程序代码：

import javax.swing.JOptionPane;

public class tss {


 /**
  * @param args
  */

 private static int tasklist1 = -1;
    public static void main(String[] args)
    {
       try {
         
       String cmd1 = "cmd.exe /c  tasklist";
       p =Runtime.getRuntime().exec(cmd1);
      StringBuffer out = new StringBuffer();
      byte[] b = new byte[1024];
      for (int n; (n = p.getInputStream().read(b)) != -1;) {
       out.append(new String(b, 0, n));
      }
      tasklist1=out.toString().indexOf("QQ.exe");//检查QQ进程
         } catch (Exception e1) {
       e1.printStackTrace();
      }
        
         if(tasklist1==-1){
         
         //程序在进程中没有发现
         }else{
          JOptionPane.showMessageDialog(null, "程序已经打开!", "警告", 1);
         }
    }

}

程序代码：

import import /**

 * JAVA检测指定的进程是否在运行。

 *

 * @author JAVA世纪网(, )

 */
public class hg {
  public static void main(String[] args) {
    System.out.println(findProcess("alg.exe"));
  }
  /**
   * 检测程序。
   *
   * @param processName 线程的名字，请使用准确的名字
   * @return 找到返回true,没找到返回false
   */
  public static boolean findProcess(String alg.exe)) {
    BufferedReader bufferedReader = null;
    try {
      Process proc = Runtime.getRuntime().exec("tasklist /FI \"IMAGENAME eq " + processName + "\"");
      bufferedReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));
      String line = null;
      while ((line = bufferedReader.readLine()) != null) {
        if (line.contains(processName)) {
          return true;
        }
      }
      return false;
    } catch (Exception ex) {
      ex.printStackTrace();
      return false;
    } finally {
      if (bufferedReader != null) {
        try {
          bufferedReader.close();
        } catch (Exception ex) {}
      }
    }
  }
}