Java Usage

Part 1

class Worldcup { //superclass
    int wins = 0;        
    int losses = 0;                   
    boolean popular = true;
    String jersey_color = "blue";

    public Worldcup(int wins, int losses, boolean popular, String jersey_color){
        this.wins = wins;
        this.losses = losses;
        this.popular = popular;
        this.jersey_color = jersey_color;
    }

    public String toString(){
        return "Wins: " + this.wins + ", Losses: " + this.losses + ", Popular?: " + this.popular + ", Jersey Color: " + this.jersey_color;
    }

  }
  
public class Argentina extends Worldcup{
public Argentina(int wins, int losses, boolean popular, String jersey_color){
    super(wins, losses, popular, jersey_color); // superclass constructor
}
public static void main(String[] args) {
    Argentina argentina_obj = new Argentina(3,1,true,"blue");
    System.out.println(argentina_obj);
}
}


public class Brazil extends Worldcup{
    public Brazil(int wins, int losses, boolean popular, String jersey_color){
        super(wins, losses, popular, jersey_color); // superclass constructor
    }
    public static void main(String[] args) {
        Brazil brazil = new Brazil(7,9,true,"yellow");
        System.out.println(brazil);
    }
    }

public class Morroco extends Worldcup{
    public Morroco(int wins, int losses, boolean popular, String jersey_color){
        super(wins, losses, popular, jersey_color); // superclass constructor
    }
    public static void main(String[] args) {
        Morroco Morroco = new Morroco(2,0,false,"orange");
        System.out.println(Morroco);
    }
    }


public class France extends Worldcup{
    public France(int wins, int losses, boolean popular, String jersey_color){
        super(wins, losses, popular, jersey_color); // superclass constructor
    }
    public static void main(String[] args) {
        France France = new France(0,10,true,"red");
        System.out.println(France);
    }
    }


public class Croatia extends Worldcup{
    public Croatia(int wins, int losses, boolean popular, String jersey_color){
        super(wins, losses, popular, jersey_color); // superclass constructor
    }
    public static void main(String[] args) {
        Croatia Croatia = new Croatia(90,0,false,"dark blue");
        System.out.println(Croatia);
    }
    }


  Argentina.main(null);
  Brazil.main(null);
  Morroco.main(null);
  France.main(null);
  Croatia.main(null);

Wins: 3, Losses: 1, Popular?: true, Jersey Color: blue
Wins: 7, Losses: 9, Popular?: true, Jersey Color: yellow
Wins: 2, Losses: 0, Popular?: false, Jersey Color: orange
Wins: 0, Losses: 10, Popular?: true, Jersey Color: red
Wins: 90, Losses: 0, Popular?: false, Jersey Color: dark blue

Part 2

public class Person {
    public String name;
    public int birthday_year;
 
    public Person (String name, int birthday_year){
       this.name = name;
       this.birthday_year = birthday_year;
    }
 
    public String getName(){
       return name;
    }

    public int getAge(){
        return (2022 - birthday_year);
     }

     public String toString(){
      return "Name: " + this.name + ", Birth Year: " + this.birthday_year + ", Age: " + this.getAge();
  }
 }
 
 public class Student extends Person {
    private int grade;
    private double gpa;
    private double hours;
 
    public Student (String name, int birthday_year, int grade, double gpa, double hours) {
       super(name, birthday_year);
       this.grade = grade;
       this.gpa = gpa;
       this.hours = hours;
    }

    public double hours_of_hw(double hours){
      return hours;
    } 

 
    public int getGrade(){
       return grade;
    }

    @Override
    public String toString() {
         return "Name: " + this.name + ", birthday: " + this.birthday_year + ", grade: " + this.grade +", gpa: " + this.gpa +", hours of hw: " + this.hours;
    }
 }



 public class Aadya extends Student{
   public Aadya(String name, int birthday_year, int grade, double gpa, double hours){
       super(name, birthday_year, grade, gpa, hours); // superclass constructor
       getGrade();
       getName();
       getAge();
       hours_of_hw(hours);
   }

   public double hours_of_hw(double hours){
      return hours;
    } 
   public static void main(String[] args) {
      Aadya aadya_obj = new Aadya("Aadya", 2006, 11, 4.3, 6.5);
      System.out.println(aadya_obj);
  }
}


public class Teacher extends Person {
   private String subject;
   private int years_of_teaching;
   private boolean popular;
   private String college;

   public Teacher (String name, int birthday_year, String subject, int years_of_teaching, boolean popular, String college) {
      super(name, birthday_year);
      this.subject = subject;
      this.years_of_teaching = years_of_teaching;
      this.popular = popular;
      this.college = college;
   }

   public String getSubject() {
      return subject;
   }

   public int years_of_teaching() {
      return years_of_teaching;
   }

   // return degree
   public String getCollege_name() {
      return college;
   }

   @Override
   public String toString() {
         return "Name: " + this.name + ", birth year: " + this.birthday_year + ", subject: " + this.subject + ", Popular? : " + this.popular + ", Years of Teaching :" + this. years_of_teaching + ", College Name :" + this.college;
   }

}


public class Liao extends Teacher{
   public Liao(String name, int birthday_year, String subject, int years_of_teaching, boolean popular, String college){
       super(name, birthday_year, subject, years_of_teaching, popular, college); // superclass constructor
   }

   public static void main(String[] args){
      Liao liao = new Liao("Frank Liao", 1965, "Physics", 30, true, "UCSD");
      System.out.println(liao);
   }
}



Aadya.main(null);
Liao.main(null);

Name: Aadya, birthday: 2006, grade: 11, gpa: 4.3, hours of hw: 6.5
Name: Frank Liao, birth year: 1965, subject: Physics, Popular? : true, Years of Teaching :30, College Name :UCSD