Question

假设我打印出这张地图：

00000
00000
00000

如何将[0] [0]中的元素更改为X？

换句话说，如何使用屏幕输入使其看起来像这样：

X0000
00000
00000

Answer 1

考虑2D Array String类型... {/ p>

arr[0][0] = "X";

Answer 2

运行：

import java.util.*;
import java.lang.*;

class Main
{
        public static void main (String[] args) throws java.lang.Exception
        {
                String[][] array = {{"0","0","0"},{"0","0","0"},{"0","0","0"}};

                System.out.println("Before: ");
                printArray(array);


                array[0][0] = "x";
                System.out.println("After: ");
                printArray(array);

        }

        private static void printArray(String[][] array){
                for(int i=0; i<array.length; i++){
                        for(int j=0; j<array[0].length; j++){
                                System.out.print(array[i][j]);
                        }
                        System.out.println("");         
                }
        }
}

或者到这里：http://ideone.com/2DQC1

Answer 3

在此示例中，用户k检查数组元素值并更改它们

import java.util.Scanner;

public class HelloWorld{

     public static void main(String []args){
         Scanner in = new Scanner(System.in);
        int inputcol = 0;
        int inputrow = 0;
        int newnum = 0;
        int uinput = 0;
        int repeat = 1;
        int[][] a = new int[][]{
         { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 },
         { 110, 120, 130, 140, 150, 160, 170, 180, 190, 200 },
         { 210, 220, 230, 240, 250, 260, 270, 280, 290, 300 },
         { 310, 320, 330, 340, 350, 360, 370, 380, 390, 400 },
         { 410, 420, 430, 0, 440, 450, 460, 470, 490, 500 }
        }; 
        while(repeat!=0)
        {
        System.out.println("Select Option:\n 1 for View Value:\n 2 for Replace Value: ");
        uinput = in.nextInt();
        //int b[][]={{1,3,4},{3,4,5}}; 
        if(uinput==1)
        {
        System.out.println("Enter Row: ");
        inputrow = in.nextInt();
        System.out.println("Enter Cols:");
        inputcol = in.nextInt();
        System.out.println(a[inputrow][inputcol]);
        }
        else
        if(uinput==2)
        {
            System.out.println("Enter Row: ");
        inputrow = in.nextInt();
        System.out.println("Enter Cols:");
        inputcol = in.nextInt();
        System.out.println("Enter New Number: ");
        newnum = in.nextInt();
        a[inputrow][inputcol] = newnum;
        }
        else
        {
            System.out.println("Check your input. ");
        }
        System.out.println("Want to repeat it? if yes press 1\n for exit press 0 ");
        repeat = in.nextInt();
        }

     }
}

如何更改2D数组中数组元素的值？

3 个答案: