java - 不使用数组获取 N 个输入的最大值

Question

我正在努力寻找 N 值的最大输入。我能够打印最大值，但练习要求仅打印最大值，并且我无法从 IF 语句外部返回它。

练习说明:

Write a program that:

1. reads a number N (must be greater than 0) from the console
2. reads N numbers from the console
3. Displays the maximum of the N entered numbers.

我的代码:

public class Solution {
    public static void main(String[] args)  {
        Scanner sc = new Scanner(System.in);
        int i=0;  
        int count=1; 
        int max=Integer.MIN_VALUE; 

        for (i=0; i<count; i++) {
            int cur = sc.nextInt();
            count++;

            if (cur>0){
            if (cur>max) {
                max=cur ;
                System.out.println(max);
            }
            }
        }


    }}

在控制台中，我得到了所需的输入以及此错误

java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:862)
    at java.util.Scanner.next(Scanner.java:1485)
    at java.util.Scanner.nextInt(Scanner.java:2117)

Answer 1

首先，使用Scanner类时，必须导入java.util.Scanner。我改变了你的代码的一些行，我认为这就是你想要的:

import java.util.Scanner;

public class Solution {
    public static void main(String[] args)  {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt(); // get N (how many numbers)
        int number;
        int max = Integer.MIN_VALUE;

        if (n > 0) {
            for (int i = 0; i < n; i++) {
                number = sc.nextInt(); // get numbers
                if (number > max)
                    max = number;
            }

            System.out.println(max); // print the maximum number

        } else
            System.out.println("Please enter greather than 0 number"); // when n is negative or zero

    }
}