Ex_1_3_07.md

title	Algorithm4 Java Solution 1.3.07
date	2019-07-04 05:47:10 +0800
draft	false
tags	JAVA
categories	TECH archives

1.3.07

Problem:

Add a method peek() to Stack that returns the most recently inserted item on the stack (without popping it).

Solution：

  public static void main(String[] args) {
    _Stack<Integer> s = new _Stack<>();
    s.push(1);
    s.push(2);
    s.push(3);
    s.push(4);
    assert s.peek() == 4; // pass
  }

Reference：