56 主子线程循环执行
public class Demo { public static Object o = new Object(); public static boolean flag = true; public static void main(String[] args) { Thread sub = new Thread(new Sub()); sub.start(); mainRun(); } public static void mainRun() { try { for (int i = 1; i <= 5; i++) { mainExec(i); Thread.sleep(1000); } } catch (Exception e) { e.printStackTrace(); } } public static void mainExec(int num) throws Exception { synchronized (o) { if (flag) { o.wait(); } for (int i = 1; i <= 20; i++) { System.out.println(String.format("main-第%s次--%s", num + "", i + "")); } flag = true; o.notify(); } } static class Sub extends Thread { public void run() { try { for (int i = 1; i <= 5; i++) { subExec(i); Thread.sleep(1000); } } catch (Exception e) { e.printStackTrace(); } } public void subExec(int num) throws Exception { synchronized (o) { if (!flag) { o.wait(); } for (int i = 1; i <= 10; i++) { System.out.println(String.format("sub-第%s次--%s", num + "", i + "")); } flag = false; o.notify(); } } } }