java(StringBuilder)练习

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();
    }
}