交替打印ABAB

最简单的join方法

public class Test {
    public static void main(String[] args) throws InterruptedException{
        for(int i = 0; i < 50; i ++){
            Thread threadA = new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.print("A");
                }
            });
            threadA.start();
            threadA.join(0);
            Thread threadB = new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.print("B");
                }
            });
            threadB.start();
            threadB.join(0);
        }
    }

}

https://blog.51cto.com/u_13544/6425126