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Java Vector

Java Vector is the implementation class to the List interface. It is almost equivalent to the ArrayListimplementation class except the synchronization , Java Vector is thready safety ( Synchronized class). Stack is the child class to Vector class. Vector doesn’t comes under general purpose implementation classes , Vector class is also known to be called as Legacy class because it is introduced in…

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Java LinkedList

class LinkedList<E>

java.lang.object

java.util.Abstractcollection

java.util.AbstractList

java.util.AbstractSequentialList

java.util.LinkedList<E>

<E> –> The type of elements held in this collection

All known implemented interfaces

Serializable , Cloneable , Iterable<E> , Collection<E> , Deque<E> , List, Queue

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Java ArrayList

class ArrayList<>

All implemented Interfaces

Serializable , Cloneable , Iterable<E> , Collection <E> , List<E> , RandonAccess

Direct Known sub-classes

AttributeList , RoleList , RoleUnsolvedList

Java ArrayList is one of the implementing classes to List interface. Due to it’s resizable nature , ArrayList is also known as ‘Resizable-array’ implementation. All the methods in Collectionand List…

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#arraylist new capacity formula #arraylist synchronization #arraylist tutorial #fail-fast iterator #fail-safe iterator #java arraylist class #java arraylist constructors #java arraylist example #java arraylist methods #randomaccess interface #randomaccess marker interface

List Interface

First thing to mention about List interface is , List is a child interface to Collection interface. List is an ordered collection which is introduced in 1.2v of Java . List interface is also known to be Sequence collection. The hierarchy of List interface is shown below

public Interface List<>

All Super Interfaces ( extends)

Collection , Iterable

All known implementing classes

AbstractList,…

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#collections tutorial #Fail-fast #implementation classes in list interface #list interface #list interface tutorial #ListIterator interface #listIterator method #subList

Java Collections Class

Java Collections class is a utility class present in java.util package. This class consist exclusively of static methods that operate on collections object or returns collections(group of elements). Because it is a utility class , it contains polymorphic algorithms that operate on collections wrappers which returns a new collection backed by a specific collection.

The…

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Collection Interface

A collection is an object which represents a group of objects as it’s elements. To manipulate these collections(objects) the Collection interface provides some basic operations like add() , remove() methods and also sub-interfaces like Set and List and so on. Collection interface does not provide any direct implementation classes like other sub interfaces Set , List etc , but it provides core…

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Collections Framework

Java Collections Framework

The Java platform includes Collections Framework. A collection is an object that represents a group of objects. Collection framework is unified architecture for representing and manipulating collections , enabling collections to be manipulated independently by using implementation details. To represent a group of individual objects as a single entity we need to use of…

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Array Limitations

Limitations of an Array

The major drawback for an array is , arrays are fixed in size. There’s no point of increasing the size of an array after its creation.

Therefore , the programmers should know the size of an array in advance which is quite complex in real time programming.

Arrays are homogeneous , i.e arrays holds only one type of data. An integer array cannot hold a string value and vice…

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#array fixed in size #java arrays limitations #limitations of arrays

Sample Array program

The following sample array program creates an array of integers , put some values and prints to the standard output

class ArrayDemo { public static void main(String[] args) { // declares an array of integers int[] anArray; // allocates memory for 10 integers anArray = new int[10]; // initialize first element anArray[0] = 100; // initialize second element anArray[1] = 200; // and so forth…

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Declaring an Array

Declaring array does not actually creates an array , it simply tells the compiler that this variable is holding a specified type of array.

Like declaration of variables of other types , an array declaration has two components : the array’s type and the arrays’ name.

The array’s type is written as type[] , where typeis the data type of the contained elements. The square…

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Java Arrays

Java Arrays Introduction

In Java we can store a single value in the form of a variable ( for example int x = 10; or String name = “Java”; ). In this way we can store a single element or a value in a variable and we can access that value by calling that variable. What if our requirement needs a 1000 values while programming , creating 1000 variables for those 1000 values will be complex and…

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#array index #array introduction #java arrays #one dimensional array

Summary of chapter 1. creating a class , method. Different types of data types. variable declaration and initialization. How to print output using println.

#variables

Summary

Let’s celebrate , we have completed the first phase of our Java course. Till now we have learned the theory part of the basic program structure , without a class , method , variables and println() method a java program is incomplete. Here the summary of your credit of learning.

Summary Java – Class

In Java a class is created by opening and closing curly braces ‘{ }’

A class will have fields ,…

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#class #data types #method #println()#summary #variables

We made it , you execute the course. Happy Learning ! Things to Know? Why Java? Where to write your Java program? Download install JDK and Classpath setting Introduction to Java Object oriented programming Three OOP’s principles Advantages of Java Read More ...

Displaying output using 'println',println() method is the overloading method of PrintStream class of java.io package.Each overloading method has its own use

#println()

Displaying output using 'println'

Displaying output using ‘println’

Displaying output using ‘println‘ states that , when you want to display something on the output console from your program you need to make use of these ‘println‘ methods. Apart from println() method , Java has three more methods which are used likely less than the println() and they are print() and printf()

println() – Method

In order to display your output in a new line , we need to make use…

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