Defining an Interface for a Class - Java Object Oriented Design

Java examples for Object Oriented Design:interface

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Introduction

Create a Java interface with the fields and methods that a class must implement.

The interface can be implemented by a class, and used to represent an object type.

Demo Code


import java.util.List;

interface TeamType {

  void setPlayers(List<Player> players);

  void setName(String name);

  void setCity(String city);

  String getFullName();/*w w w.  j  av  a2 s.c  o  m*/

}


public class Main {

  public static void main(String[] args) {
    TeamType team1 = new Team();
    team1.getFullName();
  }
}

class Player {

  private String firstName;
  private String lastName;
  private String position;
  private int status = -1;

  public Player() {

  }

  public Player(String position, int status) {
    this.position = position;
    this.status = status;
  }

  public String playerString() {
    return getFirstName() + " " + getLastName() + " - " + getPosition();
  }

  /**
   * @return the firstName
   */
  public String getFirstName() {
    return firstName;
  }

  /**
   * @param firstName
   *          the firstName to set
   */
  public void setFirstName(String firstName) {

      this.firstName = firstName;
  }

  /**
   * @return the lastName
   */
  public String getLastName() {
    return lastName;
  }

  /**
   * @param lastName
   *          the lastName to set
   */
  public void setLastName(String lastName) {
    this.lastName = lastName;
  }

  /**
   * @return the position
   */
  public String getPosition() {
    return position;
  }

  /**
   * @param position
   *          the position to set
   */
  public void setPosition(String position) {
    this.position = position;
  }

  /**
   * @return the status
   */
  public int getStatus() {
    return status;
  }

  /**
   * @param status
   *          the status to set
   */
  public void setStatus(int status) {
    this.status = status;
  }
}

class Team implements TeamType {

  private List<Player> players;
  private String name;
  private String city;

  /**
   * @return the players
   */
  public List<Player> getPlayers() {
    return players;
  }

  /**
   * @param players
   *          the players to set
   */
  public void setPlayers(List<Player> players) {
    this.players = players;
  }

  /**
   * @return the name
   */
  public String getName() {
    return name;
  }

  /**
   * @param name
   *          the name to set
   */
  public void setName(String name) {
    this.name = name;
  }

  /**
   * @return the city
   */
  public String getCity() {
    return city;
  }

  /**
   * @param city
   *          the city to set
   */
  public void setCity(String city) {
    this.city = city;
  }

  public String getFullName() {
    return this.name + " - " + this.city;
  }

}

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