stack implementation in java code example

Example 1: java stack

// construct with non-primative elements only!
Stack<String> stack = new Stack<String>();

// to add a value to the top of the stack:
stack.push("Hello");

// to return and remove a value from the top:
String top = stack.pop();

// to return a value without removing it:
String peek = stack.peek();

Example 2: java stack methods

import java.util.Stack<E>;
Stack<Integer> myStack = new Stack<Integer>();
myStack.push(1);
myStack.pop();
myStack.peek();
myStack.empty(); // True if stack is empty

Example 3: stack in java

// Java code for stack implementation 

import java.io.*; 
import java.util.*; 

class Test 
{ 
	// Pushing element on the top of the stack 
	static void stack_push(Stack<Integer> stack) 
	{ 
		for(int i = 0; i < 5; i++) 
		{ 
			stack.push(i); 
		} 
	} 
	
	// Popping element from the top of the stack 
	static void stack_pop(Stack<Integer> stack) 
	{ 
		System.out.println("Pop Operation:"); 

		for(int i = 0; i < 5; i++) 
		{ 
			Integer y = (Integer) stack.pop(); 
			System.out.println(y); 
		} 
	} 

	// Displaying element on the top of the stack 
	static void stack_peek(Stack<Integer> stack) 
	{ 
		Integer element = (Integer) stack.peek(); 
		System.out.println("Element on stack top: " + element); 
	} 
	
	// Searching element in the stack 
	static void stack_search(Stack<Integer> stack, int element) 
	{ 
		Integer pos = (Integer) stack.search(element); 

		if(pos == -1) 
			System.out.println("Element not found"); 
		else
			System.out.println("Element is found at position: " + pos); 
	} 


	public static void main (String[] args) 
	{ 
		Stack<Integer> stack = new Stack<Integer>(); 

		stack_push(stack); 
		stack_pop(stack); 
		stack_push(stack); 
		stack_peek(stack); 
		stack_search(stack, 2); 
		stack_search(stack, 6); 
	} 
}

Example 4: stack class in java

import java.util.Stack;
class Main {
    public static void main(String[] args) {
        Stack<String> animals= new Stack<>();
        // Add elements to Stack
        animals.push("Dog");
        animals.push("Horse");
        // Remove element from Stack
      	animals.pop();
      	// Access element from top of Stack
      	animals.peek();
    }
}

Example 5: stack implementation in c

#include <stdio.h>

int MAXSIZE = 8;       
int stack[8];     
int top = -1;            

int isempty() {

   if(top == -1)
      return 1;
   else
      return 0;
}
   
int isfull() {

   if(top == MAXSIZE)
      return 1;
   else
      return 0;
}

int peek() {
   return stack[top];
}

int pop() {
   int data;
	
   if(!isempty()) {
      data = stack[top];
      top = top - 1;   
      return data;
   } else {
      printf("Could not retrieve data, Stack is empty.\n");
   }
}

int push(int data) {

   if(!isfull()) {
      top = top + 1;   
      stack[top] = data;
   } else {
      printf("Could not insert data, Stack is full.\n");
   }
}

int main() {
   // push items on to the stack 
   push(3);
   push(5);
   push(9);
   push(1);
   push(12);
   push(15);

   printf("Element at top of the stack: %d\n" ,peek());
   printf("Elements: \n");

   // print stack data 
   while(!isempty()) {
      int data = pop();
      printf("%d\n",data);
   }

   printf("Stack full: %s\n" , isfull()?"true":"false");
   printf("Stack empty: %s\n" , isempty()?"true":"false");
   
   return 0;
}

Example 6: stack implementation

typedef struct Nodo{
   Elem val;
   struct Nodo *next;
} *Stack;
Stack Empty(){return NULL;}
bool IsEmpty(Stack a){return a==NULL;}
Elem Top(Stack a){return a->val;} 
Stack Pop(Stack l){return l->next;}
Stack Push(Elem x,Stack res){
    Stack nuevo=(Stack)malloc(sizeof(struct Nodo));
    nuevo->val=x;
    nuevo->next=res;
    return nuevo;
}