Working with LinkedList [Java] |  Free IT Certifications Data Structures

Solving LinkedList questions using two pointers

Working with LinkedList [Java] |  Free IT Certifications Data Structures

Description 

 stack: The 

 stack contains elements of the same data type. 

 You can insert and remove elements from the stack with a last-in-first-out (LIFO) policy. 

 declaration 

 stack variable_name = new Stackandlt;>(); 

 stack stack = new Stackandlt;>(); 

 method used in stack: 

 stack_name . push() - inserts an element into  the stack 

 stack_name. peek() - Peek at the top element of the stack 

 stack_name. pop() - Removes the top element of the stack 

 stack_name. size() - Returns the number of elements in the stack 

 stack_name. empty() - returns true/false. Returns true  if the stack is empty. If the stack is not empty, false 

 Stack_Name is returned. clear() - Clear the stack 

 stack_name. contains(value) - Returns true if the value you are checking exists on the stack, returns false. 

 stack_name remove(index) – Removes the value at the specified index 

 stack_name. search(value) - Finds a value in the stack and returns  the index of the value, if any. 

 Iterate Stack: You can iterate over the 

  stack elements in two ways. 

 1. Pop elements 

 You can pop  stack elements one by one to iterate over all  elements. 

 2. For each loop 

 You can iterate over the stack with a for loop like this 

 for(String s : stack_name) 

 { 

 //Stack is iterated from bottom to top like this  

 } 

 Problem 

 1. If you want parentheses or expressions to be evaluated in a particular order, you can use the stack. 

 2. If you want to use the backspace key on the keyboard or similar situations, you can use stack 

 3. If you want to clear or delete recent items, you can use Stack. 

 

. If you want to go back to something and then go forward many times, you can use Stack. 

 5. Stack can be used to find some peak elements (assuming the displayed values ​​are something like chart). You can use stack. 

 Who should take this course: 

 Developers  learning data structures and algorithms

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