Java Data Types and Variables

Java Data Types and Variables

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  Java Tutorial Data Typesand Variables
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  Content • What isData Type in Java • What is Variable
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  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
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  Primitive Data Types •Integer • Character • Boolean • Floating Point
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  Non-primitive • Classes • Interfaces •Arrays
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  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
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  Floating Point • Floatingpoint data types are used to represent numbers with a fractional part • float • double
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  Character • It storescharacter constants in the memory. • char
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  Boolean • Boolean datatypes are used to store values with two states: • true • false.
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  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
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  Variable Declaration • Syntaxfor variable declaration datatype1 variable1, datatype2 variable2, … datatypen variablen; • For Example • int a; char ch; •Initialization • a = 10; • ch = ‘A’;