java howto ArrayList push pop shift and unshift

Question

I ve determined that a Java ArrayList add is similar to a JavaScript Array push  I m stuck on finding ArrayList functions similar to the following   Array pop Array shift Array unshift I m leaning toward ArrayList remove At

User · Answer

I was facing with this problem some time ago and I found java util LinkedList is best for my case  It has several methods  with different namings  but they re doing what is needed   push      - gt  LinkedList addLast       Or just LinkedList add    pop       - gt  LinkedList pollLast    shift     - gt  LinkedList pollFirst    unshift   - gt  LinkedList addFirst

User · Answer

maybe you want to take a look java util Stack class  it has push  pop methods  and implemented List interface   for shift unshift  you can reference  Jon s answer   however  something of ArrayList you may want to care about   arrayList is not synchronized  but Stack is   sub-class of Vector    If you have thread-safe requirement  Stack may be better than ArrayList

User · Answer

Great Answer by Jon    I m lazy though and I hate typing  so I created a simple cut and paste example for all the other people who are like me  Enjoy   import java util ArrayList  import java util List   public class Main        public static void main String   args             List lt String gt  animals   new ArrayList lt  gt              animals add  Lion            animals add  Tiger            animals add  Cat            animals add  Dog             System out println animals       Lion  Tiger  Cat  Dog              add   - gt  push    Add items to the end of an array         animals add  Elephant            System out println animals        Lion  Tiger  Cat  Dog  Elephant              remove   - gt  pop    Remove an item from the end of an array         animals remove animals size   - 1           System out println animals       Lion  Tiger  Cat  Dog              add 0  xyz   - gt  unshift    Add items to the beginning of an array         animals add 0   Penguin            System out println animals       Penguin  Lion  Tiger  Cat  Dog              remove 0  - gt  shift    Remove an item from the beginning of an array         animals remove 0           System out println animals       Lion  Tiger  Cat  Dog

User · Answer

Underscore-java library contains methods push values   pop    shift   and unshift values    Code example   import com github underscore U   List lt String gt  strings   Arrays asList  one    two     three    List lt String gt  newStrings   U push strings   four    five         one     two    three     four    five   String newPopString   U pop strings  fst         three  String newShiftString   U shift strings  fst        one  List lt String gt  newUnshiftStrings   U unshift strings   four    five         four     five    one     two    three

User · Answer

ArrayList is unique in its naming standards  Here are the equivalencies   Array push    - gt  ArrayList add Object o      Append the list Array pop     - gt  ArrayList remove int index      Remove list index  Array shift   - gt  ArrayList remove 0      Remove first element Array unshift - gt  ArrayList add int index  Object o      Prepend the list   Note that unshift does not remove an element  but instead adds one to the list  Also note that corner-case behaviors are likely to be different between Java and JS  since they each have their own standards

[java] java howto ArrayList push, pop, shift, and unshift

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