Why is the sub class ID not extending from person1 superclass? cclass Person1{ p

Question

Why is the sub class ID not extending from person1 superclass?

cclass Person1{
private String name = "";
private String campus = "";
private int birthYear = 0;
private int age = 0;
public final int CURRENT_YEAR = 2017;

public Person1(String name, String campus, int birthYear, int age){
this.name = name;
this.campus = campus;
this.birthYear = birthYear;
this.age = age;
}
public String getName(){
return name;
}
public String getCampus(){
return campus;
}
public int getBirthYear(){
return birthYear;
}
public int getAge(){
return age;
}
public void Display(){
}
public String toString(){
return name + " " + campus + " " + birthYear + " " + age + " " + CURRENT_YEAR;
}
}
public class ID extends Person1{
private String idNum = " ";
private String lvl = " "; //Student or Staff

public ID(){
}
public String getIdNum(){
return IdNum;
}
public void setIdNum(String idNum){
this.idNum = idNum;
}
public String getLvl(){
return lvl;
}
public void setLvl(String lvl){
this.lvl = lvl;
}
}

class TestPerson{
public static void main(String[] args){
person1 person = new person(JK);

System.out.println("A person " + person.toString);
  
}
}

Explanation / Answer

Hi,

Please see below the updated classes.

Please comment for any queries/feedbacks.

Thanks.

TestPerson.java

class Person1{
   private String name = "";
   private String campus = "";
   private int birthYear = 0;
   private int age = 0;
   public final int CURRENT_YEAR = 2017;

   public Person1(String name, String campus, int birthYear, int age){
       this.name = name;
       this.campus = campus;
       this.birthYear = birthYear;
       this.age = age;
   }
   public String getName(){
       return name;
   }
   public String getCampus(){
       return campus;
   }
   public int getBirthYear(){
       return birthYear;
   }
   public int getAge(){
       return age;
   }
   public void Display(){
   }
   public String toString(){
       return name + " " + campus + " " + birthYear + " " + age + " " + CURRENT_YEAR;
   }
}
class ID extends Person1{
   private String idNum = " ";
   private String lvl = " "; //Student or Staff
   //Implicit super constructor Person1() is undefined. Must explicitly invoke another constructor
   public ID(String idNum, String lvl,String name, String campus, int birthYear, int age){
       super(name, campus, birthYear, age);
       this.idNum =idNum;
       this.lvl = lvl;
   }
   public String getIdNum(){
       return idNum;
   }
   public void setIdNum(String idNum){
       this.idNum = idNum;
   }
   public String getLvl(){
       return lvl;
   }
   public void setLvl(String lvl){
       this.lvl = lvl;
   }
}

/**
* class TestPerson
* containsmain method
* @author
*
*/
public class TestPerson{
   public static void main(String[] args){
       //Creating new Person1 object and assigning it to Person1 reference
       Person1 person1 = new Person1("JK","Campus1",2010,17);
      
       //Creating new ID object and assigning it to Person1 reference
       Person1 person2 = new ID("1001","Staff","Kevin","Campus1",2010,17); // Here ID class will get extended from Person1 class
      

       System.out.println("A person " + person1.toString());
       System.out.println("A person " + person2.toString());

   }
}

Sample output:

A person JK Campus1 2010 17 2017
A person Kevin Campus1 2010 17 2017

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