所以我有一些带有扫描器的 Java 代码。当我收到错误时,我做错了什么。
// Creates a "scanner" for the input
Scanner readInput = new Scanner(System.in);
// Print out random integer and open close message.
System.out.println("Printing Random Numbers between 1-200: ");
int guess = readInput.nextInt();
错误(我对 Java 还很陌生,我的代码有点像 4-5 年前。但忘记了):
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at java.util.Scanner.nextInt(Unknown Source)
at main.files.mian.main(mian.java:30)
最佳答案
如果您输入数字(整数)以外的任何内容,您的程序将崩溃。以下代码检查是否能够将输入转换为 int。如果是,则一切正常,否则错误将是 printet,但程序不会崩溃。
// Creates a "scanner" for the input
Scanner readInput = new Scanner(System.in);
// Print out random integer and open close message.
System.out.println("Printing Random Numbers between 1-200: ");
try {
int guess = readInput.nextInt();
} catch (InputMismatchException e) {
System.err.println("You didn't enter a number.");
}
关于java - 这个扫描仪有什么问题吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18173928/