线程联合：
一个线程A在占用CPU资源期间，可以让其它线程调用join()方法和本线程联合，B.join();称为A在运行期间联合的B。联合后A线程立刻中止执行，一直等到它联合的线程B执行完毕，线程A再重新排队等候。如果A准备联合的B已经结束，那么B.join()不会产生任何效果。
public class JoinThread implements Runnable {
Thread threadA, threadB;
String content[] = { "今天晚上", "大家不要", "回去得太早", "还有工作需要大家做!" };
public JoinThread() {
threadA = new Thread(this);
threadB = new Thread(this);
threadB.setName("经理");
}
public void run() {
if (Thread.currentThread() == threadA) {
System.out.println("我等" + threadB.getName() + "说完我再说!");
try {
threadB.join();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("\n我开始说话了,我明白你的意思了,谢谢!");
} else {
try {
System.out.println(threadB.getName() + "说:");
for (int i = 0; i < content.length; i++) {
System.out.println(content[i]);
threadB.sleep(1000);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
public class TestJoinThread {
public TestJoinThread() {
}
public static void main(String[] args) {
JoinThread test = new JoinThread();
test.threadA.start();
test.threadB.start();
}
}
