Thread对象 既传入了Runnable对象又重写了run()方法

    @Override
    public void run() {
        if (target != null) {
            target.run();
        }
    }

public class StringTest {
    private static int a;
    private static int b;
    public static void main(String[] args) {
        a = 1;
        b = 1;
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {

                }
                while (a < 5) {
                    System.out.println("a=" + a);
                    a++;
                    b--;
                }
            }
        }) {
            public void run() {
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {

                }
                while (b < 5) {
                    System.out.println("b=" + b);
                    b++;
                    a--;
                }
            };
        }.start();
    }
}