java - 如何从用户那里读取 10 个整数，并在不使用数组的情况下识别第二大整数？

Question

public static void main (String [] args) {

    //declare variables

    int numbers;
    int secondHighest;

    // create scanner to enter 10 digits

    Scanner scanner =  new Scanner(System.in);
    System.out.print("Enter 10 digits: ");
    numbers = scanner.nextInt();



    for (numbers = 0; numbers > 10; numbers++);

    for (secondHighest =+ 0 ; secondHighest < 10; secondHighest++)
    System.out.print( secondHighest);

这就是我达到的程度，我可以让用户输入这 10 个数字，但是在弄清楚如何让程序识别这 10 个数字中哪一个是第二高的问题时遇到了问题，还值得一提的是，这些数字需要一行写成这样:

提供10个整数:67 -468 36 1345 -7778 0 34 7654 45 -666

第二大的是:1345

Answer 1

您可以按如下方式进行:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int num = 0, highest = Integer.MIN_VALUE, secondHighest = Integer.MIN_VALUE + 1;
        Scanner scanner = new Scanner(System.in);
        for (int i = 1; i <= 10; i++) {
            System.out.print("Enter an integer: ");
            num = scanner.nextInt();
            if (num > secondHighest && num <= highest) {
                secondHighest = num;
            }
            if (num > highest) {
                secondHighest = highest;
                highest = num;
            }
        }
        System.out.println("Second highest number is: " + secondHighest);
    }
}

示例运行:

Enter an integer: 10
Enter an integer: -2
Enter an integer: 0
Enter an integer: 34
Enter an integer: -78
Enter an integer: 78
Enter an integer: 56
Enter an integer: 0
Enter an integer: 89
Enter an integer: -34
Second highest number is: 78

<小时/>

[更新]

如果您想在同一行中输入所有数字，请按以下步骤操作:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int num = 0, highest = Integer.MIN_VALUE, secondHighest = Integer.MIN_VALUE + 1;
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter 10 integers: ");

        for (int i = 1; i <= 10; i++) {
            if (scanner.hasNextInt()) {
                num = scanner.nextInt();
            }
            if (num > secondHighest && num <= highest) {
                secondHighest = num;
            }
            if (num > highest) {
                secondHighest = highest;
                highest = num;
            }
        }
        System.out.println("Second highest number is: " + secondHighest);
    }
}

示例运行:

Enter 10 integers: 10 -3 24 0 56 -5 34 78 89 -6
Second highest number is: 78