MyArrayList

[diamonddragon]

I'm experimenting with implementation of my own ArrayList class, called MyArrayList.
There is a method called add, and while doing it, wonder if I'm on the right way, or should have different approach?

    public void add(Object o) {      
        add(size, o);        
    }
    
    public void add(int index, Object o) {
        if (index > size) {
            System.err.print("Index out of bounds");
            System.exit(size - index);
        }     
        
        if (size == capacity) {    
            capacity *= 2;            
            stack = Arrays.copyOf(stack, capacity);                     
        }                           
        
        if (index != size) {
            Object[] temp = Arrays.copyOf(stack, size);
            System.arraycopy(temp, index, stack, index + 1, size - index);
        }
            
        stack[index] = o;                
        size++;
    }

[Fubarable]

I'd use exceptions rather than System.err statements.

[diamonddragon]

Wonder how Arrays class don't have method such is arraycopy?

    public void add(int index, Object o) {
         
        try {
            if (size == capacity) {    
                capacity *= 2;            
                stack = Arrays.copyOf(stack, capacity);                     
            }                           
        
            if (index != size) {
                Object[] temp = Arrays.copyOf(stack, size);
                System.arraycopy(temp, index, stack, index + 1, size - index);
            }
            
            stack[index] = o;                
            size++;            
        }
        catch (IndexOutOfBoundsException e) {    
            //
        }
    }

[Fubarable]

You will want to check into throwing an exception if something is amiss. :) Perhaps a new Exception class that you've created to go along with this class.

[diamonddragon]

I assume that means I'm on the right way.

[Fubarable]

I meant something like this:

public class MyArrayList throws MyArrayListException {
  public void add(int index, Object o) {
    if (index > size) {
        throw new MyArrayListExcetion("index " + index + " is > size");
    }

Then create a class MyArrayListException that extends Exception. You should read the Exceptions section of the tutorials to learn more. This will allow classes that use your class decide what to do if the exception is thrown. The outside classes can exit the program or can try to fix the error.