java实现鼠标拖拽画矩形框
importjava.awt.*;importjavax.swing.*;importjava.awt.event.*;publicclassRectextendsJFr...
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Rect extends JFrame{
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Rect r=new Rect();
}
MyPanel mp=null;
public Rect()
{
mp=new MyPanel();
this.add(mp);
this.addMouseListener(mp);
//this.addMouseMotionListener(mp);
this.setSize(500,500);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class MyPanel extends JPanel implements MouseListener
{
int x1=0;
int y1=0;
int x2=0;
int y2=0;
public void paint(Graphics g)
{
super.paint(g);
g.drawRect(x1, y1, x2, y2);
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
x1=e.getX();
x2=e.getY();
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
x2=e.getX()-x1;
y2=e.getY()-y2;
this.repaint();
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
小弟谢了一个程序 编译过去了 但是报异常运行不了 请高手帮忙看看是哪出错了？ 展开
import javax.swing.*;
import java.awt.event.*;
public class Rect extends JFrame{
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Rect r=new Rect();
}
MyPanel mp=null;
public Rect()
{
mp=new MyPanel();
this.add(mp);
this.addMouseListener(mp);
//this.addMouseMotionListener(mp);
this.setSize(500,500);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
class MyPanel extends JPanel implements MouseListener
{
int x1=0;
int y1=0;
int x2=0;
int y2=0;
public void paint(Graphics g)
{
super.paint(g);
g.drawRect(x1, y1, x2, y2);
}
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
x1=e.getX();
x2=e.getY();
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
x2=e.getX()-x1;
y2=e.getY()-y2;
this.repaint();
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
小弟谢了一个程序 编译过去了 但是报异常运行不了 请高手帮忙看看是哪出错了？ 展开
1个回答
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JDK 版本<=5.0 时，少年把@Override去掉吧
程序没有错误 ，我的机子能运行
程序没有错误 ，我的机子能运行
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我的JDK是7.0吧应该是 去掉了也还是不行啊 顺便问一句 那个@代表什么什么内容 好像不是注释吧也
追答
@ 在Java中叫 注解 annotation ,一种特殊的注释
把运行时错误发出来。。。我的机子能运行
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