自编数组的工具类(toString, sort)

/*** Author：Liu Zhiyong* Version：Version_1* Date：2016年4月16日19:46:40* Desc：编写数组的工具类:toString(); sort();*/class MyArrays{public static String toString(int[] arr){String result = "";for(int i=0; i<arr.length; i++){if(i == 0){result += "["+arr[i]+",";}else if(i == arr.length-1){result += arr[i]+"]";}else{result += arr[i]+",";}}return result;}public static void sort(int[] arr){for(int i=0; i<arr.length; i++){for(int j=i+1; j<arr.length; j++){if(arr[i] >arr[j]){int temp = arr[i];arr[i] = arr[j];arr[j] = temp;}}}}}class  Demo44{public static void main(String[] args) {int[] arr = {12, 43, 21, 99, 2};System.out.println(MyArrays.toString(arr));MyArrays.sort(arr);System.out.println(MyArrays.toString(arr));System.out.println("Hello World!");}}