先上代码
新建一个Thread,代码如下:
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package com.thread.test;
public class MyThread extends Thread {
private String name;
public MyThread(String name) {
this .name = name;
}
@Override
public void run() {
for ( int i = 0 ; i < 100 ; i++) {
System.out.println(name+ "[" +i+ "]" );
}
super .run();
}
}
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之后新建测试类,代码如下:
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package com.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
*/
public class ThreadDemo{
public static void main(String[] args) {
MyThread t = new MyThread( "A" );
t.start();
for ( int i = 0 ; i < 100 ; i++) {
if (i> 50 ) {
try {
t.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println( "主线程" + "[" +i+ "]" );
}
}
}
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下面是Java Platform SE8 API中对Thread中Join方法的解释:
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public final void join( long millis)
throws InterruptedExceptionWaits at most millis milliseconds for this thread to die. A timeout of 0 means to wait forever.
This implementation uses a loop of this .wait calls conditioned on this .isAlive. As a thread terminates the this .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 - if the value of millis is negative
InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.
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先上代码
新建一个Thread,代码如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
package com.thread.test;
public class MyThread extends Thread {
private String name;
public MyThread(String name) {
this .name = name;
}
@Override
public void run() {
for ( int i = 0 ; i < 100 ; i++) {
System.out.println(name+ "[" +i+ "]" );
}
super .run();
}
}
|
之后新建测试类,代码如下:
1
2
3
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5
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package com.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
*/
public class ThreadDemo{
public static void main(String[] args) {
MyThread t = new MyThread( "A" );
t.start();
for ( int i = 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:
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public final void join( long millis)
throws InterruptedExceptionWaits at most millis milliseconds for this thread to die. A timeout of 0 means to wait forever.
This implementation uses a loop of this .wait calls conditioned on this .isAlive. As a thread terminates the this .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 - if the value of millis is negative
InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.
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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。
原文链接:http://www.cnblogs.com/Miracle-Maker/archive/2017/01/08/6261738.html