A stack for everyone

[mohayemin]

Overview

The code below implements a very simple stack. It can only store integer data type. Can you change it so that it can store any data types?

// Language: Java
public class SimpleStack {
    private int[] container;
    private int topIndex;
    
    public SimpleStack(int size) {
        container = new int[size];
    }

    public void push(int item) {
        topIndex++;
        container[topIndex] = item;
    }

    public int pop() {
        int item = container[topIndex--];
        return item;
    }
}

Assumptions

The implementation is intentionally simple. Adding additional validations are not focus of this problem.

Task

Change the code such a way that it can support any data type.

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Reminders

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