Java Process isAlive() 方法

2024年11月2日 | 阅读 1 分钟

isAlive() 方法用于测试当前正在执行的进程是否处于活动状态。

语法

参数

不适用

isAlive() 方法返回两个值：true 或 false

如果由 Process 对象执行的进程尚未终止，则该方法返回 true。
如果由 Process 对象执行的进程已经终止，则该方法返回 false。

示例 1

public class Process_isAliveMethodExample1 {
        public static void main(String[] args) {   
  try{
           //A process is created. 
          System.out.println("A process is created:");
         Process p = Runtime.getRuntime().exec("mspaint.exe");
      //Waits for the process until you terminate.
        p.waitFor();
      //Tests whether the current process is alive or not.
       System.out.println(p.isAlive());
      //The process is closed manually.
     System.out.println("Manually closes the notepad.");
       //Finally the wait is over.
      System.out.println("Wait is completed.");
    }catch(Exception e)
     {
       System.out.println(e);
     }
  }}

输出

A process is created:
false
Manually closes the notepad.
Wait is completed.

示例 2

public class Process_isAliveMethodExample2 {
         public static void main(String[] args) {
    try{
          // At first Notepad is opened.
          System.out.println("Notepad will open");
          Process p1=Runtime.getRuntime().exec("notepad.exe");
        // Waits for the process p1 to terminate.
         p1.waitFor();
      //Tests whether the process p1 is alive.
        System.out.println(p1.isAlive());
     //After that notepad is opened.
         System.out.println("Ms paint will open");
         Process p2=Runtime.getRuntime().exec("mspaint.exe");
    //Again waits for the process to terminate. 
         p2.waitFor();
  // Tests whether the process p2 is alive.
        System.out.println(p2.isAlive());
      }catch(Exception e)
    {
        System.out.println("Ohho! an exception has occurred: ");
    }
  }
} 

输出

Notepad will open
false
Ms paint will open
False

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Java Process isAlive() 方法

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Java Process isAlive() 方法

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