The technical principles and applications of PrimitiveTypes in Guava
The technical principles and applications of PrimitiveTypes in Guava
Introduction:
Guava is a Java open source library provided by Google. It expands the Java standard library and provides us with some more convenient and efficient tools and classes.One of them is the PrimitiveTypes class, which provides some practical methods for processing the original data type in Java.This article will explain the technical principles of PrimitiveTypes and provide some examples of use in practical applications.
Technical principle:
There are some common original data types in Java, such as int, long, and Boolean.These original types have higher performance and less memory consumption than the corresponding packaging types (such as Integer, Long, Boolean) when processing a large amount of data.Guava's PrimitiveTypes class provides us with a more convenient way to handle these original types.
The PrimitiveTypes class provides many static methods to perform the conversion between the original data type and the packaging type, as well as other common operations of the original type.For example, we can use the `PrimitiveTypes.inttype () method to obtain the Typetoken object that represents int type, and then perform various operations through this object, such as obtaining type names and judgment types.
Example:
Below are examples of use in practical applications in some PrimntedIVETYPES classes.
1. Get the original type Typetoken object:
import com.google.common.reflect.PrimitiveType;
import com.google.common.reflect.TypeToken;
public class PrimitiveTypesExample {
public static void main(String[] args) {
TypeToken<Integer> integerTypeToken = TypeToken.of(Integer.class);
PrimitiveType intPrimitiveType = PrimitiveType.INT;
System.out.println (Integertypetoken.isprimitive ()); // Output: false
System.out.println (intprimitiveType.isprimitive ()); // Output: true: true
TypeToken<Integer> integerPrimitiveTypeToken = PrimitiveType.INT.wrap();
System.out.println (Integerprimitivetypetoken.isprimitive ());// 输出 ： FALSE
}
}
2. Determine whether the type is the original type:
import com.google.common.reflect.PrimitiveType;
import com.google.common.reflect.TypeToken;
public class PrimitiveTypesExample {
public static void main(String[] args) {
TypeToken<Integer> integerTypeToken = TypeToken.of(Integer.class);
TypeToken<int[]> intArrayTypeToken = new TypeToken<int[]>() {};
System.out.println (PrimitiveType.int.isknown ()) // Output: true
System.out.println (Integertypetoken.unwrap () == int.class); // Output: TRUE
System.out.println (IntarrayTypetoken.unwrap () == int []. Class); // Output: true
}
}
Summarize:
PrimitiveTypes is a very practical class in Guava, which provides many methods and tools for processing raw data types.By using the PrimitiveTypes, we can easily convert the original type and packaging type, and perform various operations related to the original type.This allows us to process a large amount of original data more efficiently, improve the performance of the application and reduce memory consumption.
