import java.util.Scanner;
public class Area 
{
    public static void main(String[] args) 
    {
        int a=(int)(Math.random()*100);//隨機函數
        int answer = 110;
        do
        {
        System.out.print("請猜一個數:");
        Scanner input=new Scanner(System.in);
        answer=input.nextInt();
            if(a==answer)
                    System.out.print("您終於猜對了");
        else if(a>answer)
            System.out.print("您猜的數字偏低!\n");
        else if(a<answer)
            System.out.print("您猜的數字偏高!\n");
        }while(a!=answer);       
    } 
}
 

java編程利用隨機函數在1~100內（範圍可替換）猜數字