ACM Java库(GraphicsProgram)中的getElementAt(double x，double y)等效于Java是什么? [英] What is java eqivalent for getElementAt(double x, double y) from acm java Libraries(GraphicsProgram);

问题描述

在Java中，我尝试使用容器类中的getComponentAt(x，y)方法.但是对于给定的(x，y)坐标，即使(x，y)包含某些图像/JLabel/JButton，它也总是返回给我javax.swing.JRootPane类的对象.

in java i tried using getComponentAt(x, y) method from container class. but for given (x,y) co ordinates it is always returning me object of class javax.swing.JRootPane even if (x,y) contains some image/JLabel/JButton.

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class temp2 implements MouseListener{
    public static void main(String[] arg){
        frame = new JFrame("adsa");
        frame.setBounds(0, 0, 1000, 1000);
        frame.setVisible(true);
        frame.addMouseListener(new temp2());
        JButton l = new JButton("asdasd");
        frame.add(l);
        l.addMouseListener(new temp2());;
    }
    static JFrame frame;
    @Override
    public void mouseClicked(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();
            System.out.println(frame.getComponentAt(x, y).getClass());
        System.out.println(frame.getComponentAt(x, y) instanceof JButton);

    }
    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }

}

这是我用于测试的示例代码. 每当我单击按钮时，我都会得到以下输出:

this is the sample code i used for testing.. whenever i click on button i am getting following output:

class javax.swing.JRootPane 
false

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