java往数组里添加数据 java向数组添加数据

public class ListInsert {
	public static long[] insert(long[] arr,int i,long l){
		//新建数组,对原数组扩容
		long[] arr1 = new long[arr.length+1];
		//将原数组数据赋值给新数组
		for(int j = 0;j<arr.length;j++){
			arr1[j] = arr[j];
		}
		//将大于i的数据向后移动一位
		for(int j = arr1.length-2;j>i;j--){
			arr1[j+1] = arr1[j];
		}
		//赋值到i位置
		arr1[i+1] = l;
		return arr1;
	}
	//测试
	public static void main(String[] args){
		long[] arr = {12,25,11,36,14};
		long[] arr1 = insert(arr, 2, 100);
		for (long l : arr1) {
			System.out.print(l+" ");
		}
	}