Two dimensional array summation exercise

Two dimensional array ： There are three ways to initialize arrays ： initiate static 、 dynamic initialization 、 Default initialization

Two dimensional array ：[][]

initiate static
In addition to using new Keyword to generate array outside , You can also allocate space and assign values to array elements while defining arrays .

eg:

int[][] arr = {
    {
    1,2},{
    4,5,6},{
    4,5,6,7,8,9,9}};
int[][] arr =new int[][] {
    {
    1,2},{
    4,5,6},{
    4,5,6,7,8,9,9}};

dynamic initialization
The definition of an array is separated from the operation of allocating space and assigning values to array elements .
eg:
int[][] arr = new int[3][]; // In essence, the length of one-dimensional array is defined as 3, Every “ lattice ” What is put in is an array

arr[0] = {
    1,2};
arr[1] = {
    3,4,5,6};
arr[2] = {
    34,45,56};

describe
Given a two-dimensional array , Please write a summation function , Calculate the sum of the array elements

Output description ：
Outputs the sum of two-dimensional array elements

    public static void main(String[] args) {
    
        int[][]  arr = {
    {
    11,33,50},{
    22,44,66,88},{
    131,214,315,146},{
    928,827,726,625},{
    424,525}};
       // Method body 1  Two dimensional array 
        int sum=add(arr);
        System.out.println(sum);
        // Method body 2  Singular group 
        int[]  arr1 = {
    5,10,5,10,5,5};
        int sum1=add1(arr1);
        System.out.println(sum1);
    }

    // utilize for  Loop iteration   Additive operation 

    private static int add1(int[] arr1) {
    

        int sum=0;

        for(int i=0;i<arr1.length;i++){
    
                sum=sum+arr1[i];

        }
        return sum;


}

    public static int add(int[][] arr) {
    
        int sum=0;

        for(int i=0;i<arr.length;i++){
    
            for(int j=0;j<arr[i].length;j++){
    
                sum=sum+arr[i][j];
            }
        }
        return sum;
    }

Running results

5175
40