mouseeventdemo.java

180个针对Java初学者的简单实例,包含了180個適合與初學者的源碼實例

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MouseEventDemo extends JFrame
implements MouseListener,MouseMotionListener{
  String strPosition,strAction;
  DisplayPanel panel=new DisplayPanel();
  public MouseEventDemo()   {
    super("鼠标事件");
    setSize(260,200);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //注册鼠标事件监听器
    addMouseListener(this);
    addMouseMotionListener(this);
    this.getContentPane().add(panel); // 将显示面板添加到框架窗口中
    panel.init();
  }
  public static void main(String[] args)   {
    MouseEventDemo frame = new MouseEventDemo();
    frame.show();
  }
  public void mouseClicked(MouseEvent e) {
    strAction="单击鼠标";
    panel.tfAction.setText(strAction);
  }
  public void mousePressed(MouseEvent e) {
    strAction="按下鼠标键";
    panel.tfAction.setText(strAction);
  }
  public void mouseReleased(MouseEvent e) {
    //用户松开鼠标键调用此方法
  }
  public void mouseEntered(MouseEvent e) {
    //鼠标进入此窗口调用此方法
  }
  public void mouseExited(MouseEvent e) {
    //鼠标退出此窗口调用此方法
  }
  public void mouseDragged(MouseEvent e) {
    //按下鼠标键并移动鼠标时调用此方法
  }
  public void mouseMoved(MouseEvent e) {
    strPosition="X坐标："+e.getX();
    strPosition+="  Y坐标:"+e.getY();
    panel.tfPosition.setText(strPosition);
  }
}
//创建显示面板
class DisplayPanel extends JPanel{
  JLabel lbPosition,lbAction;
  JTextField tfPosition,tfAction;
  //创建网格包布局管理器对象
   GridBagLayout Layout;
   GridBagConstraints con;
  public void init(){//此函数用于创建各组件对象并添加到面板中
    Layout=new GridBagLayout();
    con=new GridBagConstraints();
    this.setLayout(Layout);
    lbPosition=new JLabel("鼠标位置");
    lbAction=new JLabel("鼠标动作");
    tfPosition=new JTextField();
    tfAction=new JTextField();
    //设置网格包布局
    con.anchor=GridBagConstraints.CENTER;
    con.fill=GridBagConstraints.HORIZONTAL;
    //添加组件到面板
    addComponent(this,Layout,con,lbPosition,0,0,1,1,20,0);
    addComponent(this,Layout,con,lbAction,0,1,1,1,20,0);
    addComponent(this,Layout,con,tfPosition,1,0,1,1,80,100);
    addComponent(this,Layout,con,tfAction,1,1,1,1,80,100);
  }
  //添加组件到面板
  private void addComponent(JPanel panel,GridBagLayout Layout,
         GridBagConstraints gbc,Component com,int row,int column,
                      int numRows,int numColumns,int Weightx,int Weighty){
   gbc.gridx=row;
   gbc.gridy=column;
   gbc.gridwidth=numRows;
   gbc.gridheight=numColumns;
   gbc.weightx=Weightx;
   gbc.weighty=Weighty;
   Layout.setConstraints(com,gbc);
   panel.add(com);
 }
}