初学者Java（循环） - 缺少返回语句 [英] Beginners Java (Loops) - Missing return statement

问题描述

import java.util.Scanner;

public class Vending {
    public double vend(double balance) {
        Scanner in = new Scanner(System.in);
        balance = 0;
        System.out.print("Enter a command = ");
        String command = in.nextLine();

        while (in.hasNext()) {
            if (command.equals("penny")) {
                balance = balance + 0.01;
                System.out.println("balance = " + balance);
            }
            return balance;
        }
    }
}

嗨！我已经尝试了一切来弄清楚为什么不能识别return语句。如果我把返回余额放在其他任何地方，它说system.out.println是无法访问的......你们中的任何人都可以帮助我，为什么这可能不起作用？谢谢!!

Hi! I have tried everything to figure out why the return statement is not being recognized. If I put the "return balance" anywhere else it says that the system.out.println is unreachable... Can any of you kindly help me out as to why this may not be working?? Thank you!!

推荐答案

return 语句在 while 循环并且在 if 条件段之外，所以代码在第一次迭代时打破循环。

The return statement is inside the while loop and outside the if condition segment, so the code its breaking the loop on the first iteration.

可能的解决方案：在之外移动返回，而

Possible solution: move the return outside the while

while (in.hasNext()) {
    if (command.equals("penny")) {
        balance = balance + 0.01;
        System.out.println("balance = " + balance);
    }
}
return balance;

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