如何在我的 ArrayList 中搜索特定人員的詳細信息？ 我將如何編輯或刪除它們？

Question

我有一個 ArrayList 要求用戶輸入然后存儲每個員工的詳細信息。 如何顯示存儲在此 ArrayList 中的所有內容或搜索特定員工？ 我將如何從 ArrayList 中編輯或刪除該員工？ 我有兩個類，一個 salesPerson - 我有所有變量、setter、getter 和構造函數，以及 salesPersonMain - 我有用戶輸入提示、存儲到數組等。

我可以將員工添加到 ArrayList 並在結束輸入循環時查看他們。

public class salesPersonMain {

public static void main(String[] args) throws InputValidationException {

    Scanner input = new Scanner(System.in);
    List<salesPerson> sPerson = new ArrayList<salesPerson>();

    while (true) {


        System.out.println("Enter id (press 'q' to quit): ");
        String temp = input.nextLine();
        if (temp.equals("q")) break;

        int id = Integer.parseInt(temp);

        System.out.println("Enter first name:");
        String firstName = input.nextLine();

        System.out.println("Enter last name:");
        String lastName = input.nextLine();


        //save in array list
        sPerson.add(new salesPerson(id, firstName, lastName));

    }
    for (salesPerson salesPerson : sPerson) {
        System.out.println(salesPerson);
       }
    }
 }

銷售人員類：

import java.util.ArrayList;

public class salesPerson{
    //create variables for sales person
    private int id;
    private String firstName;
    private String lastName;

    public salesPerson() {

    }

    //Setters and getters
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) throws InputValidationException {
        if (firstName.matches("\\p{Upper}(\\p{Lower}){2,20}")) {
        } else {
            throw new InputValidationException();
        }
        {
            this.firstName = firstName;
        }
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName)throws InputValidationException {
        if (lastName.matches("\\p{Upper}(\\p{Lower}){2,20}")) {
        } else {
            throw new InputValidationException();
        }
        {
            this.lastName = lastName;
        }
    }



    public void setCurrentCarMake(String currentCarMake) throws InputValidationException {
        if (currentCarMake.matches("(\\p{Alpha}{2,14})")) {
        } else {
            throw new InputValidationException();
        }
        {
            this.currentCarMake = currentCarMake;
        }
    }

    public String getCurrentCarModel() {
        return currentCarModel;
    }

    public void setCurrentCarModel(String currentCarModel) throws InputValidationException {
        if (currentCarModel.matches("(\\p{Alnum}{1,10})")) {
        } else {
            throw new InputValidationException();
        }
        {
            this.currentCarModel = currentCarModel;
        }
    }



    //create constructor
    public salesPerson(int id, String firstName, String lastName) throws InputValidationException {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }
    @Override
    public String toString() {
        return id + ", " + firstName + " " + lastName;
    }
}

Answer 1

那么你所嘗試的將負責在銷售人員List Of SalesPerson Object中搜索部分並顯示更正。 您可以像下面的代碼一樣做更多的修改來處理刪除部分。

銷售人員Main.java

public class SalesPersonMain {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    CopyOnWriteArrayList<SalesPerson> sPerson = new CopyOnWriteArrayList<>(); //List will fail in case of remove due to ConcurrentModificationException

    while (true) {
        System.out.println("Enter id (press 'q' to quit): ");
        String temp = input.nextLine();
        if (temp.equals("q")) break;

        int id = Integer.parseInt(temp);

        System.out.println("Enter first name:");
        String firstName = input.nextLine();

        System.out.println("Enter last name:");
        String lastName = input.nextLine();
        sPerson.add(new SalesPerson(id, firstName, lastName));

    }
    //Search
    System.out.println("Enter String to search & display");
    String searchString = input.nextLine();
    for (SalesPerson salesPerson : sPerson) {
        if(salesPerson.search(searchString)!=null){
            System.out.println(salesPerson.toString());
        }
    }
    //Remove
    System.out.println("Enter String to search & remove");
    searchString = input.nextLine();
    for (SalesPerson salesPerson : sPerson) {
        if(salesPerson.search(searchString)!=null){
            System.out.println(salesPerson.toString()+" is removed from the List");
            sPerson.remove(salesPerson);
        }
    }
    //Display All
    System.out.println("Final List : ");
    for (SalesPerson salesPerson : sPerson) {
        System.out.println(salesPerson.toString());
    }
}

}

銷售人員.java

public class SalesPerson {

public SalesPerson(Integer id, String firstName, String lastName) {
    this.id = id;
    this.firstName = firstName;
    this.lastName = lastName;
}

Integer id;
String firstName;
String lastName;

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

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;
}

@Override
public String toString() {
    return "{" +
            "'id':" + id +
            ", 'firstName':'" + firstName + '\'' +
            ", 'lastName':'" + lastName + '\'' +
            '}';
}

public SalesPerson search(String search){
    if(firstName.matches("(.*)"+search+"(.*)") || lastName.matches("(.*)"+search+"(.*)")){
        return this;
    }
    return null;
}

}

試試上面的代碼，希望你知道在哪里改變更多。

Answer 2

假設一個 salesPerson 類，例如：

public class salesPerson {


    private int id;
    private String firstName, lastName;

    public salesPerson() {}

    public salesPerson(int id, String firstName, String lastName)
    {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public int getId() {
        return id;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

}

您可以執行以下操作來搜索要刪除的特定內容：

        int searchIndex = 0;

    for (int i = 0; i < sPerson.size(); i++) {
        salesPerson currentPerson = sPerson.get(i);
        //Prints current person
        System.out.println(currentPerson.getId() + " " + currentPerson.getFirstName() + " " + currentPerson.getLastName()); 
        if (currentPerson.getId() == 40) //Change 40 and getId to whatever you want to search for
        {
            searchIndex = i;
        }
    }
    //The remove is outside the loop because you don't want to change the index during the loop or you might run into problems
    sPerson.remove(searchIndex);
    }

您可以編輯它以搜索多個值或將其放入帶有搜索值等參數的方法中。