Stacks

Instantiating a stack

import java.util.Stack;

Stack<Integer> stack = new Stack<>();

• Adding to the top of the stack - .push()

  stack.push(10);
  stack.push(20);
  stack.push(30);
  

• Inspecting the item on the top of the stack - .peek()

  stack.peek(); // returns 30
  

• Removing the item on the top of the stack - .pop()

  stack.pop();
  

• Inspecting the size of the stack - .size()

  stack.size();