Sunday 25 May 2014

LinkedList : pop : Pop Element from the stack

public E pop()
Removes and returns the first element of this list. This method is equivalent to removeFirst().

import java.util.*;

class LinkedListPop{
 public static void main(String args[]){
  LinkedList<Integer> myList;
  myList = new LinkedList<> ();
  
  /* Add Elements to myList */
  myList.add(10);
  myList.add(20);
  myList.add(30);
  myList.add(40);
  
  System.out.println("Elements in myList are");
  System.out.println(myList);
  
  System.out.print("Pop removes element ");
  System.out.println(myList.pop());
  
  System.out.println("Elements in myList are");
  System.out.println(myList);
 }
}

Output
Elements in myList are
[10, 20, 30, 40]
Pop removes element 10
Elements in myList are
[20, 30, 40]

1. Throws NoSuchElementException if this list is empty
import java.util.*;

class LinkedListPopNoSuch{
 public static void main(String args[]){
  LinkedList<Integer> myList;
  myList = new LinkedList<> ();
  
  
  System.out.println("Elements in myList are");
  System.out.println(myList);
  
  System.out.print("Pop removes element ");
  System.out.println(myList.pop());
  
 }
}

Output
Elements in myList are
[]
Pop removes element Exception in thread "main" java.util.NoSuchElementException
        at java.util.LinkedList.removeFirst(LinkedList.java:268)
        at java.util.LinkedList.pop(LinkedList.java:799)
        at LinkedListPopNoSuch.main(LinkedListPopNoSuch.java:13)


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