JAVA写的这个图形为什么不能显示
package org.paint;
import java.awt.*;
import java.util.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import javax.swing.*;
public class Paint extends JFrame implements ActionListener {
private JRadioButton jradiobutton_round,jradiobutton_rectangle;
private JLabel jlabel_width,jlabel_length,jlabel_cir,jlabel_area;
private JTextField text_width,text_length,text_cir,text_area;
private JButton button_paint;
private JPanel jpanel1,jpanel2,jpanel3;
private RoundPaint roundpaint;
public Paint()
{
super("绘制平面图形并计算周长和面积");
Dimension dim =getToolkit().getScreenSize(); //获得分辨率
this.setBounds(dim.width/4,dim.height/4,dim.width/2,dim.height/2);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setBackground(java.awt.Color.lightGray);
jradiobutton_round =new JRadioButton("圆形");
jradiobutton_rectangle = new JRadioButton("矩形");
ButtonGroup bgp = new ButtonGroup();
bgp.add(jradiobutton_round);
bgp.add(jradiobutton_rectangle);
jradiobutton_round.setSelected(true);
jlabel_width = new JLabel("宽度");
jlabel_length = new JLabel("长度");
text_length = new JTextField(10);
text_width = new JTextField(10);
button_paint = new JButton("绘图");
button_paint.addActionListener(this);
jpanel1 = new JPanel();
jpanel1.setLayout(new FlowLayout(FlowLayout.LEFT));
jpanel1.add(jradiobutton_rectangle);
jpanel1.add(jradiobutton_round);
jpanel1.add(jlabel_length);
jpanel1.add(text_length);
jpanel1.add(jlabel_width);
jpanel1.add(text_width);
jpanel1.add(button_paint);
roundpaint = new RoundPaint();
//jpanel2 = new JPanel();
// jpanel2.add(roundpaint);
// jpanel2.add(new JLabel("rrr"));
this.getContentPane().add(roundpaint,BorderLayout.CENTER);
jlabel_cir = new JLabel("周长");
text_cir = new JTextField(10);
jlabel_area = new JLabel("面积");
text_area = new JTextField(10);
jpanel3 = new JPanel();
jpanel3.setLayout(new FlowLayout(FlowLayout.CENTER));
jpanel3.add(jlabel_cir);
jpanel3.add(text_cir);
jpanel3.add(jlabel_area);
jpanel3.add(text_area);
//this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(jpanel1,BorderLayout.NORTH);
this.getContentPane().add(jpanel3,BorderLayout.SOUTH);
this.setVisible(true);
}
public void actionPerformed(ActionEvent arg0) {
double a,b,cir,area;
try{
a = Double.parseDouble(text_length.getText());
b = Double.parseDouble(text_width.getText());
if(jradiobutton_rectangle.isSelected())
{
cir = 2*(a+b);
area = a*b;
}
else
{
cir = Math.PI*(1.5*(a+b)-Math.sqrt(a*b));
area =a*b*Math.PI;
}
text_cir.setText(""+cir);
text_area.setText(""+area);
roundpaint.repaint();
}
catch(Exception e)
{
}
finally
{
}
}
public static void main(String[] args) {
new Paint();
}
class RoundPaint extends Canvas implements ComponentListener
{
public RoundPaint()
{
this.addComponentListener(this);
}
public void paint(Graphics g)
{
try{
if(jradiobutton_round.isSelected())
g.fillRect(this.getWidth()/2, this.getHeight()/2,Integer.parseInt(text_width.getText()) , Integer.parseInt(text_length.getText()));
else
g.fillOval(this.getWidth()/2, this.getHeight()/2,Integer.parseInt(text_width.getText()) , Integer.parseInt(text_length.getText()));
}
catch(Exception e)
{
}
finally
{
}
}
public void componentResized(ComponentEvent e)
{
this.repaint();
}
public void componentMoved(ComponentEvent e){}
public void componentShown(ComponentEvent e){}
public void componentHidden(ComponentEvent e){}
}
}
这个该怎么改？？
[解决办法]
帮顶吧
[解决办法]
LS的，你编译过吗？
[解决办法]
第一 楼主这个是可以画图的
第二有可能你没有看到 那就改下面这两个地方
if(jradiobutton_round.isSelected())
g.fillRect(0, 0,Integer.parseInt(text_width.getText()) , Integer.parseInt(text_length.getText()));
else
g.fillOval(0,0,Integer.parseInt(text_width.getText()) , Integer.parseInt(text_length.getText()));
}
