#java#，练习题2

Question

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

public class Father { 

public String name; 
public int age; // customer name 
Father(){ name=”Hassan”; age=50;}

public void display(){ System.out.println(“Name:”+name);
                                      System.out.println(“Age:”+age);
} }

遇到的问题

我想要达到的结果

Answer 1

Father‘s info :
Name:Hassan
Age:50
Child‘s info :
Name:Ariqa
Age:21
Location :KL

Answer 2

public class Father {
    private String name;
    private Integer age;
    
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public Father(String name, Integer age) {
        this.name = name;
        this.age = age;
    }
    public Father(){}
    public void display() {
        System.out.println("Father‘s info :");
        System.out.println("Name:"+this.name);
        System.out.println("Age:"+this.getAge());
    }
}

Answer 3

public class Child extends Father{
    private String location;

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }
    public Child() {}

    public Child(String name, Integer age, String location) {
        super(name, age);
        this.location = location;
    }
    public void display() {
        System.out.println("Child‘s info :");
        System.out.println("Name:"+this.getName());
        System.out.println("Age:"+this.getAge());
        System.out.println("Location :"+this.getLocation());
    }
    
}

Answer 4

public class Main {
    public static void main(String[] args) {
        Father fa=new Father("Hassan",50);
        Child ch=new Child("Ariqa",21,"KL");
        fa.display();
        ch.display();
    }
}