Java Thread中， join() 方法主要是让调用改方法的thread完成run方法里面的东西后， 在执行join()方法后面的代码。示例：
- class ThreadTesterA implements Runnable {
- private int counter;
- @Override
- public void run() {
- while (counter <= 10) {
- System.out.print("Counter = " + counter + " ");
- counter++;
- }
- System.out.println();
- }
- }
- class ThreadTesterB implements Runnable {
- private int i;
- @Override
- public void run() {
- while (i <= 10) {
- System.out.print("i = " + i + " ");
- i++;
- }
- System.out.println();
- }
- }
- public class ThreadTester {
- public static void main(String[] args) throws InterruptedException {
- Thread t1 = new Thread(new ThreadTesterA());
- Thread t2 = new Thread(new ThreadTesterB());
- t1.start();
- t1.join(); // wait t1 to be finished
- t2.start();
- t2.join(); // in this program, this may be removed
- }
- }
如果去掉t1.join()这个语句过后， 输出的书序是乱的， 加上这个语句过后， 就会按照顺序输出， 从某种意义上说实现了同步。
转自：http://auguslee.iteye.com/blog/1292203