java为什么要打印这个输出，似乎不合适

Question

//Question4 
correct = false;
System.out.println("how many feet are in a yard?");
while (!correct)
{
    x1 = input.nextInt();
    if (x1==3)
    {
        System.out.println("correct.");
        correct = true;
    }
    else
    {
        System.out.println("incorrect. try again.");
    }
}


    //Question5
correct = false;
System.out.println("What gets wetter and wetter the more it dries?");
while (correct == false)
{

   s1 = input.nextLine();
   if (s1.equalsIgnoreCase("a towel")) // cheating is bad!
    {
        System.out.println("correct");
        correct = true;
    }

    else
    {
        System.out.println("incorrect. try again.");
    }
}

输出 一码有多少英尺？ 3. 对的 什么东西越干越湿？ 不正确。再试一次甚至在请求用户输入之前打印

Answer 1

把你的第一个问题改成这样：

while (!correct)
{
    x1 = input.nextInt();
    input.nextLine(); //NEW CODE
    if (x1==3)
    {
        System.out.println("correct.");
        correct = true;
    }
    else
    {
        System.out.println("incorrect. try again.");
    }
}

你必须总是在nextInt()之后做nextLine()。换行符没有被nextInt()吞没，因此下面的nextLine()吞没了它，而不是你想要的