Difference between List and ArrayList in Java
A Collection is a group of individual objects represented as a single unit. Java provides Collection Framework which defines several classes and interfaces to represent… Read More »
Tag Archives: Java-ArrayList
How to Convert HashMap to ArrayList in Java?
HashMap is a part of Java’s collection since Java 1.2. It provides the basic implementation of the Map interface of Java. It stores the data… Read More »
How to implement our own Dynamic Array class in Java?
Given task is to implement a class in Java which behaves just like the Dynamic array using ArrayList. ArrayList is same as dynamic arrays with… Read More »
Remove first element from ArrayList in Java
Given an ArrayList collection in Java, the task is to remove the first element from the ArrayList. Example: Input: ArrayList[] = [10, 20, 30, 1,… Read More »
Removing last element from ArrayList in Java
Given an ArrayList collection in Java, the task is to remove the last element from the ArrayList. Example: Input: ArrayList[] = [10, 20, 30, 1,… Read More »
How to add selected items from a collection to an ArrayList in Java?
Given a Collection with some values, the task is to add selected the items of this Collection to an ArrayList in Java. Examples: Input: Collection… Read More »
How to add all items from a collection to an ArrayList in Java?
Given a Collection with some values, the task is to add all the items of this Collection to an ArrayList in Java. Examples: Input: Collection… Read More »
Graph Representation using Java ArrayList
Prerequisite : Graph and its representations In this article, we will be discussing Adjacency List representation of Graph using ArrayList in Java. Following is adjacency… Read More »
Sort ugly numbers in an array at their relative positions
Given an integer array arr[], the task is to sort only those elements which are ugly numbers at their relative positions in the array (positions… Read More »
Java Program to print distinct permutations of a string
Given a string str, the task is to print all the distinct permutations of str. A permutation is an arrangement of all or part of… Read More »
Java ArrayList to print all possible words from phone digits
Given a keypad of a mobile, and keys that need to be pressed, the task is to print all the words which are possible to… Read More »
Print all permutation of a string using ArrayList
Given a string str, the task is to print all the permutations of str. A permutation is an arrangement of all or part of a… Read More »
Print all subsequences of a string using ArrayList
Given a string str, the task is to print all the sub-sequences of str. A subsequence is a sequence that can be derived from another… Read More »
ArrayList toArray() method in Java with Examples
The toArray() method of ArrayList is used to return an array containing all the elements in ArrayList in the correct order. Syntax: public Object[] toArray()… Read More »
ArrayList clone() method in Java with Examples
The Java.util.ArrayList.clone() method is used to create a shallow copy of the mentioned array list. It just creates a copy of the list. Syntax: ArrayList.clone()… Read More »
