Java 实例 - 查看线程是否存活

以下实例演示了如何通过继承 Thread 类并使用 isAlive() 方法来检测一个线程是否存活：

TwoThreadAlive.java 文件

public   class   TwoThreadAlive   extends   Thread   {
    public   void   run ( )   {
       for   ( int   i  =  0 ;  i  <  10 ;  i ++ )   {
          printMsg ( ) ;
       }
    }

    public   void   printMsg ( )   {
       Thread   t  =  Thread . currentThread ( ) ;
       String   name  =  t . getName ( ) ;
       System . out . println ( " name= "  +  name ) ;
    }

    public   static   void   main ( String [ ]   args )   {
       TwoThreadAlive   tt  =  new   TwoThreadAlive ( ) ;
       tt . setName ( " Thread " ) ;
       System . out . println ( " before start(), tt.isAlive()= "  +  tt . isAlive ( ) ) ;
       tt . start ( ) ;
       System . out . println ( " just after start(), tt.isAlive()= "  +  tt . isAlive ( ) ) ;
       for   ( int   i  =  0 ;  i  <  10 ;  i ++ )   {
          tt . printMsg ( ) ;
       }
       System . out . println ( " The end of main(), tt.isAlive()= "  +  tt . isAlive ( ) ) ;
    }
}

以上代码运行输出结果为：

before start(), tt.isAlive()=false

just after start(), tt.isAlive()=true

name=main

name=Thread

name=main

name=main

name=main

name=main

name=main

name=main

name=main

name=main

name=main

name=Thread

name=Thread

name=Thread

name=Thread

name=Thread

The end of main(), tt.isAlive()=true

name=Thread

name=Thread

name=Thread

name=Thread

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[这个贴子最后由 flybird 在 2020-01-26 16:54:45 重新编辑]

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