我正在创建一个考试程序,测试答案存储在一个数组中,用户的答案存储在一个单独的数组中。
我正在尝试编写我的程序,以便在每个问题之后将用户的答案加载到数组中,除非他们输入的不是“A
”、“B
” "、"C
"或 "D
"。如果他们没有输入这些值之一,那么将再次询问该问题。我很困惑。
这是我的代码:
String[] testAnswers = {"B","D","A","A","C","A","B","A","C","D"};
int uT = testAnswers.length;
String[] userAnswers = new String[uT];
for (int i=0; i<uT;i++) {
System.out.print("Question #"+(i+1)+": ");
userAnswers[i] = in.nextLine();
userAnswers[i] = userAnswers[i].toUpperCase();
}
我尝试创建一个数组列表,然后使用 if 循环再次询问 Q。问题是我对 ArrayLists 不是很熟悉。
for (int i=0; i<uT;i++) {
System.out.print("Question #"+(i+1)+": ");
userAnswers[i] = in.nextLine();
userAnswers[i] = userAnswers[i].toUpperCase();
List<String> list = Arrays.asList(userAnswers);
while (!list.contains("A") || !list.contains("B") || !list.contains("C")
|| !list.contains("D")) {
System.out.println("Invalid Input. ");
System.out.print("Question #"+(i+1)+": ");
userAnswers[i] = in.nextLine();
userAnswers[i] = userAnswers[i].toUpperCase();
}
}
我尝试过的另一件事是使用 boolean 变量和/或使用 do/while 循环,但我似乎无法弄清楚该怎么做。我认为是因为我将 userInput
直接放入数组中才破坏了我的代码。
boolean isValid = true;
do {
for (int i=0; i<uT;i++) {
System.out.print("Question #"+(i+1)+": ");
isValid = false;
userAnswers[i] = in.nextLine();
userAnswers[i] = userAnswers[i].toUpperCase();
try {
//something here
}
...
最佳答案
使用 while 循环,仅在输入正确时递增
String[] testAnswers = {"B","D","A","A","C","A","B","A","C","D"};
int uT = testAnswers.length;
String[] userAnswers = new String[uT];
int i = 0;
while(i<uT) {
System.out.print("Question #"+(i+1)+": ");
String input = in.nextLine();
input = input.toUpperCase();
if (input.equals ("A") || input.equals ("B") ...) {
userAnswers[i] = input;
i++;
}
else {
System.out.println ("Enter again");
}
}
关于java - 验证来自添加到数组中的扫描仪的用户输入,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52846441/