Myujth

I'm new to Java and I'm trying to get my head around constructs, classes and objects. I apologise if any of this seems stupid to you.

I have been tasked with creating an ArrayList to hold items of type Data (my class). using the .add method - I should add a certain number of names and ages then output.

I have sort of done it, but I was wondering if I could use the functions like SetAge and SetAge from my class to use within my ArrayList to create a new person and then output it together like I have with the rest. Is there another way?

Thank you for your help & explanation.

Below is my code;

import java.util.ArrayList;

public class workingOn 

public static void main (String args)

 Data Fred = new Data("Fred", 21);
 Data Jo = new Data("Jo", 43);
 Data Zoe = new Data("Zoe", 37);

 ArrayList<Data> myArray = new ArrayList<Data>();

 myArray.add(Fred);
 myArray.add(Jo);
 myArray.add(Zoe);

 for (Data temp : myArray) 
 
 System.out.println(temp.toString()); 
 

Below is my class;

 public class Data 

 private String name;
 private int age;

 Data(String n,int a)
 
 name = n;
 age = a;
 
 public String GetName()
 
 return(name);
 
 public void SetName(String n)
 
 name = n;
 
 public int GetAge()
 
 return(age);
 
 public void SetAge(int a)
 
 age = a;
 
 public void Print()
 
 System.out.print(("("+ GetName() ));
 System.out.print(",");
 System.out.print(GetAge());
 System.out.print(") ");
 

 //i made this so I don't output the object id
 public String toString() 
 return (name + ", " + age);


 
 

Going through the comments, I am guessing you want to somehow use the setter methods (setName() and setAge()) for the class that you have designed. The easiest way would be:

Data d = new Data("tempName", 10);
myArray.add(d);

This basically creates an object of type Data and adds it to the arraylist. Let's assume that you want to change the name and age of this person you just added, then you should do this:

myArray.get(myArray.size() - 1).setName("newName");
myArray.get(myArray.size() - 1).setAge(18);

To add some explanation, when you add an object to an arraylist, it always adds in the end. We use size() method to get the number of objects in the Arraylist. Since index starts from 0, we use myArray.size() - 1. We use the .get() method to retrieve the object from the arraylist which takes a number as a parameter and return the object at that index.

Combining these two, we get the object at the last possible index, and call the setName() and setAge() function on it.
Hope this helps.