Array sorting, element search and element addition

import java. util. Arrays;

public class array_sort {
    public static void main(String args[]) throws Exception{
        int array[]={2,5,-2,6,-3,8,-7,-9,4};
        System.out.print("初始数组为：");
        printArray(array);
        Arrays.sort(array);
        System.out.print("数组排序结果为：");
        printArray(array);
        int index=Arrays.binarySearch(array,6);
        System.out.println("元素2在"+index+"位置");
        array=insertElement(array,3,20);
        System.out.println("插入元素后的数组为：");
        printArray(array);
    }
    public static void printArray(int array[]){
        for(int i=0;i<array.length;i++){
            if(i!=0){
                System.out.print(",");
            }
            System.out.print(array[i]);
        }
        System.out.println();
    }
    public static int[] insertElement(int array[],int index,int value){
        int length=array.length;
        int array1[]=new int[length+1];
        for(int i=0;i< index;i++){
            array1[i]=array[i];
        }
        array1[index]=value;
        for(int i=index+1;i<array1.length;i++){
            array1[i]=array[i-1];
        }
        return array1;
    }
}