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package stack;

import java.util.ArrayList;

import java.util.EmptyStackException;

public class MyStack<T> {

ArrayList<T> arr = new ArrayList<T>();

int size = 0;

public MyStack() {

}

public T push(T element) {

arr.add(element);

size++;

return element;

}

public T pop() {

if (isEmpty()) {

throw new EmptyStackException();

}

T element = arr.get(size-1);

arr.remove(size -1);

size--;

return element;

}

public T peek() {

if (isEmpty()) {

throw new EmptyStackException();

}

return arr.get(size - 1);

}

public boolean isEmpty() {

if (size == 0) {

return true;

} else {

return false;

}

}

public int size() {

return size;

}

public int search(T element) {

int distance = 1;

for (int i = size - 1; i >= 0; i++) {

if (arr.get(i).equals(element)) {

distance = size - i;

return distance;

}

}

return -1;

}

public String toString() {

if (isEmpty()) {

return null;

}

StringBuilder str = new StringBuilder("[");

for (int i = 0; i< size - 1; i++) {

str.append(arr.get(i));

str.append(", ");

}

str.append(arr.get(size - 1));

str.append("]");

return str.toString();

}

}