添加到ArrayList然后删除元素的问题

• Z时代
• 2024-01-10
• 分类：问答

如果在某处曾问过这个问题，我很抱歉，但是我确实没有看到任何有助于确切问题的东西。这是为了学校的工作，但我试图弄清楚我做错了什么，所以如果有人能帮上忙，我会熬过2天。添加到ArrayList然后删除元素的问题

我有一个程序，基本上应该输入两个销售人员的名字，显示他们的潜在收益表，最后比较他们的销售差异。我在NetBeans IDE中执行此操作，并且在此处尝试找出各种各样的东西。

一切工作正常，直到我试图从我的ArrayList中拉出任何东西。我认为应该有可能在那里存储一些东西，然后把它拉回来做我需要做的数学，但我一定是做错了什么。下面是我有问题的具体课程代码：

class EarningDifference { 
    SalesPerson persons = new SalesPerson(); //Access to SalesPerson class 
    AnnualSales aSaleC = new AnnualSales(); //Access to AnnualSales class 
    ArrayList<SalesPerson> list = new ArrayList<>(); //Access to SalesPerson ArrayList 
    ArrayList<AnnualSales> aSales = new ArrayList<>(); //Access to AnnualSales ArrayList 
    AnnualSales person1EarningStr; //Person one earnings from AnnualSales ArrayList 
    AnnualSales person2EarningStr; //Person two earnings from AnnualSales ArrayList 
    Double person1Earning; //Person one earnings as double 
    Double person2Earning; //Person two earnings as double 
    String person1; //String for person one full name 
    String person2; //String for person two full name 
    Double difference; //Variable to store the difference between Person1 and Person2 sales 
    double totalSales; //variable for Total sales 
public void people() { 
    person1 = list.get(0).getFirstName() + " " + list.get(0).getLastName(); 
    person2 = list.get(1).getFirstName() + " " + list.get(1).getLastName(); 
    System.out.println("Comparing " + person1 + " with " + person2 + "."); 
} 
void settotalSales(Double totalSales) { 
    this.totalSales = totalSales; 
     AnnualSales person1EarningStr = aSales.get(0); 
     AnnualSales person2EarningStr = aSales.get(1); 
    double person1Earning = person1EarningStr.doubleValue(); 
    double person2Earning = person2EarningStr.doubleValue(); 
    if (aSales.size() < 2) { 
     System.out.println("Need another person to compare"); 
    } else if (person1Earning > person2Earning) { 
     difference = person1Earning - person2Earning; 
     System.out.println(person1 + " has earned " + difference + " more in sales than " + person2 + "."); 
    } else { 
     difference = person2Earning - person1Earning; 
     System.out.println(person2 + " has earned " + difference + " more in sales than " + person1 + "."); 
    } 
} 

}

这里是哪里的项目被添加到AnnualSales的ArrayList类：我敢肯定，这是

public class SalaryTotal { 
     double fixedSalary; //Variable for the fixed salary amount 
     double commission; //Variable for the comission 
     double minimumSales; //Variable to define the minimum amount of annual sales sales persn must make to receive compensation 
     double maximumSales; //Variable to define the number after which commission increases 
     double advanceRate; //Variable used to define the rate at which compensation increases after minimum sales are met 
     double compensation; //Variable for the amount of compensation based on sales 
     double totalSalary; //Variable for the total salary 
     double totalSales; 
     Double compensationD; 
     SalesPerson persons = new SalesPerson(); 
     ArrayList<SalesPerson> list = new ArrayList<>(); 
     ArrayList<Double> aSales = new ArrayList<>(); 
    public void getCompensation(double totalSales) { 
      commission = .21; //The constant commission rate 
      minimumSales = 120000; //The constant minimum sales needed to receive compensation 
      maximumSales = 150000; //The constant maximum amount above which commission increases by the advanceRate 
      advanceRate = 1.67; //The constant at which compensation increasea after minimum sales 
       this.totalSales = totalSales; 
       if (totalSales < minimumSales) { 
        compensation = 0; //sets compensation to 0 if minimum sales are not met 
       } else if (totalSales <= 150000){ 
        compensation = totalSales * commission + fixedSalary; //calculates total of compensation if total sales meet minimum sales 
       } else if (totalSales > maximumSales) { 
        compensation = totalSales * commission * advanceRate + fixedSalary; //calculates total compensation if total sales exceed maximum sales 
       } 
       Double compensationD = new Double(compensation); 
       aSales.add(compensationD); 
       System.out.println("Current total compensation:" + compensation); 
        for (int i = 0; i < aSales.size(); i++) { 
        System.out.println(aSales.get(i)); 
        System.out.println("Show " + persons.makePerson1() + "."); 
        } 
     } 
      } 
    } 

一个完整的糟糕的编码混乱，但任何帮助将不胜感激，只是忽略我放入的奇怪编码的随机位，试图缩小我的问题。非常感谢。

程序的其余部分是这样的，我也删除了只是在以前的部分

主要位：

import java.util.Scanner; //Needed for scanner input 
import java.text.DecimalFormat; //Needed for correct output of decimals 
import java.util.ArrayList; 
public class AnnualCompensation { 
    private static String Y; 
public static void main(String[] args) { 
    DecimalFormat df = new DecimalFormat("$###,###.00"); //This will correctly format the money amounts 
    Double totalSales; 
    int startY; 
    ArrayList<SalesPerson> list = new ArrayList<>(); 
    ArrayList<AnnualSales> aSales = new ArrayList<AnnualSales>(); 
    Scanner start = new Scanner(System.in); //Creates scanner input 
    System.out.println("Are you ready to compare sales? Press 1 if yes, 2 if no."); //Prints out entry command 
    startY = start.nextInt(); 
    switch (startY){ 
    case 1: 
     InputClass inputs = new InputClass(); 
     inputs.getInputs(); 
     break; 
    case 2: 
     System.out.println("Thank you anyway!"); 
     System.exit(0); 
     break; 
    default: 
     System.out.println("You have selected neither Y or N, please try again."); 
     System.exit(0); 
} 
    SalaryTotal calculator = new SalaryTotal(); //Calls class SalaryTotal 
    PossibleCompensation table = new PossibleCompensation(); //Calls class PossibleCompensation 
} 
} 

可能的补偿：

public class PossibleCompensation { 
    SalesPerson persons = new SalesPerson(); 
    ArrayList<SalesPerson> list = new ArrayList<>(); 
    ArrayList<AnnualSales> aSales = new ArrayList<AnnualSales>(); 
DecimalFormat df = new DecimalFormat("$###,###.00"); //This will correctly format the money amounts 
double commission; //Variable for the comission 
double minimumSales; //Variable to define the minimum amount of annual sales sales persn must make to receive compensation 
double maximumSales; //Variable to define the number after which commission increases 
double advanceRate; //Variable used to define the rate at which compensation increases after minimum sales are met 
double compensation; //Variable for the amount of compensation based on sales 
double totalSales; //Variable for sales person annual sale 
public void settotalSales(double totalSales) { 
    for (int i = 0; i < list.size(); i++) 
     this.totalSales = totalSales; //Sets the input from AnnualCompensation to totalSales in this class 
     commission = .21; //The constant commission rate 
     minimumSales = 120000; //The constant minimum sales needed to receive compensation 
     maximumSales = 150000; //The constant maximum amount above which commission increases by the advanceRate 
     advanceRate = 1.67; //The constant at which compensation increasea after minimum sales 
     String heading1 = "Total Sales"; //variable to print a header for the table 
     String heading2 = "Total Compensation"; //variable to print a header for the table 
     System.out.print("\nBelow is a table based on possible commissions if sales increase:\n"); //Prints instructions 
     System.out.printf("\n%20s %20s", heading1, heading2); //prints header and formats spacing 
     for (double i=totalSales; i <= (totalSales * 1.5); i+= 5000) { //FOR loop for calculating and constructing table 
       if (i < minimumSales) { 
        compensation = 0; //sets compensation to 0 if minimum sales are not met 
       } else if (i <= 150000){ 
        compensation = i * commission; //calculates total of compensation if total sales meet minimum sales 
       } else if (i > maximumSales) { 
        compensation = i * commission * advanceRate; //calculates total compensation if total sales exceed maximum sales 
       } 
      System.out.printf("\n%20s %15s", df.format(i), df.format(compensation) + "\n"); //Prints out the table 
    } 
} 
} 
class SalesPerson { 
String firstName; 
String lastName; 
String totalSalesStr; 
ArrayList<SalesPerson> list = new List<>(); 

SalesPerson等级：

public SalesPerson() { 
    this.firstName = firstName; 
    this.lastName = lastName; 
    this.totalSalesStr = totalSalesStr; 
} 
SalesPerson(String firstName, String lastName, String totalSalesStr) { 
    this.firstName = firstName; 
    this.lastName = lastName; 
    this.totalSalesStr = totalSalesStr; 
} 
public String getFirstName() { 
    return this.firstName; 
} 
public String getLastName() { 
    return this.lastName; 
} 
public String getTotalSalesStr() { 
    return this.totalSalesStr; 
} 
public Double getTotalSales() { 
    Double totalSales = Double.parseDouble(totalSalesStr); 
    return totalSales; 
} 
public String makePerson1() { 
    String person1 = list.get(0).getFirstName() + " " + list.get(0).getLastName(); 
    return person1; 
} 
public String makePerson2() { 
    String person2 = list.get(1).getFirstName() + " " + list.get(1).getLastName(); 
    return person2; 
} 
@Override 
public String toString() { 
    return ("Sales person " + this.getFirstName() + " " + this.getLastName() + " has annual sales of " + this.getTotalSalesStr() + "."); 
} 
} 
class AnnualSales { 
Double compensationD; 
AnnualSales person1EarningStr; 
AnnualSales person2EarningStr; 
ArrayList<AnnualSales> aSales = new ArrayList<AnnualSales>(); 
public AnnualSales() { 
    this.compensationD = compensationD; 
} 
public AnnualSales(Double compensationD) { 
    this.compensationD = compensationD; 
} 
public Double getCompensationD() { 
    return this.compensationD; 
} 
public AnnualSales getperson1EarningStr() { 
    person1EarningStr = aSales.get(0); 
    return person1EarningStr; 
} 
public AnnualSales getperson2EarningStr() { 
    person2EarningStr = aSales.get(1); 
    return person2EarningStr; 
} 
@Override 
public String toString() { 
    return ("please show us" + compensationD); 
} 
} 

Input类：

class InputClass { 
String firstName; 
String lastName; 
Double totalSales; 
String totalSalesStr; 
CopyOnWriteArrayList<SalesPerson> list = new CopyOnWriteArrayList<>(); 
public void getInputs() { 
    for(double i=0; i < 2; i++){ 
     Scanner persFN = new Scanner(System.in); //Creates scanner input 
     System.out.println("Enter sales person's first name:"); //Prints out entry command 
     String firstName = persFN.next(); 
     Scanner persLN = new Scanner(System.in); //Creates scanner input 
     System.out.println("Enter sales person's last name:"); //Prints out entry command 
     String lastName = persLN.next(); 
     Scanner input = new Scanner(System.in); //Creates scanner input 
     System.out.println("Enter Total Sales:"); //Prints out entry command 
     totalSales = input.nextDouble(); 
     String totalSalesStr = totalSales.toString(); 
     list.add(new SalesPerson(firstName, lastName, totalSalesStr)); 
     SalaryTotal calculator = new SalaryTotal(); //Calls class SalaryTotal 
     calculator.getCompensation(totalSales); 
     PossibleCompensation table = new PossibleCompensation(); //Calls class PossibleCompensation 
     table.settotalSales(totalSales); 
     EarningDifference earning = new EarningDifference(); 
     earning.settotalSales(totalSales); 
    } 
} 
} 

我认为这应该是相关的一切！

回答：

以上是 添加到ArrayList然后删除元素的问题 的全部内容， 来源链接： utcz.com/qa/259313.html