【java】合并数组的两种方法

1.利用arraycope的方法

public class MergeArr {public static void main(String[] args) {int[] arr1 = {1,2,3,4,5,6};int[] arr2 = {7,8,9};//合并完的数组int[] arr3 = new int[arr1.length + arr2.length];System.arraycopy(arr1, 0, arr3, 0, arr1.length);System.arraycopy(arr2, 0, arr3, arr1.length, arr2.length);System.out.println(Arrays.toString(arr3));}} 

2.将两数组合并 ，在排序

 public static void main(String[] args) {int[] arr1 = {1,2,3};int[] arr2 = {1,4,5};int[] arr3 = mergeArr(arr1,arr2);compareArr(arr3);for (int i =0;i<arr3.length;i++){System.out.println(arr3[i]+" ");}}public  static int[] mergeArr(int[] arr1,int[] arr2 ){int[] arr3 = new int[arr1.length+arr2.length];//将arr1 存入新数组for(int i =0;i<arr1.length;i++){arr3[i] = arr1[i];}//将arr2 存入新数组for(int i =0;i<arr2.length;i++){arr3[arr1.length+i] = arr2[i];}return arr3;}public static void compareArr(int[] arr ){for(int i =0;i<arr.length-1;i++){for(int j = 0;j<arr.length-i-1;j++){if(arr[j]>arr[j+1]){int temp = arr[j];arr[j] = arr[j+1];arr[j+1] = temp;}}}}