DynamicArray

package classes_and_objects;
public class DynamicArray {
	int d[];
	int nextIndex;
	DynamicArray(){
		d=new int[5];
		nextIndex=0;
	}
	public int size() {
		return nextIndex;
	}
	public boolean isEmpty() {
		return size()==0;
	}
	public void add(int i) {
		if(nextIndex==d.length) {
			restructure();
		}
		d[nextIndex]=i;
		nextIndex++;
	}
	private  void restructure() {
	   int temp[]=d;
	   d=new int[d.length*2];
	   for(int i=0;i<temp.length;i++) {
		   d[i]=temp[i];
	   }
		
	}
	public void set(int index,int value) {
		if(index>nextIndex)
			return;
		else if(index<nextIndex)
			d[index]=value;
		else
			add(value);

	}
	public int get(int index) {
		if(index>=nextIndex){
    //error out
			return -1;}
		else
			return d[index];
	}

	private int removeLast() {
		if (size() == 0) {
			// error out
			return -1;
		}
		int value = d[nextIndex - 1];
		d[nextIndex - 1] = 0;
		nextIndex--;
		return value;
	}



	public static void main(String[] args) {
		DynamicArray d=new DynamicArray();
		for(int i=0;i<100;i++) {
			d.add(i+10);
		}
		System.out.println(d.size());

		d.set(4, 10);
		System.out.println(d.get(3));
		System.out.println(d.get(4));

		while (!d.isEmpty()) {
			System.out.println(d.removeLast());
			System.out.println("size = " + d.size());
		}
	}

}