【阿楚の帖】测试题：以下代码运行会有问题吗？
以下代码运行有问题吗？如果在文本框中输入非1、2、3的数运行会怎样？
import java.awt.Graphics;
import javax.swing.*;
public class SwitchTest extends JApplet
{
int choice;
public void init()
{
String input;
input=JOptionPane.showInputDialog("Enter 1 to draw lines\n"+"Enter 2 to draw rectangles\n"+"Enter 3 to draw ovals\n");
choice=Integer.parseInt(input);
}
public void paint(Graphics g)
{
for(int i=0;i<10;i++)
{
switch(choice)
{
case 1:
g.drawLine(10,10,250,10+i*10);break;
case 2:
g.drawRect(10+i*10,10+i*10,50+i*10,50+i*10);break;
case 3:
g.drawOval(10+i*10,10+i*10,50+i*10,50+i*10);break;
default:
JOptionPane.showMessageDialog(null,"Invalid value entered");break;
}//end switch
}//end for
}//end paint()
}//end class SwitchTest
