I've been programming for quite a bit now, but I have a problem. What I am trying to do is implement a class which has the same capabilities as a built-in data type int[].
The following methods were provided for me:
public ArrayOfInt(int size);
public int length();
public int get(int index);
public void put(int index, int value);
The main method is for testing the code.
I pretty much have no idea where to start. Can somebody help me?
Edit: Here's my updated code. When I try to use d.put(0,1), I get a nullpointerexception error, which is what I'm now confused about. Shouldn't d.put(0,1) define the index and value integers?
public class ArrayofIntegers
{
private int[] arr;
public int ArrayOfInt(int size)
{
arr = new int[size];
return size;
}
public int length()
{
return arr.length;
}
public int get(int index)
{
return arr[index];
}
public void put(int index, int value)
{
arr[index]=value;
System.out.print(arr[index]=value);
}
public static void main(String[] args)
{
ArrayofIntegers d = new ArrayofIntegers();
d.put(0,1);
}
}
you can make use of all the methods given to you by creating an ArrayList of Integers as answered by ADAM below.
