直接上题
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class MyMouseAdapter{
public static void main(String args[]) {
new MyFrame("drawing...");
}
}class MyFrame extends Frame {
ArrayList points = null;
MyFrame(String s) {
super(s);
points = new ArrayList();
setLayout(null);
setBounds(300,300,400,300);
this.setBackground(new Color(204,204,255));
setVisible(true);
this.addMouseListener(new Monitor());
}
public void paint(Graphics g) {
Iterator i = points.iterator();
while(i.hasNext()){
Point p = (Point)i.next();
g.setColor(Color.BLUE);
g.fillOval(p.x,p.y,10,10);
}
}
public void addPoint(Point p){
points.add(p);
}
}class Monitor extends MouseAdapter {
public void mousePressed(MouseEvent e) {
MyFrame f = (MyFrame)e.getSource();
f.addPoint(new Point(e.getX(),e.getY()));
f.repaint();
}
}我机器上说他有错误 错误处在倒数第四行 为什么 怎么改
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class MyMouseAdapter{
public static void main(String args[]) {
new MyFrame("drawing...");
}
}class MyFrame extends Frame {
ArrayList points = null;
MyFrame(String s) {
super(s);
points = new ArrayList();
setLayout(null);
setBounds(300,300,400,300);
this.setBackground(new Color(204,204,255));
setVisible(true);
this.addMouseListener(new Monitor());
}
public void paint(Graphics g) {
Iterator i = points.iterator();
while(i.hasNext()){
Point p = (Point)i.next();
g.setColor(Color.BLUE);
g.fillOval(p.x,p.y,10,10);
}
}
public void addPoint(Point p){
points.add(p);
}
}class Monitor extends MouseAdapter {
public void mousePressed(MouseEvent e) {
MyFrame f = (MyFrame)e.getSource();
f.addPoint(new Point(e.getX(),e.getY()));
f.repaint();
}
}我机器上说他有错误 错误处在倒数第四行 为什么 怎么改
看下你的jdk版本
或者直接上异常信息
import java.awt.event.*;
import java.util.*;
public class MyMouseAdapter{
public static void main(String args[]) {
new MyFrame("drawing...");
}
}@SuppressWarnings("serial")
class MyFrame extends Frame {
@SuppressWarnings("unchecked")
ArrayList points = null;
@SuppressWarnings("unchecked")
MyFrame(String s) {
super(s);
points = new ArrayList();
setLayout(null);
setBounds(300,300,400,300);
this.setBackground(new Color(204,204,255));
setVisible(true);
this.addMouseListener(new Monitor());
} @SuppressWarnings("unchecked")
public void paint(Graphics g) {
Iterator i = points.iterator();
while(i.hasNext()){
Point p = (Point)i.next();
g.setColor(Color.BLUE);
g.fillOval(p.x,p.y,10,10);
}
} @SuppressWarnings("unchecked")
public void addPoint(Point p){
points.add(p);
}
}class Monitor extends MouseAdapter {
public void mousePressed(MouseEvent e) {
MyFrame f = (MyFrame)e.getSource();
f.addPoint(new Point(e.getX(),e.getY()));
f.repaint();
}
}在我机子上没问题,可以话出来一个框点击可以出来一些点啊~~(可惜不能把结果给你粘进来~)
它说的是找不到符号
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});