java - 在二维数组中添加各个列和行并显示在一维数组表中？

Question

我是 Java 编程的初学者。我创建了二维数组，它生成随机数来填充数组。

但现在我需要单独计算行和列的总和，并使用某种方法将值存储在格式化为一维数组的单独表中...

这是我到目前为止所拥有的:

import java.util.*;
import java.math.*;

    public class Q42 {

	public static void main(String[] args) {

		//create the grid
		final int rowWidth = 4;
		final int colHeight = 5;

		Random rand = new Random();

		int [][] board = new int [rowWidth][colHeight];

		//fill the grid
		for (int row = 0; row < board.length; row++) {
			for (int col = 0; col < board[row].length; col++) {
				board[row][col] = rand.nextInt(10);
			}
		}

		//display output
		for(int i = 0; i < board.length; i++) {
			for(int j = 0; j < board[i].length; j++) {
				System.out.print(board[i][j] + " ");
				//System.out.println();
			}
			System.out.println();
		
} //end of main

	public static int[] sumTableRows(int[][] table)
	{
	    int rows = table.length;
	    int cols = table[0].length;

	    int[] sum = new int[rows];
	    for(int x=0; x<rows; x++)
	        for(int y=0; y<cols; y++)
	            sum[x] += table[x][y];
	    return sum;     
	}

    } //end of class Main

Answer 1

所以，如果我理解正确的话，这就是你想要做的:您有一个带有随机值的二维数组。您想要对每一行中的所有值求和并放入一个变量中。简单的。您可以这样做:

public static int[] sumTableRows(int[][] table)
{
    int rows = table.length;
    int cols = table[0].length;

    int[] sum = new int[rows];//make an array for sums

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

        for(int j=0; j<cols; j++){//iterate over all vars in the table array
            int temp  = table[i][j];//take value in point (i,j)
            sum[i] += temp;//sum it in sum[i].
        }
    }
    return sum;   //return the 1D array  
}