Data Types in Object Oriented System Design : Practice MCQ Questions & Answers with Explanations

'double' is the longest data type with 64-bit defined by Java to store floating-point values.

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'byte' is signed 8-bit smallest integer data type that has range from -128 to 127.

String is a collection of characters and is stored in a variable of string data type.

An 'enum' data type is special data type that enables a variable to store set of predefined constants.

Only 'float' and 'double' belong to floating-point numbers. 'byte' comes under 'Integer' data type.

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Java defines eight simple types of data which are put in four groups. They are integers, floating-point numbers, boolean, characters.

Primitive Datatypes are defined by Java. Reference Datatypes are user defined, created using defined constructors of class.