三维形体投影面积（java）

问题描述：

样例如下：


代码如下：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class ProjectionArea {
    public int projectionArea(int[][] grid) {
      return topView(grid)+frontView(grid)+sideView(grid);
    }
    //俯视图
    public int topView(int[][] grid){
        int res=0;//扫描所有元素，若该点的元素值大于1，则表示在俯视图中存在一块小正方形
        for (int i = 0; i <grid.length ; i++) {
            for (int j = 0; j <grid[0].length ; j++) {
                if (grid[i][j]>0)res++;
            }
        }
        return res;
    }
    //正视图
    public int frontView(int[][] grid){
        int res=0;
        for (int i = 0; i <grid[0].length ; i++) {
            int temp=0;//记录该列最大值
            for (int j = 0; j <grid.length ; j++) {
                if (grid[j][i]>temp)temp=grid[j][i];
            }
            res+=temp;
        }
        return res;
    }
    //侧视图
    public int sideView(int[][] grid){
        int res=0;
        for (int i = 0; i <grid.length ; i++) {
            int temp=0;//记录该行的最大值
            for (int j = 0; j <grid[0].length ; j++) {
                if (grid[i][j]>temp){
                    temp=grid[i][j];
                }
            }
            res+=temp;
        }
        return res;
    }

    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("请输入二维数组行数");
        int n=scanner.nextInt();
        int[][] grid=new int[n][];
        System.out.println("请输入二维数组(按行输入，元素之间用逗号隔开)");
        try {
            for (int i = 0; i <n ; i++) {
                String[] temp=bufferedReader.readLine().split(",");
                int[] a=new int[temp.length];
                for (int j = 0; j <temp.length ; j++) {
                    a[j]=Integer.parseInt(temp[j]);
                }
                grid[i]=a;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("该图的三视图之和为：");
        ProjectionArea projectionArea=new ProjectionArea();
        int res=projectionArea.projectionArea(grid);
        System.out.println(res);
    }
}

运行结果如下：