flashcard-java-10-ArraysAndArrayList.md

layout	flashcard-topic
title	Arrays & ArrayList
main_card_title	Java Arrays & ArrayList
main_card_bg	#6586c3
card_bg	#9aacd5
cards	title description Array A collection of similar elements stored in contiguous memory locations title description Declaring an array int arr[] = new int[5]; title description Declaring and Initializing an array int arr2[] = { 25, 30, 50, 10, 5 }; title description array length method Returns the number of elements in an array in Java. title description Print Array Element System.out.println( marks[0]); title description Arrays.toString (arr) Returns a string representation of the contents of an array. title description ArrayIndexOutOfBounds Exception An error that occurs when an invalid index is used to access an array element title description Arrays.fill(marks, 100) Assigns a value of 100 to all elements of the marks array. title description Arrays.equals(arr1, arr2) Compares if two arrays have the same elements in the same order. title description Arrays.sort(marks); Sorts an array in ascending order. title description ArrayList Resizable array implementation, that allows insertion and deletion operations. title description arrayList. add("XYZ") Adds an element to the end of an ArrayList in Java. title description arrayList. remove("XYZ") Removes the first occurrence of the element "XYZ" from the ArrayList. title description Array vs ArrayList An array has a fixed size while an ArrayList has a dynamic size