如何打印列表末尾没有逗号? [英] How do I print the list out without a comma at the end?

问题描述

我的代码输出应以最后一个元素结尾，结尾不带逗号或空格.我无法弄清楚如何阻止它的发生.

我尝试过的事情:

My codes output should end with the last element, without a comma or space at the end. I''m having trouble figuring out how to stop it from happening.

What I have tried:

import java.util.Scanner;

public class PrintWithComma {
   public static void main (String [] args) {
      final int NUM_VALS = 4;
      int[] hourlyTemp = new int[NUM_VALS];
      int i;

      hourlyTemp[0] = 90;
      hourlyTemp[1] = 92;
      hourlyTemp[2] = 94;
      hourlyTemp[3] = 95;

      
      for(i = 0; i < NUM_VALS; i++)
      {
         
         System.out.print(hourlyTemp[i] + ", ");
         
        // if (i <= NUM_VALS)
        // {
          //  System.out.print(", ");
         //}
      }
      

      System.out.println("");
   }
}

推荐答案

两种方式:
第一种是手动将分隔符放在第二个及后续项目的前面:

Two ways:
The first is to manually put the separator in front of the second and subsequant items:

for(i = 0; i < NUM_VALS; i++)
      {
         if (i > 0)
             System.out.Print(", ");
         System.out.print(hourlyTemp[i]);
      }

还有许多其他方式可以执行该代码，但这是最清晰的.
另一种是使用Join函数:

There are many other ways to do that code, but that''s the clearest.
The other is to use a Join function: What''s the best way to build a string of delimited items in Java? - Stack Overflow[^] And then print that.

假设至少要打印1个项目，我这样做:

Assuming there is at least 1 item to print, I do this way:

System.out.print(hourlyTemp[0]);
for(i = 1; i < NUM_VALS; i++)
{
  System.out.print(", " + hourlyTemp[i]);
}

通过这种方式，它消除了在循环内进行测试的需要.

By doing this way, it remove the need to have a test inside the loop.

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