Java Tutorials - Herong's Tutorial Examples

∟Primitive Data Types and Literals

∟Literal Formats for Floating-Point

This section describes 2 literal formats for floating-point values: decimal and hex floating-point literals. The default floating-point literal data type is 'double'.

Java supports literals for 2 floating-point data types in 2 formats described below:

1. Decimal Floating-Point Literal - Basic rules on decimal floating-point literals:

• A floating-point value in "double" data type can be represented 2 parts: a base part and an optional exponent part.
• The base part consists of an integer part, a decimal point and a fractional part. Examples are: 365.242196, 3.14159 and 0.000000001.
• The exponent part is a sequence of decimal digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 with a leading sign + or - and a prefix of e or E. Examples are: 3.65242196e2, 3.14159e0 and 1.0e-9.
• To specify values in "float" data type, suffix F or f can be added. Examples are: 3.65242196e2F, 3.14159e0F and 1.0e-9F.
• To increase readability, _ can be used as group separators. Examples are: 3.652_421_96e2F and 3.141_59e0F.

2. Hex Floating-Point Literal - Basic rules on hex floating-point literals:

• A floating-point value in "double" data type can be represented 2 parts: a base part and an exponent part.
• The base part consists of an integer part, a decimal point, a fractional part and a prefix of 0x or 0X. The base part should be evaluated as a hexadecimal number: each digit in the integer part is evaluated 16 times more than the next digit on the decimal point side. each digit in the fractional part is evaluated 16 times less than the next digit on the decimal point side. For example: 0x123.456 should be evaluated as 1*16*16 + 2*16 + 3 + 4/16 + 5/16/16 + 6/16/16.
• The exponent part is a sequence of decimal digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 with a leading sign + or - and a prefix of p or P. The exponent part is evaluated with a base of 2, not 10. For example: 0x1p4 should be evaluated as 1*2*2*2*2.
• To specify values in "float" data type, suffix F or f can be added. Examples are: 0x123.456p0F and 0x1.23456p8F.
• To increase readability, _ can be used as group separators. Examples are: 0x12_345.6p-8F and 0x1.23_456p8F.

Table of Contents

 About This Book

 JDK - Java Development Kit

 Execution Process, Entry Point, Input and Output

►Primitive Data Types and Literals

 Data Types Supported in Java

 Integer Data Types

 Floating-Point Data Types

 Logical (Boolean) Data Type

 Literals of Primitive Types

 Literal Formats for Integers

 Literal Formats for Integers - Example

►Literal Formats for Floating-Point

 Literal Formats for Floating-Point - Example

 Literal Formats for Characters

 Literal Formats for Character - Example

 Control Flow Statements

 Bits, Bytes, Bitwise and Shift Operations

 Managing Bit Strings in Byte Arrays

 Reference Data Types and Variables

 Enum Types and Enum Constants

 StringBuffer - The String Buffer Class

 System Properties and Runtime Object Methods

 Generic Classes and Parameterized Types

 Generic Methods and Type Inference

 Lambda Expressions and Method References

 Java Modules - Java Package Aggregation

 Execution Threads and Multi-Threading Java Programs

 ThreadGroup Class and "system" ThreadGroup Tree

 Synchronization Technique and Synchronized Code Blocks

 Deadlock Condition Example Programs

 Garbage Collection and the gc() Method

 Assert Statements and -ea" Option

 Annotation Statements and Declarations

 Java Related Terminologies

 Archived Tutorials

 References

 Full Version in PDF/EPUB

Literal Formats for Floating-Point - Updated in 2024, by Herong Yang