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Introduction to Java
Java – Overview
History of Java
Why Java
Java Features
Java Virtual Machine
First Java Application
Java Operators
Arithmetic Operator
Unary Operator
Logical Operator
Bitwise Operators
Compound Assignment Operators
Conditional Operator
InstanceOf Operator
Member Selection or Dot Operator
Relational Operator
Java Basics
Data Types
Control Statements
Decision Making Statements
If Statement
If-else Statement
Nested if-else Statement
If-else-If Ladder
Switch Statement
Loop Statements
Java Oops Concept
Oops
Abstraction
Encapsulation
Polymorphism
Inheritance
Exception Handling
Exception Handling
String Concept
Collection Framework
Collection Basics
List
Set
Map
Contains Method
Comparable Interface
Comparator Interface
Data Types-
Data types specify the different sizes and values that can be stored in the variable.
There are two types of data types in Java:
Primitive data types: The primitive data types include byte, short, int, long, float, double, char and Boolean.
Non-primitive data types: The non-primitive data types include String, Classes, Interfaces and Arrays.
There are 8 Primitive Data types in Java:
| Data Types | Size | Description |
| byte | 1 byte | Stores whole numbers from -128 to 127 |
| short | 2 bytes | Stores whole numbers from -32,768 to 32,767 |
| int | 4 bytes | Stores whole numbers from -2,147,483,648 to 2,147,483,647 |
| long | 8 bytes | Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 |
| float | 4 bytes | Stores fractional numbers. Sufficient for storing 6 to 7 decimal digits |
| double | 8 bytes | Stores fractional numbers. Sufficient for storing 15 decimal digits |
| boolean | 1 bit | Stores true or false values |
| char | 2 bytes | Stores a single character/letter or ASCII values |