PRITIVETYPES module detailed explanation of the Guava principle analysis

Detailed explanation of the PrimitiveTypes module of the Guava principle analysis Introduction: Guava is a Java development library that provides many practical tools and auxiliary categories for simplifying Java programming.Among them, the PRIMITIVETYPES module is a core module in Guava, which is mainly used to process the operation and conversion of basic data types.This article will explore the principles and detailed usage methods of the Guava PrimitiveTypes module, and provide some Java code examples. 1. Introduction The Guava's PrimitiveTypes module provides a set of tool classes to process the conversion between the packaging class and original types corresponding to the basic data types (such as int, long, double, etc.).This module provides a more flexible way for the operation of the basic data type, and also makes the handling of these types of code more concise and easy to read. 2. Basic functions and commonly used classes: Here are some commonly used categories and functions of the Guava PrimitiveTypes module: 2.1. Primitives class: The Primitives class provides a static method that converts the basic type and the packaging class.For example, the toint method of the Primitives class can be converted to the INT type, or using the Compare method to compare the two basic types of values. Example code: Integer wrappedInt = Integer.valueOf(10); int primitiveInt = Primitives.toInt(wrappedInt); int compareResult = Primitives.compare(5, 10); 2.2. UNSIGNEDINTS and UNSIGNEDLONGS classes: UNSIGNEDINTS and UNSIGNEDLONGS class provides methods for processing non -symbols and non -symbols of long integer.These classes can be used for the conversion between non -symbolic integer and symbolic integer, and the value is greater than the value greater than integer.max_value or long.max_value. Example code: int unsignedInt = UnsignedInts.parseUnsignedInt("12345"); String unsignedIntString = UnsignedInts.toString(unsignedInt); 2.3. Doublemath and Intmath: Doublemath and Intmath class provides methods for processing floating point numbers and integer calculations.These methods can securely handle overflow and error and ensure the accuracy of the results. Example code: int factorialResult = IntMath.factorial(5); double roundResult = DoubleMath.roundToLong(3.14159, RoundingMode.DOWN); 3. Use case: Here are some common application cases of the PrimitiveTypes module: 3.1. Convert the basic type to packaging type: Guava's PrimitiveTypes module makes it more convenient to convert basic types into packaging types.It is no longer necessary to manually create the corresponding packaging object, but you can directly use the corresponding tool method to convert. Example code: int primitiveInt = 100; Integer wrappedInt = Primitives.wrap(int.class).cast(primitiveInt); 3.2. Determine whether an object is a basic type of packaging: Guava's PrimitiveTypes module also provides a convenient method to determine whether an object is a basic type of packaging class. Example code: boolean isWrapper = Primitives.isWrapperType(Integer.class); 4. Summary: Guava's PrimitiveTypes module provides a powerful and flexible tool for the conversion between the basic data type and the packaging class.By providing corresponding classes and methods, the code for processing basic data types is more concise and easy to read.It is hoped that through the analysis of this article, readers will have a deeper understanding of the Guava PrimitiveTypes module and can be flexibly applied in actual projects.