Computer FAQs & Tips

This is the question that might rise by the Java programming beginner. Well, the answer to this question is: Primitive Data Types are the type that is preliminary defined by the Language which normally known as Keywords or reserved words.

In Java Language there are 8 primitive data types supported.

• byte: is an 8-bit signed two’s complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive).
  Default value: 0
• short: is a 16-bit signed two’s complement integer. It has a minimum value of -32,768 and a maximum value of 32,767 (inclusive).
  Default value: 0
• int: is a 32-bit signed two’s complement integer. It has a minimum value of -2,147,483,648 and a maximum value of 2,147,483,647 (inclusive).
  Default value: 0
• long: is a 64-bit signed two’s complement integer. It has a minimum value of -9,223,372,036,854,775,808 and a maximum value of 9,223,372,036,854,775,807 (inclusive).
  Default value: 0L
• float: is a single-precision 32-bit IEEE 754 floating point. The value range can be found here.
  Default value: 0.0f
• double: The double data type is a double-precision 64-bit IEEE 754 floating point. The value range can be found here.
  Default value: 0.0d
• boolean: has only two possible values: true and false.
  Default value: false
• char: is a single 16-bit Unicode character. It has a minimum value of ‘\u0000′ (or 0) and a maximum value of ‘\uffff’ (or 65,535 inclusive).
  Default value: ‘\u0000′

Number and String are not primitive data type. They are java Object defined under java.lang. They come with subclass or methods for manipulating the value of the object itself.

Reference:

• Sun Language Basics at http://java.sun.com/docs/books/tutorial/java/nutsandbolts/index.html