隨機函式產生100以內的數，5次機會。

import javax.swing.*;
public class Hello{
    public static void main(String[] args){
	int i = (int)(Math.random()*101);
	int n = 0;
	int a[] = new int [5];
	for(n = 0;n〈=5;n++)
	{
		if(n==5)
			JOptionPane.showMessageDialog(null,"錯，沒機會了。");
		else
		{
			String str = JOptionPane.showInputDialog("請猜一個100以內的整數：");
			a[n] = Integer.parseInt(str);
			if(i>a[n])
			{
				JOptionPane.showMessageDialog(null,"錯，太小，繼續");
			}
			else if(i〈a[n])
			{
				JOptionPane.showMessageDialog(null,"錯，太大，繼續");
			}
			else if(i==a[n])
			{
				JOptionPane.showMessageDialog(null,"你真厲害！");
				break;
			}
		}
	}
}
}