java - 扫描仪仅读取第一组输入

Question

这是我开发的代码，用于按 block 分隔输入(当到达空格时):

import java.util.Scanner;
public class Single {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("Three Numbers:");
        String numbers = in.next();
        int length = numbers.length();
        System.out.println(length);
        int sub = length - length;
        System.out.println(sub);
        System.out.println(getNumber(numbers, length, sub));
        System.out.println(getNumber(numbers, length, sub));
        System.out.println(getNumber(numbers, length, sub));
    }
    public static double getNumber(String numbers, int length, int sub){
        boolean gotNumber = false;
        String currentString = null;
        while (gotNumber == false){
            if (numbers.substring(sub, sub + 1) == " "){
                sub = sub + 1;
                gotNumber = true;
            } else {
                currentString = currentString + numbers.substring(sub, sub);
                sub = sub + 1;
            }
        }
        return Double.parseDouble(currentString);
    }
}

但是，它只读取字符串的第一组，而忽略其余部分。我该如何解决这个问题？

Answer 1

问题就出在这里。您应该替换此行

String numbers = in.next();

用这一行

String numbers = in.nextLine();

因为，next() 只能读取输入直到第一个空格，而nextLine() 可以读取输入直到换行 字符。欲了解更多信息，请查看this link .