java setter / getter

import java.util.Scanner;

class TeamName {
	private String name; //private hides from other classes in the package
	private String NameGet;
	//public shows to all package
	
	//this will run without any argument passed to it
	public TeamName(){
		System.out.println("cunstructor without argument");
	}
	//prints team name // new TeamName("team");
	public TeamName(String name){
		String nameGetter;
		Scanner in = new Scanner(System.in);
		System.out.println("Please enter a team name");
		nameGetter = in.nextLine();
		System.out.println("Welcome " + nameGetter);
		in.close();
	}
}
class GetName {
	public String defaultName;
	
	public GetName(String defaultName) {
		System.out.println(defaultName); //display current team name
	}
}
class  SetName {
	public SetName(String defaultName) {
		System.out.println(defaultName); //print result
	}
}
public class Team {
	public String nameSetter;
	public static void main(String[]args){
		new TeamName();
		new TeamName("team");
		
		
		String defaultName = "unknown Team";
		GetName theNewName = new GetName(defaultName);
		
		
		//String defaultName;
		Scanner in = new Scanner(System.in);
		System.out.println("Please enter a team name");
		defaultName = in.nextLine();
		
		
		System.out.println("Welcome " + defaultName);
		in.close();
		
		
	}
	public String getNameSetter() {
		return nameSetter;
	}
	public void setNameSetter(String nameSetter) {
		this.nameSetter = nameSetter;
	}
}

public class Team {

	private String teamName;
	private int teamID;
	
	public Team() {
	
		this.teamName = "Team1";
		this.teamID = 123;
	}
	
	public void setTeamName(String teamName) {
	
		this.teamName = teamName;
	}
	
	public String getTeamName() {
	
		return this.teamName;
	}
	
	public void setTeamID(int teamID) {
	
		this.teamID = teamID;
	}
	
	public int getTeamID() {
	
		return teamID;
	}
}

public class Test {

	public static void main(String[] args) {
	
		Team t = new Team();
		
		// now, because you can't use t.teamName = "something" or t.teamID = something, you need to use the setter Method
		t.setTeamName("Team epvp");
		t.setTeamID(1337);
		
		// now, you can't use System.out.println("" + t.teamName + " " + t.teamID) you need to use the getter Methods to get the values of the variables
		System.out.println("" + t.getTeamName() + " " + t.getTeamID());
	}
}

Write a Team class to encapsulate the concept of a Team.
The team has only one attribute, the team name.
Include the following:
Constructors: One that takes no arguments and one that takes the Team name.
Add a getter/assessor method and a mutator/setter method that follow the standard naming conventions based on the field name you use to store the team name.
Add an override of the toString method (You must use the @Override annotation).
Add an override of the equals method (You must use the @Override annotation).
Add any other methods that should be in this class.

public class Team {

	private String teamName;
	
	public Team() {
	
		this.teamName = "Team1";
	}
	
	public Team(String teamName) {
	
		this.teamName = teamName;
	}
	
	public void setTeamName(String teamName) {
	
		this.teamName = teamName;
	}
	
	public String getTeamName() {
	
		return this.teamName;
	}
	
	@Override
	public String toString() {
		
		return "Team name: " + this.teamName;
	}
	
	@Override
	public boolean equals(Object o) {
		
		if(this.teamName == ((Team)o).getTeamName()){
			
			return true;
		}
		return false;
	}
	
	@Override
	public int hashCode() {
		
		final int prime = 31;
		int result = 1;
		
		result = prime * result + ((this.teamName == null) ? 0 : this.teamName.hashCode());
		
		return result;
	}
	
	/*
	// Or you can generate the hashcode using Apache HashCodeBuilder
	@Override
	public int hashCode() {
		HashCodeBuilder builder = new HashCodeBuilder();
		builder.append(this.getTeamName());
		return builder.toHashCode();
	}
	*/
}

public class Animal {
	
	public Animal() {}
	
	public void move() {
		
		System.out.println("Animal moves!");
	}
}

public class Cat extends Animal {

	public Cat() {}
	
	public void move() {
		
		System.out.println("Cat moves!");
	}
	
	public void miau() {
		
		System.out.println("miauuuu");
	}
}

public class Test {
	
	public static void main(String[] args) {
		
		Animal a = new Animal();
		Animal c = new Cat();
		
		a.move();
		c.move();
	}
}

Animal moves!
Cat moves!

public class Test {
	
	public static void main(String[] args) {
		
		Animal a = new Animal();
		Animal c = new Cat();
		
		a.move();
		c.move();
		c.miau(); // we add this here
	}
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	The method miau() is undefined for the type Animal

public class Cat extends Animal {

	public Cat() {}
	
	@Override
	public void move() {
		
		System.out.println("Cat moves!");
	}
	
	@Override
	public void miau() { // now you get here an error because this method doesn't exist in Animal
		
		System.out.println("miauuuu");
	}
}

The method miau() of type Cat must override or implement a supertype method