如何以降序显示二维数组 [英] how to display in descending order a two dimensional array

问题描述

我想按降序链接和排序二维数组.我以某种方式对我的程序进行了编码，以便您可以打印数组但它没有排序.我怎样才能让它排序?

I want to link and sort in descending order a two dimensional array. I coded my program in a way so that you can print the array but it is not sorted. How can I make it sorted?

这是一个计算8个员工一周(7天)工作小时数的程序，并按降序打印出来:

This is a program to calculate the number of hours worked by 8 employees during the week (7 days), and print them out in descending order:

public class WeeklyHours {
    public static void main(String[] args) {
        double[][] employeeWorkHours = { 
                { 2, 4, 3, 4, 5, 8, 8 },
                { 7, 3, 4, 3, 3, 4, 4 }, 
                { 3, 3, 4, 3, 3, 2, 2 },
                { 9, 3, 4, 7, 3, 4, 1 }, 
                { 3, 5, 4, 3, 6, 3, 8 },
                { 3, 4, 4, 6, 3, 4, 4 }, 
                { 3, 7, 4, 8, 3, 8, 4 },
                { 6, 3, 5, 9, 2, 7, 9 } };

        for (int row = 0; row < employeeWorkHours.length; row++)
            System.out.println("Employee " + row + " : "
                    + sumRow(employeeWorkHours, row));
    }

    public static double sumRow(double[][] m, int rowIndex) {
        double total = 0;

        for (int col = 0; col < m[0].length; col++) {
            total += m[rowIndex][col];
        }

        return total;
    }
}

这是我在控制台中得到的:

This is what I got in the console:

Employee 0 : 34.0
Employee 1 : 28.0
Employee 2 : 20.0
Employee 3 : 31.0
Employee 4 : 32.0
Employee 5 : 28.0
Employee 6 : 37.0
Employee 7 : 41.0

但我应该得到这样的东西:

But I am supposed to get something like this:

Employee 7: 41
Employee 6: 37
Employee 0: 34
Employee 4: 32
Employee 3: 31
Employee 1: 28
Employee 5: 28
Employee 2: 20

推荐答案

对您的代码进行一些更改:

With a few changes to your code:

public class WeeklyHours  {
public static void main(String[] args) {
    double[][] employeeWorkHours = { 
            { 2, 4, 3, 4, 5, 8, 8 },
            { 7, 3, 4, 3, 3, 4, 4 }, 
            { 3, 3, 4, 3, 3, 2, 2 },
            { 9, 3, 4, 7, 3, 4, 1 }, 
            { 3, 5, 4, 3, 6, 3, 8 },
            { 3, 4, 4, 6, 3, 4, 4 }, 
            { 3, 7, 4, 8, 3, 8, 4 },
            { 6, 3, 5, 9, 2, 7, 9 } };

    int len=employeeWorkHours.length;      
    double[][] employeeTotal=new double [len][2];

    for (int row = 0; row < len; row++) {
        employeeTotal[row][0]=row;
        employeeTotal[row][1]=sumRow(employeeWorkHours, row);                    
        System.out.println("Employee " + (int)employeeTotal[row][0] + 
                " : " + employeeTotal[row][1]);            
    }
    System.out.println("\nOrder by Hours:");
    Arrays.sort(employeeTotal, new java.util.Comparator<double[]>() {
        public int compare(double[] a, double[] b) {
        return Double.compare(b[1], a[1]);
        }
    });

    for (int row = 0; row < len; row++) 
        System.out.println("Employee " + (int) employeeTotal[row][0] +
                " : " + employeeTotal[row][1]);
}        

public static double sumRow(double[][] m, int rowIndex) {
    double total = 0;
    for (int col = 0; col < m[0].length; col++) {
        total += m[rowIndex][col];
    }
    return total;
}

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