How to start and stop a Windows process from a Java program?

Question

Java

Tell me, please, how can I stop the Windows process from the program?
For example, with Runtime.getRuntime() I launch the Windows Calculator. By pressing the button again, I want to close it using the destroy() method of the Process class. But it doesn't close.

btnCalculator.addActionListener(new ActionListener() {

    @Override
    public void actionPerformed(ActionEvent arg0) {
      // TODO Auto-generated method stub
      if (!isWinCalc){	    //  если калькулятор не запущен		  
         try {
          procOfCalc = Runtime.getRuntime().exec("calc");  // procOfCalc  - переменная типа Process
         } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
         }
         isWinCalc = true;
      }
      else {
        procOfCalc.destroy();
         isWinCalc = false;
      }
    }
  });

Answer 1

Such garbage (indestructibility) is similar only with calc.exe. Notepad.exe and mspaint.exe stop fine!
Why?
All figured out!
Everything turned out to be simple: the Windows calculator file is called calc.exe, and the running process is called Calculator.exe.
And this is enough for the button to work normally:

btnCalculator.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent arg0) {
      // TODO Auto-generated method stub
            if (!isWinCalc){
            	try {
      Runtime.getRuntime().exec("C:/Windows/System32/calc.exe");
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
            	isWinCalc = true;
            }
            else {
            	try {
            		Runtime.getRuntime().exec("taskkill /F /IM Calculator.exe");
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
             	isWinCalc = false;
            }
  }
});

Answer 2

You can use the taskkill command :
Runtime.getRuntime().exec("taskkill calc /f");