?? painterdemo.java
字號(hào):
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class PainterDemo extends JFrame{
JToggleButton[] button=new JToggleButton[3]; //按鈕組
PainterPanel painter=new PainterPanel(); //繪圖面板
public PainterDemo(){
super("Java畫(huà)圖程序"); //調(diào)用父類(lèi)構(gòu)造函數(shù)
String[] buttonName={"直線","橢圓","矩形"}; //按鈕文字
DrawShapeListener buttonListener=new DrawShapeListener(); //按鈕事件
JToolBar toolBar=new JToolBar(); //實(shí)例化工具欄
ButtonGroup buttonGroup=new ButtonGroup(); //實(shí)例化按鈕組
for (int i=0;i<button.length;i++){
button[i]=new JToggleButton(buttonName[i]); //實(shí)例化按鈕
button[i].addActionListener(buttonListener); //增加按鈕事件處理
buttonGroup.add(button[i]); //增加按鈕到按鈕組
toolBar.add(button[i]); //增加按鈕到工具欄
}
Container container=getContentPane(); //得到窗口容器
container.add(toolBar,BorderLayout.NORTH); //增加組件到容器上
container.add(painter,BorderLayout.CENTER);
setSize(300,200); //設(shè)置窗口尺寸
setVisible(true); //設(shè)置窗口為可視
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //關(guān)閉窗口時(shí)退出程序
}
class DrawShapeListener implements ActionListener{ //按鈕事件處理
public void actionPerformed(ActionEvent e){
for (int i=0;i<button.length;i++){
if (e.getSource()==button[i]){ //判斷來(lái)自于哪個(gè)按鈕
painter.drawShape(i); //繪制圖形
}
}
}
}
public static void main(String[] args){
new PainterDemo();
}
}
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