java(StringBuilder)练习

需求:将数组{1,2,3,4,5}变为[1,2,3,4,5]

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public class Boke {     public static void main(String args[]){         int[] arr = {1,2,3,4,5};         String x = Ayue(arr);         System.out.println(x);     }     public static String Ayue(int[] arr){         StringBuilder sb = new StringBuilder();         sb.append("[");         for(int i =0;i<arr.length;i++){             if(i==arr.length-1){                 sb.append(arr[i]);             }else{                 sb.append(arr[i]).append(",");             }         }         sb.append("]");         return sb.toString();     } }