我怎么能用一个逗号分隔一行？ [英] How could I have my output separated in a line by exactly one comma?

问题描述

我的输出形式为1 1 1 2 2，但我想打印一行中用一个逗号分隔的数字



我尝试过：

I have a output in form "1 1 1 2 2 " but I wanted to print the numbers separated in a line by exactly one comma

What I have tried:

<pre lang="java"><pre>public class Main {

    static int a = 0;
    static int b = 0;

    public static void main(String[] args) {
        
        int n = Integer.parseInt(args[0]);
        a = Integer.parseInt(args[1]);
        b = Integer.parseInt(args[2]);
        for (int i = 0; i <= n; i++){
            System.out.print(recursiv(i));}

    }

    public static long recursiv(int n) {

        if (n >= 0 && n <= 2)
            return 1;

        else
            return a * recursiv(n - 2) + b * recursiv(n - 3);

    }

}

推荐答案

开始使用：

Get started with:

for (int i = 0; i <= n; i++){
    System.out.print(recursiv(i));
    System.out.print(",");
}

我让你处理最后一个号码。

I let you handle the last number.

你有一个 String [] 作为输入，为什么不用 String.join 作为输出？

As you have a String[] as the input, why don't you just use String.join for the output?

public static void main(String[] args) {
            System.out.print(String.join(",", args);
}

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