Question

用java编写程序，读取键盘输入的字符并将其显示到鼠标所指的位置。

Answer 1

import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

public class Demo1 extends JFrame implements 

MouseMotionListener,KeyListener,MouseListener {

private JPanel content;

private JPanel bottom;

private JLabel show;

static String keyCode="";

public Demo1(){

content=new JPanel();

content.setLayout(null);

show=new JLabel(); 

show.setForeground(Color.white);

bottom=new JPanel();

content.setBounds(0, 0, 800, 600);

content.setBackground(Color.black);

content.add(show);

content.setFocusable(true);

content.addKeyListener(this);

content.addMouseMotionListener(this);

content.addMouseListener(this);

setTitle

("读取键盘输入的字符并将其显示到鼠标所指的位置");

setSize(800, 600);

setLocationRelativeTo(getOwner());

add(content);

add(bottom);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

}

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

keyCode+=String.valueOf((char)e.getKeyCode());

}

@Override

public void keyReleased(KeyEvent e) {

// TODO Auto-generated method stub

}

@Override

public void keyTyped(KeyEvent e) {

// TODO Auto-generated method stub

}

public static void main(String[] args) {

new Demo1();

}

@Override

public void mouseDragged(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseMoved(MouseEvent e) {

// TODO Auto-generated method stub

if(keyCode!=""){

show.setText(keyCode);

show.setBounds(e.getX()+20, e.getY(), 800, 30);

}

}

@Override

public void mouseClicked(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

keyCode="";

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

}

}