当涉及多个对象时，用于更新变量的用户输入

Question

我现在正在学习java，开始学习方法、类和对象。我正在尝试编写一个简单的程序，为公司的2个单独的员工设置值，然后允许用户输入来改变特定对象的某些变量。需要通过用户输入更新的变量是对象Employee2的MonthlySalary和FirstName。我真的不确定如何构造用户输入部分，我正不知所措，试图找到一个解决方案。

import java.util.Scanner;

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

        Scanner input = new Scanner(System.in);
        
        // Create 2 Employee objects
        Employee employee1 = new Employee( "Jane", "Doe", 5000 );
        Employee employee2 = new Employee( "John", "Bloggs", 4500 );

        // Do other steps (not requiring input)

        // Ask for user input of Employee 2's new first name
        System.out.println( "Please enter new first name for Employee 2: \n");
        String input = employee2.newFirstName();
        
        // repeat above to set Employee 2's new salary then display new information


   }
}

使用类文件Employee.java

public class Employee
{
   private String firstName;           // Employee's First Name
   private String lastName;            // Employee's Last Name
   private double monthlySalary;       // Employee's Monthly Salary

// Employee constructor
   public Employee( String initFirstName, String initLastName, double initMonthlySalary ) 
   {
      firstName = initFirstName;
      lastName = initLastName;
      if (initMonthlySalary > 0)
          monthlySalary = initMonthlySalary;
      else
          monthlySalary = 0;
   }

    public Employee( )
    {
        firstName = "";
        lastName = "";
        monthlySalary = 0;
    }

// Method to assign the employee's First Name
   public void setFirstName( String newFirstName )                   
   {
      firstName = newFirstName;
   }

// Method to assign the employee's Monthly Salary
   public void setMonthlySalary( double newMonthlySalary )           
   {
      if (newMonthlySalary > 0) monthlySalary = newMonthlySalary;
   }

// Other required methods

}

Answer 1

您正在努力从控制台获取输入。

System.out.println("Please enter new first name for Employee 2: ");
    String firstName = input.next();
    employee2.setFirstName(firstName);

    System.out.println("Please enter new Salary for Employee 2: ");
    double salary = input.nextDouble();
    employee2.setMonthlySalary(salary);

这对你管用。请先了解基本语法。因为否则你就是在浪费自己的时间，为这种句法上的怀疑而发牢骚。