import java.awt.*;
import java.awt.event.*;

public class Test {
    public static void main(String args[]) {
        new Win();
    }
}

class Win extends Frame {
    Button button;
    TextField textf;
    TextArea texta;
    MouseL ml;
    Win() {
        setLayout(new FlowLayout());
        button = new Button("Button");
        textf = new TextField(8);
        texta = new TextArea();
        button.addMouseListener(ml);
        textf.addMouseListener(ml);
        texta.addMouseListener(ml);
        add(button);
        add(textf);
        add(texta);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        pack();
        setVisible(true);
        validate();
    }
}

class MouseL extends MouseAdapter {
    Win win;
    public MouseL(Win win) {
        this.win = win;
    }
    
    public void mousePressed(MouseEvent e) {
        /*
        if(e.getSource() == win.button) {
            win.texta.append("mouse clicked on Button. Position: " + "(" + e.getX() + "," + e.getY() + ").");
        }
        if(e.getSource() == win.textf) {
            win.texta.append("mouse clicked on TextField. Position: " + "(" + e.getX() + "," + e.getY() + ").");
        }
        if(e.getSource() == win.texta) {
            win.texta.append("mouse clicked on TextArea. Position: " + "(" + e.getX() + "," + e.getY() + ").");
        }
        */
        System.out.println(e.getSource());
    }
}

addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

------解决方案--------------------
参看http://blog.csdn.net/gaowen_han/article/details/7170918以及http://blog.csdn.net/gaowen_han/article/details/7163755里面讲得很详细