hello/java/samples/java-packages/source/Stack.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package lang;

/**
 *
 * @author (C)Y.D.Zakovryashin, 07.11.2022
 */
public class Stack <T> {

    public final int DEFAULT_SIZE = 128;
    private T[] stack;
    private int top;

    public Stack(T[] stack) {
//        size = size < 1 ? DEFAULT_SIZE : size;
        this.stack = stack;
        top = 0;
    }

    public void push(T x) throws FullStackException {
        if (top == DEFAULT_SIZE) {
            throw new FullStackException();
        }
        stack[top] = x;
        ++top;
    }

    public T pop() throws EmptyStackException {
        if (top < 1) {
            throw new EmptyStackException();
        }
        return stack[--top];
    }
}