java - 有没有办法让整个代码更短？

Question

我目前正在为这项任务的一件事而苦苦挣扎。我只是想要一种使整个代码更短的方法，甚至只是一点点(特别是 if 语句)。

package Integers;

import java.util.Scanner;

public class SumOfInt {
    public static void main(String[] args) {
        int positive = 0;

        System.out.println ("-Input ten non-zero integers to calculate their sum. " + "\n" + "-Input the integers at the console and press <Enter>" + "\n");

        System.out.println ("Input the 1st integer:");
        Scanner input = new Scanner (System.in);
        int num1 = input.nextInt ();

        System.out.println ("Input the 2nd integer:");
        int num2 = input.nextInt ();

        System.out.println ("Input the 3rd integer:");
        int num3 = input.nextInt ();

        System.out.println ("Input the 4th integer:");
        int num4 = input.nextInt ();

        System.out.println ("Input the 5th integer:");
        int num5 = input.nextInt ();

        {   if (num1 > 0)
                positive++;
        }
        {   if (num2 > 0)
                positive++;
        }
        {   if (num3 > 0)
                positive++;
        }
        {   if (num4 > 0)
                positive++;
        }
        {   if (num5 > 0)
                positive++;
        }

        System.out.println ("The number of positive integers are: " + positive);
    }
}

Answer 1

如果您发现自己一遍又一遍地编写非常相似的代码(甚至是复制粘贴的内容)，那么总有一种方法可以概括代码并将其放入 for 循环或额外的方法中。这就是要走的路。在您的情况下，您可以简单地使用 for 循环。

public static void main(String[] args) {
  int positive = 0;
  System.out.println("Input the integers at the console and press <Enter>");

  Scanner input = new Scanner (System.in);
  for (int i = 1; i <= 5; i++) {
    System.out.println("Input the " + i + "st integer:");
    int x = input.nextInt();
    if (x > 0) positive++;
  }
  input.close();
  System.out.println ("The number of positive integers are: " + positive );
}