如何向這個子類添加一個arrayList？

背景關系 - 所以有兩個類使用繼承。EmployeeService 是父類，EmployeeInfo 是子類。

我需要什么幫助 - 所以我試圖將一個 arrayList 插入到父類中，它結合了經驗和位置的資訊，并創建了一個名為 serviceList 的新 arrayList。

當我在子類中呼叫 super() 時，我應該能夠呼叫 arrayList 而不是 String 變數（經驗、位置）。

簡而言之，我應該基本上可以在子類employeeInfo方法中傳遞一個arrayList作為第三個引數而不是String經驗或String位置

父類——

public class EmployeeService () {
    private String experience;
    private String position;
    
    public EmployeeService (String experience, String position) {
        this.setExperience (experience);
        this.setPosition(position);
    }
    
    public String getExperience() {
        return experience;
    }

    public void setExperience(String experience) {
        this.experience = experience;
    }
    
    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }
    
    public String toString() {
        return "Experience - "   experience   "Position"   " - "   position;
    }
    
}

兒童班——

public class EmployeeInfo () {
    private String firstName;
    private String address;
    
    public EmployeeInfo (String firstName, String address,String experience, String position) {
        super(experience, position);
        this.setFirstName (firstName);
        this.setAddress(address);
    }
    
    public String getFirstName() {
        return firstName;
    }

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

    public void setAddress(String address) {
        this.address = address;
    }
    
    public String toString() {
        return "Name - "   firstName   "Address"   " - "   address   super.toString();
    }
}

uj5u.com熱心網友回復：

只需將屬性和額外的建構式添加到父類，如下所示：

import java.util.ArrayList;
import java.util.List;

public class EmployeeService {
    private String experience;
    private String position;
    private List<String> serviceList;

    public EmployeeService (String experience, String position) {
        this.setExperience (experience);
        this.setPosition(position);
    }

    public EmployeeService (String experience, String position, List<String> serviceList) {
        this(experience, position);
        this.serviceList = new ArrayList<>(serviceList);
    }

    public String getExperience() {
        return experience;
    }

    public void setExperience(String experience) {
        this.experience = experience;
    }

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    public String toString() {
        return "Experience - "   experience   "Position"   " - "   position;
    }
}

然后調整您的孩子班級：

import java.util.List;

public class EmployeeInfo extends EmployeeService {
    private String firstName;
    private String address;

    public EmployeeInfo (String firstName, String address, String experience, String position) {
        super(experience, position);
        this.setFirstName (firstName);
        this.setAddress(address);
    }

    public EmployeeInfo (String firstName, String address, String experience, String position, List<String> serviceList) {
        super(experience, position, serviceList);
        this.setFirstName (firstName);
        this.setAddress(address);
    }

    public String getFirstName() {
        return firstName;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String toString() {
        return "Name - "   firstName   "Address"   " - "   address   super.toString();
    }
}

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