User.java

import java.util.*;
public class User
{
	private String firstName;
	public String lastName;
	
	static void log(Object o)
	{
		System.out.print(o);
	}

	static void logln(Object o)
	{
		System.out.println(o);
	}



	public String getFullName()
	{
		return getFirstName() + " "  + lastName.toUpperCase();
	}

	public String output()
	{
		return "Hi, my name is "+ getFirstName() + " "  + getLastName() + ".";
	}
	
	
	public String getFirstName()
	{
		return firstName;
	}

	//Setter not returning anything ∴ void
	public void setFirstName(String fN)
	{
	    /*
		if(fN == null)
		{
		    logln("It's null");
		}
		*/ //Not Null I tried running it
		
		//Assigning the fName value we pass in to the field firstName
		firstName=fN.trim();
		//the .strip remove any whitespaces before output.
		
	}

	public String getLastName()
	{
		return lastName;
	}

	//Setter not returning anything ∴ void
	public void setLastName(String lN)
	{
		//Assigning the lN value we pass in to the field lastName
		lN=lastName;
	}
	

	public static void printUsers(List<User> users)
	{
		//I want to iterate through the users
		//For each User o in users)
		for(User o:users)
		{
			logln(o.getFullName());
		}
	}

	//return type will be User. However we cannot have the same parameters. This
	//will not be a valid overload. So we either have to name it differently or change
	//parameter list
	public static User searchForUser(List<User> users, User o)
	{
		//Creating a for Each loop. (For each user in the users list of Type User)
		for(User user:users)
		{
			if(user.equals(o))
			{
				return user;
			}
		}
		//If we loop through and find nothing then we return null;
		return null;

	}

	public static int searchList(List<User> users, User o)
	{
		return searchList(users, o.getFullName());
	}

	public static int searchList(List<User> users, String fN, String lN)
	{
		return searchList(users, fN + " "  + lN);
	}

	//OVERLOAD
	public static int searchList(List<User> users, String fullName)
	{
		//iterate through the list
		for(int i=0;i<users.size();i++)
		{
			//Use .equals instead of ==
			if(users.get(i).getFullName().equals(fullName))
			{
				return i;
			}
		}

		//if no match
		return -1;//because return type in method is an integer
	}
	
	/*
	public void changeSth(int x)
	{
		x++;
	}
	*/

	public void changeSth(User x)
	{
		x.setFirstName(“Roberto”);
	}


	//Now I will override the ToString
	@Override
	public String toString()
	{
		//To override remember to give the method to override the same name
		return "  " + getFullName() + "]";
	}

	//Intended to put obj in a hash table ∴ turn the hash code into a number
	@Override
	public int hashCode()
	{
		final int prime = 19;
		int res = 1;
		res= prime * res + ((firstName==null) ? 0 : firstName.hashCode());
		res= prime * res + ((lastName==null) ? 0 : lastName.hashCode());
		return res;
	 }

    	@Override
    	public boolean equals(Object obj)
    	{
		if(this == obj)
			return true;
		if(obj == null)
			return false;
		if(getClass() != obj.getClass())
		{
			return false;
		}
		User other = (User) obj;
        
		if(firstName == null)
 		{
			if(other.firstName != null)
			{
				return false;
			} 
		} 
	
		else if(!firstName.equals(other.firstName))
			return false;
	
		if(lastName == null)
		{
			if(other.lastName != null)
				return false; 
    		}	 
    
		else if(!lastName.equals(other.lastName))
			return false;
    	
		return true;	

	}
}