Java is an object-oriented programming language that was developed by James Gosling at Sun Microsystems to allow programs to be executed on the web, it has features like being simple, object-oriented, distributed, architecture neutral, robust, interpreted and compiled, and secure. Java programs use variables and operators to store and manipulate data, which can be of primitive types like int and double or non-primitive types like classes, and keywords are reserved words in Java that cannot be used as names.

1. CONCEPTSOF
CORE JAVA
By
AKSHITA MANGRULKAR

2. What is Java ?

3. Java is Object Oriented Programming language as well as
Plateform.
Java was developed by a team led by James Gosling at Sun
Microsystems.
Java is a first programming language which provide the concept
of writing programs that can be executed using the web.

4. Features of Java
Java is
Simple.
Java is
Object
Oriented
Java is
Distributed
Java is
Architecture
Neutral
Java is
Robust
Java is
Interpreted
and
Compiled
Java is
Secure
Java is Porta
Java is
Multi-
Threaded

5. Java Variables
A variable is a container which holds the value while the Java program is executed.
Data Types in Java
Data types specify the different sizes and values that can be stored in the variable. There are
two types of data types in Java:
1.Primitive data types: The primitive data types include Boolean , char, byte, short, int, long,
float and double.
2.Non-primitive data types: The non-primitive data types include Classes, Interfaces ,
and Arrays.
Eg. Int age=20; Value
Variable_name
Data Type

6. Operators in Java
Operator in Java is a symbol which is used to perform operations. For example: +, -, *, / etc.
There are many types of operators in
Java which are given below:
Unary
Operator
Arithmetic
Operator
Shift
Operator
Relational
Operator
Bitwise
Operator
Logical
Operator
Ternary
Operator
Assignment
Operator

7. Java Keywords
Java keywords are also known as reserved words. Keywords are particular words which acts as
a key to a code. These are predefined words by Java so it cannot be used as a variable or
object name.
Some of
Java
keywords
or
reserved
words are
given
below:
abstract: Java abstract keyword is used to declare abstract class. Abstract class can provide the
implementation of interface. It can have abstract and non-abstract methods.
boolean: Java boolean keyword is used to declare a variable as a boolean type. It can hold True and
False values only.
break: Java break keyword is used to break loop or switch statement. It breaks the current flow of the
program at specified condition.
char: Java char keyword is used to declare a variable that can hold unsigned 16-bit Unicode characters
continue: Java continue keyword is used to continue the loop. It continues the current flow of the
program and skips the remaining code at the specified condition.
do: Java do keyword is used in control statement to declare a loop. It can iterate a part of the program
several times.
else: Java else keyword is used to indicate the alternative branches in an if statement.