JAVA怎么判断指定的进程当前是否在运行

data2=null;

改为实例化一个新对象.

比如你的数组

就是data2 =new Array();(根据你的需要)

这样肯定就有区别了.因为当你的data为空时候.在reload中可能会有判断.为null不加重.但是你现在不是null了.但是长度是零.所以应该是会有变化的..

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

class StreamDrainer implements Runnable {

private InputStream ins;

public StreamDrainer(InputStream ins) {

this.ins = ins;

}

public void run() {

try {

BufferedReader reader = new BufferedReader(new InputStreamReader(

ins));

String line = null;

while ((line = reader.readLine()) != null) {

//这判断你的进程

if(line.indexOf("QQ.exe")!=-1){

System.out.println("有QQ");

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

}

public class TestRunCmd {

public static void main(String[] args) {

String[] cmd = new String[] { "cmd.exe", "/C", "wmic process get name" };

try {

Process process = Runtime.getRuntime().exec(cmd);

new Thread(new StreamDrainer(process.getInputStream())).start();

new Thread(new StreamDrainer(process.getErrorStream())).start();

process.getOutputStream().close();

} catch (Exception e) {

e.printStackTrace();

}

}我爱编程网

}

试试这样，我用的线程来做，你改run方法里面的进程名就好了

判断是否在运行用isAlive方法哈。。

给你写了个例子。。不知是不是你想要的。。

public class Thread100 {

/**

* @param args

*/

public static ThreadA ta = new ThreadA();

public static ThreadB tb = new ThreadB();

public static void main(String[] args) {

ta.start();

tb.start();

}

}

class ThreadA extends Thread {

@Override

public void run() {

int i = 0;

while(i < 100) {

if(Thread100.tb.isAlive()) {

System.out.println("B is alive");

}

System.out.println(i);

i++;

}

}

}

class ThreadB extends Thread {

@Override

public void run() {

int i = 0;

while(i < 100) {

if(Thread100.ta.isAlive()) {

System.out.println("A is alive");

}

System.out.println(i);

i++;

}

}

}