全可以通过锁重入调用父类的同步方法 的