StackImplementation.JStack.java Source code

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Here is the source code for StackImplementation.JStack.java

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/*
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package StackImplementation;

import com.sun.javafx.applet.ExperimentalExtensions;
import java.util.ArrayList;
import java.util.List;
import java.util.Observable;
import java.util.Observer;
import org.apache.commons.lang3.ArrayUtils;

/**
 *
 * @author TcheutchouaSteve
 */
public class JStack extends Observable {

    private int index;
    private int MAX = 10;
    private int[] myArray;
    private static List<Observer> observerList;

    public JStack(int max) {
        this.MAX = max;
        this.myArray = new int[MAX];
        this.index = -1;
        observerList = new ArrayList<>();
        setChanged();
        notifyObservers(observerList);
    }

    // create and return a stack object
    public static JStack create() {
        JStack p = new JStack(100);
        return p;
    }

    //Take an elt and add it at the top of the stack
    public void push(int elt) {
        if (!isFull()) {
            this.myArray[this.index + 1] = elt;
            this.index++;
            //setChanged();
            notifyObservers(elt);
        }
    }

    //removes the element at the top of the stack
    public int pop() {
        if (!isEmpty()) {
            int toPop = this.myArray[index];
            this.myArray = (int[]) ArrayUtils.removeElement(this.myArray, this.myArray[index]);
            this.index--;
            //setChanged();           // mark as value changed
            notifyObservers(5); // trigger notification

            return toPop;
        } else
            throw new IndexOutOfBoundsException("The Stack is empty");
    }

    public void empty() {
        // create a new object array with the same length
        index = -1;
        //setChanged();
        notifyObservers();
    }

    public boolean isEmpty() {
        if (this.index < 0)
            return true;
        else
            return false;
    }

    public boolean isFull() {
        // array is full when the index correspond to the size of the stack
        if (this.index == this.MAX - 1)
            return true;
        else
            return false;
    }

    public int top() throws Exception {
        if (this.index < 0) {
            Exception ex = new Exception("There are no elements in top you can't " + "get the first element");
            throw ex;
        } else
            return this.myArray[this.index];
    }

    /*@Override
    public String toString() {
    String display = "" ;
    for (int i = 0; i <= index; i++) {
        display += this.myArray[i] + " ";
    }
    return  display;
    }*/

    @Override
    public synchronized void addObserver(Observer o) {
        super.addObserver(o);
        if (o != null) {
            observerList.add(o);
        }
    }

}