程序代码:
public static void main(String[] args) {
Test t = new Test();
new Thread(t, "测试线程1").start();
new Thread(t, "测试线程2").start();
}
public void run() {
for (int i = 0; i < 5; i++) {
/* synchronized(thread) {*/
if (i == 2) {
System.out.println(Thread.currentThread().getName() + "i=2");
try {
System.out.println("线程" + Thread.currentThread().getName() + "被挂起!");
wait();
System.out.println("线程" + Thread.currentThread().getName() + "解除!");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (i == 1) {
System.out.println(Thread.currentThread().getName() + "i=1");
notify();
System.out.println("解除挂起");
}
if (i == 4) {
System.out.println(Thread.currentThread().getName() + "i=4");
notify();
System.out.println("解除挂起");
}
}
}
运行结果:
测试线程1i=1Exception in thread "测试线程1" Exception in thread "测试线程2"
测试线程2i=1
java.lang.IllegalMonitorStateException
at java.lang.Object.notify(Native Method)
at com.test.Test.run(Test.java:27)
at java.lang.Thread.run(Thread.java:748)
java.lang.IllegalMonitorStateException
at java.lang.Object.notify(Native Method)
at com.test.Test.run(Test.java:27)
at java.lang.Thread.run(Thread.java:748)
产生原因:当所有线程都被挂起wait()后,程序无法继续进行而报的异常