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;
    }

    public void add(int d) {        
        if (numItems>=data.length) {
            System.out.println("Growing from "+data.length+" to "+data.length*1.5);
            // "grow" the array by creating a new one and copying over
            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;
    }
    
    public String toString() {
        String s = Arrays.toString(data)+" : "+numItems;
        return s;
    }
  
public void insert(int pos, int d) {
 // inserts data item d at location pos in the data array
 // remember we have to shift down items to make room and
 // we might have to grow the array
  int[] result = new int [data.length + 1];
        for (int i = 0; i < data.length; i++){
            if (pos > i){
                result [i] = data[i];}
            else{
                if (pos == i){
                    result[pos] = d;}
                else {
                    result[i + 1] = data[i];}}}
        data = result;
}
}