Question

在我的面向对象编程课程中，我有一项任务，要求我开发一个java代码，在使用.txt文件中的信息时打印出假公司的工资单信息。我能够打印出员工姓名和所有内容，但我在理解如何获得工资的平均值方面遇到一些麻烦，我已经开始采用这种方法，并在代码如下。任何帮助将不胜感激。

员工类：

public class Employee {
    private String firstName;
    private String lastName;
    private String rank;
    private double salary;

    public Employee(String firstName, String lastName, String rank, double salary) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
        this.rank = rank;
        this.salary = salary;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public String getRank() {
        return rank;
    }
    public void setRank(String rank) {
        this.rank = rank;
    }
    public double getSalary() {
        return salary;
    }
    public void setSalary(double salary) {
        this.salary = salary;
    }
}

和

prog5 class：

import java.util.*;
import java.io.*;

public class Prog5 {
    public static void main(String[] args) {

        String firstName = null;
        String lastName = null;
        String rank = null;
        double salary = 0.0;
        Scanner inFile = null;
        Employee[] arr = new Employee[99];
        int num = 0;

        try {
            inFile = new Scanner( new File ( "c:\\Users\\admin\\workspace\\Shumaker5\\src\\employees.txt"));
        }
        catch(FileNotFoundException e) {
            System.err.println(" File not found");
            System.exit(1);
        }

        //read file
        while(inFile.hasNext()) {
            try {
                firstName = inFile.next();
                lastName = inFile.next();
                rank = inFile.next();
                salary = inFile.nextDouble();
            }
            catch(InputMismatchException e) {
                System.err.println("File format error");
                System.exit(1);
            }

            Employee emp = new Employee(firstName, lastName, rank, salary);
            arr[num] = emp;
            num++;

            /**
             * method to calculate average
             * @param temperatures
             * @param counter
             * @return
             */
        /** public static double average( double[] salary, int num )
            {
                double sum = 0;
                for( int t = 0; t < num; t++)
            {
                    sum += salary[t];
            }
                return (double) sum / num; 
            } */

            System.out.println(emp);
        }   
        System.out.println();
        System.out.println("Wayne Industries");
        System.out.println();
        System.out.println("Number of Employees:    " + num);
        System.out.println("Average Salary:   ");
        System.out.println("Annual Total:    ");
        System.out.println();
        System.out.printf("%-15s %-15s %-6s %-8s \n", "Last Name", "First Name", "Rank", "Salary");
        System.out.println();

        for(int x = 0; x < num; x++) {
            System.out.printf("%-15s %-15s %-6s %-8.2f\n", arr[x].getLastName(),
                    arr[x].getFirstName(), arr[x].getRank(), arr[x].getSalary());
        }
        inFile.close();
    }
}

Answer 1

我怀疑你需要首先以字符串的形式检索薪水，然后提取双倍（例如使用Double.parseDouble（薪水））。希望这有帮助！

Answer 2

你非常接近。我们只需要传递一系列员工（而不是他们的工资）并计算方法中的平均值。下面提供了一个示例：

public static double average( Employee[] employees ){
        double sum = 0;
        for( int t = 0; t < employees.length; t++){
            sum += employee[t].getSalary();
        }
        return (double) sum / employees.length; 
    }

从.txt文件获取信息时，无法找到平均值和总数

2 个答案: