Java - 错误消息 InputMismatchException

Question

所以我正在为学校编写 Java 程序，我在 mac osx 上使用 Eclipse。当我运行程序时，它给了我这个错误：

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:864)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at Dank.main(Dank.java:13)

这是代码：

             import java.util.Scanner;
             public class Dank
           {
 static Scanner in = new Scanner(System.in);
 public static void main(String args[])
{
int antonio='0';
int answer;
System.out.print("Whats your name? ");
answer = in.nextInt();
if (answer == antonio) {
    System.out.println("are you sure? you are a Dank Meme "+answer);
}
else
{
        System.out.println("Damn, you aren't a Dank Meme "+answer);
}
  }
  }

Answer 1

in.nextInt() 只允许整数作为输入。所以如果你输入一个字符串，它会给你 inputmismatchexception。尝试将其更改为 in.nextLine()。你的情况早。它不会将 '0' 读为 0。程序将其读取为 '0' 的字符，因此它返回 48，因为您将其赋予了 int。尝试使用此代码。

 public class TestClass {


 static Scanner in = new Scanner(System.in);
public static void main(String args[])
{
String antonio = "0";
String answer;

System.out.print("Whats your name? ");
answer = in.nextLine();
if (answer .equalsIgnoreCase(antonio) ) {
System.out.println("are you sure? you are a Dank Meme "+answer);
}
else
{
 System.out.println("Damn, you aren't a Dank Meme "+answer);
}
}

}