myList.java

import java.io.*;
import java.util.*;

public class myList {
	private int[] data;
    private int numItems;

    public myList() {
	data = new int[5];
	numItems=0;
    }

/* Expands the length of the array by creating a new larger array and then
copying it over. The length of the array increases by 1.5. The new integer
element is added onto the end of the array. */
    public void add(int d) {
		if (numItems>=data.length) {
		    System.out.println("Growing from "+data.length+" to "+data.length*1.5);
		    int[] tmpArray = new int[data.length+data.length/2];
		    for (int i=0;i<data.length;i++)
				tmpArray[i]=data[i];
		    data = tmpArray;
		}
    	data[numItems]=d;
    	numItems = numItems + 1;
    }

/* Removes the data item at location pos from the array data
Decreases the length of Array by 1.*/
	public int remove(int pos) {
		int removed = 0;
		removed = data[pos];
		int [] tmpArray = new int[data.length-1];
		for (int i = 0; i<pos; i++)
			tmpArray[i] = data[i];
		for (int j = pos; j<tmpArray.length; j++)
			tmpArray[j] = data[j+1];
		data = tmpArray;
		numItems = numItems - 1;
		return removed;
	}

/* Inserts data item d at location pos in the data array. Remember to
shift down items and that the array might need to grow */
	public void insert(int pos, int d){
		add(0);
		int[] tmpArray = new int[data.length];
		for (int i = 0; i<data.length; i++){
			if(i<pos)
				tmpArray[i] = data[i];
			else if (i == pos)
				tmpArray[i] = d;
			else
				tmpArray[i] = data[i-1];
		}
		data = tmpArray;
	}

//ToString returns the array followed by the number of items
	public String toString() {
			String s = Arrays.toString(data)+" : "+numItems;
			return s;
    }

}