Question

Java: modify the given example code to make it possible to create a student object by only specifying the name, all other info may be absent. it may also be possible to add a tag with an absent value.

import java.util.HashMap;
import java.util.Map;

public class Student
{
   private final String aName;
   private String aGender;
   private int aAge;
   private Country aCountry;
   private Map<String, String> aTags = new HashMap<>();
   
   public Song(String pName)
   {
      aName = pName;
   }
   
   public String getName()
   {
      return aName;
   }
   
   public void editTag(String pTag, String pValue)
   {
      aTags.put(pTag, pValue);
   }
}

Answer 1

import java.util.HashMap;

import java.util.Map;

class Student {

    private final String aName;

    private String aGender;

    private int aAge;

    private Country aCountry;

    private Map<String, String> aTags = new HashMap<>();

    // constructor to create Student object only by specifying name

    Student(String name) {

        this.aName = name;

        // all other values are absent

        this.aGender = "";

        this.aAge = 0;

        this.aCountry = new Country();

    }

    public Song(String pName)

    {

        aName = pName;

    }

    public String getName() {

        return aName;

    }

    public void editTag(String pTag, String pValue) {

        aTags.put(pTag, pValue);

    }

    // tag without pvalue

    public void editTag(String pTag) {

        aTags.put(pTag, "");

    }

    // setters

    void setName(String name) {

        this.aName = name;

    }

    void setAge(int age) {

        this.aAge = age;

    }

    void setCountry(Country country) {

        this.aCountry = country;

    }

    // getters

    String getName() {

        return this.aName;

    }

    int getAge() {

        return this.aAge;

    }

    Country getCountry() {

        return this.aCountry;

    }

}

.

If you want exact output for some code in main, please provide main() and Country class code.