如何在ActionListener中调用另一个Java文件？

Question

I am creating a graphical interface for my program. When I press the start button, I want it to call another program.

Below is my listerner code:

private class ButtonHandler implements ActionListener 
{
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==startButton)
            ?????
    }
}

What should I do? I intend to call another Java file (Start.java).

Answer 1

If you want to create a new Start instance there, you could do that:

public void actionPerformed(ActionEvent e)
{
    if(e.getSource()==startButton) {
       Start myStart = new Start();
       myStart.foo();
    }
}

Or if you already have a reference to an existing Start object, then simply call its methods. A caveat, if any of Start's methods take a long time to complete or are resource hogs, you'll want to do them in a background thread such as supplied by a SwingWorker object.

Note that my answer is quite general and perhaps a bit vague on the details, but I cannot supply any finer grained details until you tell us a lot more about the structure of your program, your classes, and your specific problem here.

Answer 2

You can call the required method of Start class if this belongs to your project and is already included in class path.

If you want to launch another process alltogether you have to use http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#exec(java.lang.String )