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Stack using Array

Certification: Basic Level Accuracy: 66.67% Submissions: 12 Points: 8

Write a Java program to implement a stack using an array. The stack should support the following operations: push, pop, peek, isEmpty, and isFull.

Example 1
    

  • Input:
    push(10)
    push(20)
    push(30)
    pop()
    peek()
    • 

  • Output:
    30 popped from stack
    Top element is: 20
    • 

  • Explanation:

      

    • 30 is removed from top
      • 

    • 20 becomes new top
      • 

    

    •
Example 2
    

  • Input:
    push(10)
    isEmpty()
    push(20)
    push(30)
    isFull()
    pop()
    pop()
    pop()
    isEmpty()
    • 

  • Output:
    Stack is not empty
    Stack is not full
    30 popped from stack
    20 popped from stack
    10 popped from stack
    Stack is empty
    • 

  • Explanation:

      

    • Stack behaves correctly under various operations
      • 

    

    •
Constraints
    

  • Fixed capacity set at initialization
    • 

  • Time Complexity: O(1) for all operations
    • 

  • Space Complexity: O(n) where n is capacity
    • 

  • Must handle overflow and underflow properly
    •
ArraysEYAdobe
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Hint
Solution

Solution Hints

    
  
  • Use an array to store elements.
    • 
  
  • Keep track of the top element's index.
    • 
  
  • Implement boundary checks for push and pop operations.
    • 
  
  • For push, increment top and then add the element.
    • 
  
  • For pop, return the element and then decrement top.
    •

Steps to solve by this approach:

 Step 1: Create a class with an array, a variable to track the top element, and the maximum capacity.

 Step 2: Initialize the top index to -1 in the constructor (indicating an empty stack).

 Step 3: Implement the push method by incrementing top and then adding the element to that position.

 Step 4: Implement the pop method by returning the element at top and then decrementing top.

 Step 5: Implement the peek method to return the element at top without modifying top.

 Step 6: Implement isEmpty method to check if top is -1.

 Step 7: Implement isFull method to check if top equals maxSize-1.

Submitted Code :