「java程序改错总结」Java程序改错
今天给各位分享java程序改错总结的知识，其中也会对Java程序改错进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
- 1、简单java程序改错！
- 2、java程序改错
- 3、JAVA程序改错
- 4、java程序改错问题，要求有原因。
简单java程序改错！
分类: 电脑/网络 程序设计 其他编程语言
问题描述:
本程序要实现的是随着鼠标点击，将在画布上话小方块。
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.awt.geom.*;
import javax.swing.*;
public class MouseTest
{
public static void main(String[] args)
{
MouseFrame frame=new MouseFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
}
class MouseFrame extends JFrame
{
public MouseFrame()
{
setTitle("MouseTest");
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
MousePanel panel=new MousePanel();
Container contentPane=getContentPane();
contentPane.add(panel);
}
public static final int DEFAULT_WIDTH=300;
public static final int DEFAULT_HEIGHT=200;
}
class MousePanel extends JPanel
{
public MousePanel()
{
squares=new ArrayList();
current=null;
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionHandler());
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
g2.setPaint(Color.RED);
for(int i=0;isquares.size();i++)
g2.draw((Rectangle2D)squares.get(i));
}
public Rectangle2D find(Point2D p)
{
for(int i=0;isquares.size();i++)
{
Rectangle2D r=(Rectangle2D)squares.get(i);
if(r.contains(p)) return r;
}
return null;
}
public void add(Point2D p)
{
double x=p.getX();
double y=p.getY();
current=new Rectangle2D.Double(x-SIDELENGTH/2,y-SIDELENGTH/2,SIDELENGTH,SIDELENGTH);
squares.add(current);
repaint();
}
public void remove(Rectangle2D s)
{
if(s==null)return;
if(s==current) current=null;
squares.remove(s);
repaint();
}
private static final int SIDELENGTH=10;
private ArrayList squares;
private Rectangle2D current;
private class MouseHandler extends MouseAdapter
{
public void mouseHandler(MouseEvent event)
{
current=find(event.getPoint());
if(current==null)
add(event.getPoint());
}
public void mouseClicked(MouseEvent event)
{
current=find(event.getPoint());
if(current==nullevent.getClickCount()=2)
remove(current);
}
}
private class MouseMotionHandler implements MouseMotionListener
{
public void mouseMoved(MouseEvent event)
{
if(find(event.getPoint())==null)
setCursor(Cursor.getDefaultCursor());
else
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
}
public void mouseDragged(MouseEvent event)
{
if (current!=null)
{
int x=event.getX();
int y=event.getY();
current.setFrame(x-SIDELENGTH/2,y-SIDELENGTH/2,SIDELENGTH,SIDELENGTH);
repaint();
}
}
}
}
解析:
这地方是改错的，不是给你实现功能的，哈哈
java程序改错
System.out.println("Result is :"+ newArray);
改为
System.out.print("Result is :");
for（int i=0 ; inewArray.length; i++）{
System.out.print("" + newArray[i] );
}
JAVA程序改错
对可能出错的方法进行条件判断。修改方式如下：
class Test {
public int aaa(int x, int y) {
int result = 0;
// 判断
if (y == 0) {
System.out.println("分母不能为零");
} else {
result = x / y;
}
return result;
}
}
public class TestException {
public static void main(String[] args) {
int result = new Test().aaa(3, 0);
System.out.println("result," + result);
}
}
运行结果：
java程序改错问题，要求有原因。
class Human 改为public class Human，保存到Human.java中；
public class Student保存到Student.java中
java程序改错总结的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于Java程序改错、java程序改错总结的信息别忘了在本站进行查找喔。