如何从数组中选择指定索引以在交换情况下使用它

Question

嗨，我是初学者，我想做一个测验数学游戏，我怎么能选择一个指定索引的随机数组，并使用它作为大小写值。

Random random=new Random();
int num1= random.nextInt(30);
int num2= random.nextInt(30);

System.out.println(num1+"+"+num2+"=");
int result=num1+num2;

System.out.println("What is the answer of this operation?");

int sugg1=random.nextInt(100);
int sugg2=random.nextInt(100);

int[] array = {sugg1,sugg2,result};

Random rand = new Random();

for (int i = 0; i < array.length; i++) {
int randomIndexToSwap = rand.nextInt(array.length);

int temp = array[randomIndexToSwap];

array[randomIndexToSwap] = array[i];

array[i] = temp;
}
System.out.println(Arrays.toString(array));
switch (Arrays.toString(array)) {
//I NEED HELP HERE HOW CAN I SELECT A SPECIFY INDEX OF THE RANDOM ARRAY AND USE IT AS CASE VALUE
case array:

}

Answer 1

您可以使用switch(array[yourIndex]){case element: ...}

Answer 2

我不太明白你想做什么。

值版本:

// Print for example [14,21,30] if question is 10+11
System.out.println(Arrays.toString(array));
// You want the user to select the answer
System.out.print("Please type the good answer : ");
Scanner scan = new Scanner(System.in);
switch(scan.nextInt()){
case result:
System.out.println("Good answer!");
break;
default:
System.out.printtln("Bad answer!");
}

索引版本:

// Print for example [14,21,30] if question is 10+11
System.out.println(Arrays.toString(array));
// You want the user to select the answer index
System.out.print("Please type the good answer : ");
Scanner scan = new Scanner(System.in);
int index = scan.nextInt();
if(index >= 0 && index <= array.length) {
switch(array[index]){
case result:
System.out.println("Good answer!");
break;
default:
System.out.printtln("Bad answer!");
}
} else {
System.out.println("Selected index does not exist in the array");
}

顺便说一下，如果sugg1!=sugg2!=answer可能是好的，因为在下面的代码中，值不是不可能相同:

int sugg1=random.nextInt(100);
int sugg2=random.nextInt(100);
int[] array = {sugg1,sugg2,result};