如何将鼠标放在它上面时移动按钮

Question

我有一个带有两个按钮的Jframe：“是”和“否”。我想在每次用户将鼠标放在它上面时移动“是”按钮，这样用户将永远在“追逐”它。

下面的代码：

import java.awt.*; 
import java.awt.BorderLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.awt.event.MouseEvent; 
import javax.swing.*; 
// import javax.swing.JLabel; 
// import javax.swing.JPanel; 

public class BeachPartyPrimerFrame extends JFrame 
{ 
    private JPanel mousePanel; // panel in which mouse events will occur 
    private JLabel statusBar; // label that displays event information 
    private JLabel Party, study; 
    private JButton YesButton, Yes2Button, NoButton; 
    private int locx []= {200, 100, 500, 200}; 
    private int locy [] = {20, 200, 200, 300}; 
    private int count = 0; 
    private int mod = 4; 


    private boolean nobuttonhit = false; 
    // MouseTrackerFrame constructor sets up GUI and 
    // registers mouse event handlers 
    public BeachPartyPrimerFrame() 
    { 
     super("Demonstrating Mouse Events"); 

     mousePanel = new JPanel(); // create panel 
     mousePanel.setBackground(Color.WHITE); // set background color 
     mousePanel.setLayout(null); 
     add(mousePanel, BorderLayout.CENTER); // add panel to JFrame 
     statusBar = new JLabel("Mouse outside JPanel"); 
     add(statusBar, BorderLayout.SOUTH); // add label to JFrame 
     Party = new JLabel ("Do you want Beach party right now?"); 
     add (Party, BorderLayout.NORTH); 
     study = new JLabel ("Great! Keep studying hard!!"); 
     study.setVisible(false); 
     study.setFont(new Font("Serif",Font.PLAIN, 24)); 
     study.setForeground(Color.RED); 
     study.setSize(400,80); 
     study.setLocation(100,200); 
     YesButton = new JButton ("Yes"); 
     YesButton.setSize (60,40); 
     YesButton.setLocation(200, 20); 


     NoButton = new JButton ("No"); 
     NoButton.setSize(60,40); 
     NoButton.setLocation (320, 20); 
     ButtonHandler bhandler = new ButtonHandler(); 
     YesButton.addActionListener (bhandler); 
     NoButton.addActionListener(bhandler); 

     mousePanel.add(YesButton); 
     mousePanel.add(NoButton); 
     mousePanel.add(study); 

     // create and register listener for mouse and mouse motion events 
     MouseHandler handler = new MouseHandler(); 
     mousePanel.addMouseListener(handler); 
     mousePanel.addMouseMotionListener(handler); 


    } // end MouseTrackerFrame constructor 
    public void hideButtons() { 
     System.out.println ("Try to hide buttons"); 
     YesButton.setVisible(false); 
    } 
    private class ButtonHandler implements ActionListener 
    { 
     // handle button event 
     public void actionPerformed(ActionEvent event) 
     { 

     if (event.getActionCommand() == "No") { 
      System.out.println ("No button hit"); 

     } 

     else { 
      System.out.println ("Yes button pressed"); 
      YesButton.setLocation(YesButton.getX(), 
        YesButton.getY() + 60); 
     } 
     } // end method actionPerformed 
    } // end private inner class ButtonHandler 
    private class MouseHandler implements MouseListener, 
     MouseMotionListener 
    { 
     // MouseListener event handlers 
     // handle event when mouse released immediately after press 
     public void mouseClicked(MouseEvent event) 
     { 
     statusBar.setText(String.format("Clicked at [%d, %d]", 
      event.getX(), event.getY())); 
     if (event.isMetaDown()) 
      System.out.println("Right button clicked"); 
     else 
      System.out.println("Left button clicked"); 

     } // end method mouseClicked 

     // handle event when mouse pressed 
     public void mousePressed(MouseEvent event) 
     { 
     statusBar.setText(String.format("Pressed at [%d, %d]", 
      event.getX(), event.getY())); 
     } // end method mousePressed 

     // handle event when mouse released after dragging 
     public void mouseReleased(MouseEvent event) 
     { 
     statusBar.setText(String.format("Released at [%d, %d]", 
      event.getX(), event.getY())); 
     } // end method mouseReleased 

     // handle event when mouse enters area 
     public void mouseEntered(MouseEvent event) 
     { 
     statusBar.setText(String.format("Mouse entered at [%d, %d]", 
      event.getX(), event.getY())); 
     mousePanel.setBackground(new Color (255, 255,0)); 
     } // end method mouseEntered 

     // handle event when mouse exits area 
     public void mouseExited(MouseEvent event) 
     { 
     statusBar.setText("Mouse outside JPanel"); 
     mousePanel.setBackground(Color.WHITE); 
     } // end method mouseExited 

     // MouseMotionListener event handlers 
     // handle event when user drags mouse with button pressed 
     public void mouseDragged(MouseEvent event) 
     { 
     statusBar.setText(String.format("Dragged at [%d, %d]", 
      event.getX(), event.getY())); 
     } // end method mouseDragged 

     // handle event when user moves mouse 
     public void mouseMoved(MouseEvent event) 
     { 


     statusBar.setText(String.format("Moved at [%d, %d]", 
      event.getX(), event.getY())); 

     } // end method mouseMoved 
    } // end inner class MouseHandler 
} // end class MouseTrackerFrame 

而这里的驱动程序类：

import javax.swing.JFrame; 
public class BeachPartyPrimer 
{ 
    public static void main(String args[]) 
    { 
     BeachPartyPrimerFrame mouseTrackerFrame = new BeachPartyPrimerFrame(); 
     mouseTrackerFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     mouseTrackerFrame.setSize(600, 400); // set frame size 
     mouseTrackerFrame.setVisible(true); // display frame 
    } // end main 
} // end class MouseTracker 

下面是它的外观像一个截图：

目前，如果我点击“Yes “，按钮向下移动一点点：

但正如我所说的，我想改变这种情况，使用户总是追逐它。

Answer 1

您可以将MouseListener添加到您的YesButton。重写mouseEntered方法，并设置一个随机位置，以您的按钮：

YesButton.addMouseListener(new MouseAdapter() { 
     public void mouseEntered(java.awt.event.MouseEvent evt) { 
      YesButton.setLocation(new Random().nextInt(600), new Random().nextInt(400)); 
     } 
    }); 

我在创建范围内的随机位置x和y600和400（你的窗口大小），当然，你可以调整它。