JAVA

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JAVA Theory

Introduction

James Gosling - 1955
JAVA was created by Sun Microsystems Inc in 1991, later obtained by Oracle Corporation. It was created by James Gosling and Patrick Naughton. Java is a general-purpose programming language that is class-based, object-oriented, and designed to have as few implementation dependencies as possible. The language structure of Java is like C and C++, yet it has less low-level offices than both of them. Starting at 2019, Java was one of the most well known programming.

History of JAVA language

Java was started as a project called "Oak" by James Gosling in June 1991. Gosling's goals were to implement a virtual machine and a language that had a familiar C-like notation but with greater uniformity and simplicity than C/C++. The first public implementation was Java 1.0 in 1995. Java is a first programming language which provide the concept of writing programs that can be executed using the web Originally designed for small embedded systems in electronic appliances like set-top boxes Firstly, it was called “Greentalk” by James Gosling and file extension Was gt. After that, it was called Oak and was developed as a part of the Green project.

Structure of JAVA Program


Headerimport java.util.Scanner
public classAddSub{
public staticvoid main
//main method declarationdeclaration
returnreturn 0;

Example program :


public class Example
{ //Main method declaration
public static void main(String[] args)
 { System.out.println("hello world");
} }

Applications

  1. It is used to develop Web application.
  2. It is used to Support the develop all mobile operating system.
  3. Java has strong memory management features, it automatically deletes the unused memory.

Keywords

There are only 50 keywords available in 'JAVA'

Abstract Assert Boolean BreakByteCase
CatchCharClassConstContinueDefault
Do DoubleElse EnumExtendsFinal
FinallyFloatForGoto IfImplements
ImportInstanceof LongNativeNewNull
PackagePrivateProtected Public ReturnShort
StaticStrictfp SuperSwitchSynchronizedThis
ThrowThrowsTransientTryVoid Volatile
WhileReturn

Arithmetic Operators

The following table shows all the arithmetic operators supported by the JAVA. Assume variable A holds 5 and variable B holds 10 then

OperatorDescriptionExample
+Adds two operatorsA + B = 15
-Subtracts second operand from the firstA - B = 5
*Multiplies both operatorsA * B = 0
/Divides numerator by de-nominatorB/A = 0.5
%Modulus operators and remainder of after an integer division B % A = 0
++Increment operator increases the integer value by one.A++ = 11
--Decrement operator decreases the integer value by one.A-- = 9

Logical Operators

Following table shows all the Logical operators supported by the JAVA. Assume variable A holds 1 and variable B holds 0 then

OperatorDescriptionExample
&&Called Logical AND operator.
If the both operands are non-zero.
Then the condition becomes true.
Subtracts second operand from the first.
Multiplies both operands. Divides numerator by denominator. 		(A && B) is false.
||Called Logical OR operator. If any of two operands is non-zero.
Then the condition becomes true.		(A||B) is true.
!Called Logical NOT operator.
It is used to reverse the logical state of its operand.
If a condition is true. Then logical not operator Will make it false		!(A && B) is true.

Relational Operators

The following table shows all the Relational operators supported by the JAVA. Assume variable A holds 10 and variable B holds 20 then

OperatorDescriptionExample
&&Called Logical AND operator.
If the both operands are non-zero.
Then the condition becomes true. Subtracts second operand from the first.
Multiplies both operands. Divides numerator by denominator.		(A && B) is false.
||Called Logical OR operator.
If any of two operands is non-zero. Then the condition becomes true.		(A || B) is true.
!Called Logical NOT operator.
It is used to reverse the logical state of its operand.
If a condition is true.
Then logical NOT operator Will make it false		!(A && B) is true