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详解Java多线程中关于join方法的使用实例
时间：2017-01-09 编辑：简简单单 来源：一聚教程网
先上代码
新建一个Thread,代码如下:
|
packagecom.thread.test;
publicclassMyThreadextendsThread {
privateString name;
publicMyThread(String name) {
this.name = name;
}
@Override
publicvoidrun() {
for(inti =0; i <100; i++) {
System.out.println(name+"["+i+"]");
}
super.run();
}
}
|
之后新建测试类,代码如下:
|
packagecom.thread.test;
/*
* 0-50执行的是主线程,50-100执行的是A线程,并且将A线程完全执行完后才继续执行主线程
*/
publicclassThreadDemo{
publicstaticvoidmain(String[] args) {
MyThread t =newMyThread("A");
t.start();
for(inti =0; i <100; i++) {
if(i>50) {
try{
t.join();
}catch(InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("主线程"+"["+i+"]");
}
}
}
|
下面是Java Platform SE8 API中对Thread中Join方法的解释:
|
publicfinalvoidjoin(longmillis)
throwsInterruptedExceptionWaits at most millis millisecondsforthisthread to die. A timeout of0means to wait forever.
This implementation uses a loop ofthis.wait calls conditioned onthis.isAlive. As a thread terminates thethis.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.
Parameters:
millis - the time to wait in milliseconds
Throws:
IllegalArgumentException -ifthe value of millis is negative
InterruptedException -ifany thread has interrupted the current thread. The interrupted status of the current thread is cleared whenthisexception is thrown.
|
先上代码
新建一个Thread,代码如下:
|
packagecom.thread.test;
publicclassMyThreadextendsThread {
privateString name;
publicMyThread(String name) {
this.name = name;
}
@Override
publicvoidrun() {
for(inti =0; i <100; i++) {
System.out.println(name+"["+i+"]");
}
super.run();
}
}
|
之后新建测试类,代码如下:
|
packagecom.thread.test;
/*
* 0-50执行的是主线程,50-100执行的是A线程,并且将A线程完全执行完后才继续执行主线程
*/
publicclassThreadDemo{
publicstaticvoidmain(String[] args) {
MyThread t =newMyThread("A");
t.start();
for(inti =0; i <100; i++) {
if(i>50) {
try{
t.join();
}catch(InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("主线程"+"["+i+"]");
}
}
}
|
下面是Java Platform SE8 API中对Thread中Join方法的解释:
|
publicfinalvoidjoin(longmillis)
throwsInterruptedExceptionWaits at most millis millisecondsforthisthread to die. A timeout of0means to wait forever.
This implementation uses a loop ofthis.wait calls conditioned onthis.isAlive. As a thread terminates thethis.notifyAll method is invoked. It is recommended that applications not use wait, notify, or notifyAll on Thread instances.
Parameters:
millis - the time to wait in milliseconds
Throws:
IllegalArgumentException -ifthe value of millis is negative
InterruptedException -ifany thread has interrupted the current thread. The interrupted status of the current thread is cleared whenthisexception is thrown.
|
我自己的理解就是会强行进入使用join方法的线程，其他线程等待该线程完全执行完后才会进来。
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