Java多线程中关于join方法的使用实例解析
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2024-03-08 13:19:40
先上代码
新建一个thread,代码如下:
package com.thread.test;
public class mythread extends th...
先上代码
新建一个thread,代码如下:
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:
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:
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.
先上代码
新建一个thread,代码如下:
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:
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:
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.
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。