輸入n種口味隨機輸出四種不同的口味！

#用到了一個Random的類。

import java.util.Random;

public class GetIceCream {

public static void main(String[] args) {

String[] iceCream = new String[] { "香蕉", "草莓", "香芋", "巧克力", "奶油", "咖啡" };//可以換成不同數量的口味

String[] getIceCream = getIce(iceCream);

System.out.println();

System.out.print("隨機四種口味: ");

for (int i = 0; i < getIceCream.length; i++) {

System.out.print(getIceCream[i] + " ");

}

}

 

public static String[] getIce(String[] iceCream) {

String[] getIceCream = new String[4];

boolean[] autoGet = new boolean[6];// 創建使用狀態

Random rand = new Random();// 隨機取下標

 

for (int num = 0; num < getIceCream.length; num++) {

int a = rand.nextInt(autoGet.length);

if (!autoGet[a]) {//判斷是否爲false，如果爲true，則退回上一個，再循環

getIceCream[num] = iceCream[a];

// System.out.print(a+" ");

autoGet[a] = true;// 選中的改爲true

} else { //銜接上方

num--;

}

}

 

// 獲取什麼口味沒被選中

for (

 

int i = 0; i < autoGet.length; i++) {

System.out.print(iceCream[i] + " ");

System.out.print(autoGet[i] + " ");

}

return getIceCream;

}

}