如何使用多维数组获取java中每一行的总和？

Question

所以我是 java 的新手，目前正在尝试学习如何使用数组。 所以我想做的是创建一个程序，作为用户的行数和列数，并打印二维数组的总和。

所以输出应该是这样的：

Enter the number of row:2
Enter the number column:2 

Enter a number:1
Enter a number:2
Enter a number:3
Enter a number:4

Output: 

1 2 3
3 4 7

这是我的输出：

Enter the number of row:2
Enter the number column:2 

Enter a number:1
Enter a number:2
Enter a number:3
Enter a number:4

Output: 

1 2
3 4

不知何故，我找不到一种方法来总结每一行。

这是我的代码：

import java.util.Scanner;

public class Main
{
    public static void main(String[] args) {

        int sum = 0;

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the number of row: ");
        int row = input.nextInt();
        System.out.print("Enter the number of column: ");
        int column = input.nextInt();

        int [][] array = new int[row][column];

        for(int i = 0; i<row; i++){
            for(int j = 0; j<column; j++){
                System.out.print("Enter a number: ");
                array[i][j] = input.nextInt();

            }

        }


        for(int i = 0; i<row; i++){
            for(int j = 0; j<column; j++){
                System.out.print(array[i][j]+" ");

            }
            System.out.println();
        }


    }
}

在过去的 3 个小时里，我一直在尝试这样做，但我似乎无法找到一种方法来对每一行求和。 我在这方面很新，所以任何帮助将不胜感激！

Answer 1

所以基本上，为每一行初始化一个变量来计算给定行的所有元素的总和。 在元素显示后显示

import java.util.Scanner;

public class Main
{
    public static void main(String[] args) {


        Scanner input = new Scanner(System.in);

        System.out.print("Enter the number of row: ");
        int row = input.nextInt();
        System.out.print("Enter the number of column: ");
        int column = input.nextInt();

        int [][] array = new int[row][column];

        for(int i = 0; i<row; i++){
            for(int j = 0; j<column; j++){
                System.out.print("Enter a number: ");
                array[i][j] = input.nextInt();

            }

        }


        for(int i = 0; i<row; i++){

            int s = 0; // this variable calculates the sum
            for(int j = 0; j<column; j++){

                s+=a[i][j]; // summing elements of that row
                System.out.print(array[i][j]+" ");

            }
            System.out.println(s);
        }


    }
}

Answer 2

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String args[]) {
        Scanner input = new Scanner(System.in);/*initializing the variable input with   
        new Scanner object*/


        System.out.println("Enter the number of rows");/*getting the number of rows 
        and columns of the 2D array as an user input*/

        int noOfRows=input.nextInt();
        System.out.println("Enter the number of columns");
        int noOfColumns=input.nextInt();

        int newArr[][] = new int[noOfRows][noOfColumns];//creation of the 2D array

        for(int i = 0 ; i < noOfRows ; i++) {/*Goal of this for loop is to assign the 
        userInpts to the array indexes*/
            for(int j = 0 ; j < noOfColumns ; j++) {
                System.out.println("Enter a number");/*Getting the user inputs to 
                store in the array*/
                newArr[i][j] = input.nextInt();


            }
    }

     for(int i = 0 ; i < noOfRows ; i++) {/*Goal of this for loop is printing the 
     array and sum of the row at the end of the each row*/
          int sumofTheRow = 0;/*This is the variable which holds the sum of the 
          current row so initial value is 0 */
        for(int j = 0 ; j < noOfColumns ; j++) {
            sumofTheRow  += newArr[i][j];/*so inside the inner for loop sumOfTheRow 
             will be calculated by adding the elements in the row one by one*/
            System.out.print(newArr[i][j] + " ");

        }
        System.out.println(sumofTheRow);//Calculated sum of the row will be displayed 

        /*So now if i is less than noOfRows then again it will increment the value of i by one and move to the next row */

    }
    input.close();/*closing the scanner variable to avoid memory leaks --> [ now garbage collector will free the memory area of scanner object  by collecting the scanner object]*/









}

}