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Java Data Types and Variables
Java has two types of data types - primitive and non-primitive. Primitive types include integer, character, boolean, and floating point types like float and double which are used to represent numbers with decimals. Non-primitive types include classes, interfaces, and arrays. A variable in Java is a memory location that can store a value, and there are different types of variables including instance variables, class variables, local variables, and parameters. Variables are declared with a data type and name, and can be initialized with a value.
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Overview of data types and variables in Java, discussing their significance and classifications.
Definition of data types, explaining their role in specifying values and classifications into primitive and non-primitive.
List of primitive data types in Java including Integer, Character, Boolean, and Floating Point types.
Explains the integer data type in Java, including sizes and types: Byte, Short, Int, and Long.
Describes floating point data types used for numbers with fractions: float and double.
Defines the character data type in Java, which stores single character constants.
Covers boolean data types used to store true or false values.
Definition of variables in Java, highlighting their roles and different types: Instance, Class, Local, and Parameters.
Explains the syntax for variable declaration and initialization examples in Java programming.
Java Data Types and Variables
- 1. Java Tutorial Data Typesand Variables
- 2. Content • What isData Type in Java • What is Variable
- 3. What is DataType in Java • Data type specifies the size and type of values that can be stored in an identifier. • Data types in Java are classified into two types: • Primitive • Non-primitive
- 4. Primitive Data Types •Integer • Character • Boolean • Floating Point
- 5.
- 6. Integer • Integer typescan hold whole numbers such as 123 and −96. The size of the values that can be stored depends on the integer type that we choose. • Byte • Short • Int • long
- 7. Floating Point • Floatingpoint data types are used to represent numbers with a fractional part • float • double
- 8. Character • It storescharacter constants in the memory. • char
- 9. Boolean • Boolean datatypes are used to store values with two states: • true • false.
- 10. What is Variable •A Java variable is a piece of memory that can contain a data value • There are different types of variables in Java. They are as follows: • Instance Variables (Non-Static Fields) • Class Variables (Static Fields) • Local Variables • Parameters
- 11. Variable Declaration • Syntaxfor variable declaration datatype1 variable1, datatype2 variable2, … datatypen variablen; • For Example • int a; char ch; •Initialization • a = 10; • ch = ‘A’;