当我在JTextArea中按Enter时，我想使用Key Listener进行监听，但是它不起作用

Question

I made a JTextArea with a new Key Listener with this line in my class SetUp:

startWin is from my Window class, and text is the JTextArea object in that class

StrToInt is a method that converts a string to an int without using the parse methods

        startWin.text.addKeyListener(new KeyListener() {

        int s;
        @Override
        public void keyPressed(KeyEvent e) {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e) {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyTyped(KeyEvent e) {

            if(e.getKeyCode() == KeyEvent.VK_ENTER){
            start = setup.StrToInt(startWin.text.getText()); //start is static
        }

        }
    });
    s = start;
    return s;

My goal was to input a value in text, and press enter to return it and store it to start.

Yet when I do this:

public void Maze(Window w) {
    int start = 0;

    w = setup.StartWindow(w);
    while (start == 0) {
        start = setup.Start(w);
    }
}

I get a runtime error. What am I doing wrong? thanks

Answer 1

I looked and saw one problem with your "int s;" (was outside of method before)

  int s;
  startWin.text.addKeyListener(new KeyListener() {


    @Override
    public void keyPressed(KeyEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyReleased(KeyEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyTyped(KeyEvent e) {

        if(e.getKeyCode() == KeyEvent.VK_ENTER){
        start = setup.StrToInt(startWin.text.getText()); //start is static
        s = start;
    }

    }
});
  return s;