Adding Several Methods to ArrayStack

Array Stack
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Description
The ArrayStack class does not need to have a main method. The ArrayStack is a class in the package that can be used by making objects of the class. There can be multiple such classes that can be initiated using constructors of the objects. Thus, the overall package will have a main method in order to call the constructor methods of these classes initiated in the package, but the ArrayStack will not have a main method in itself.
Code
package learn;
import java.util.EmptyStackException;
public class ArrayStack {
private int arr[];
private int size;
private int index = 0;
public ArrayStackStack(int size) {
this.size = size;
arr = new...