switch.java

北京邮电大学牛导的 JAVA课件课件及相关资料

import javax.swing.JApplet;
import javax.swing.JOptionPane;
import java.awt.Graphics;
public class Switch extends JApplet {
    
   public void paint(Graphics g) {
       int choice,counter,input;
       String inputchoice;
       super.paint(g);
       inputchoice = JOptionPane.showInputDialog("输入你的选择");
       choice = Integer.parseInt(inputchoice);
       switch (choice)
       {
        case 1:
            for(counter = 0; counter<10; counter++)
                g.drawLine(25, 25, 100, 25+counter*10);
                break;
        case 2:
            for(counter = 0; counter <10; counter ++)
                g.drawRect(25+counter*10, 25+counter*10, 50*(counter+1), 50*(counter+1));
                break;                   
        case 3:
            for(counter = 0; counter <10; counter++)
                g.drawOval(25+counter*5, 25+counter*5, 10*(counter+1), 10*(counter+1));
                break;
        default:
               g.drawString(" 无效的输入",25,25);
       }
       
    }
    
}