Pure4j Core Framework Introduction and Use Guide
Pure4j Core Framework Introduction and Use Guide
Pure4J Core is an open source Java framework, which aims to simplify the writing and maintenance process of code and provide a more efficient development experience.This framework is based on the concept of "Pure Code" (pure code), and encourages developers to use more concise and more readable code styles.
The Pure4J Core framework mainly includes the following core functions:
1. Immutability: Pure4j Core supports to build code in an unsatisfactory object to ensure that the data will not be modified once it is created.Unchanged objects have thread security and are easier to test and debug.
The following is an example. How to use Pure4j Core to create unspeakable objects:
import org.pure4j.annotations.immutable.ImmutableValue;
@ImmutableValue
public class Person {
private final String name;
private final int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
2. Pure Functions: Pure4j Core encourages developers to write pure functions, that is, functions without side effects.The characteristic of pure functions is that the same input can always get the same output without any unexpected behavior.
The following is an example. How to use Pure4j Core to create a pure function:
import org.pure4j.annotations.pure.Pure;
public class MathUtils {
@Pure
public static int add(int a, int b) {
return a + b;
}
}
3. Defensive Programming: Pure4j Core provides some annotations to help developers perform code verification during compilation to reduce potential errors.For example,@notnull annotation can ensure that the parameters are not empty,@Positive annotation can ensure that the parameters are positive.
The following is an example, demonstrating how to use Pure4j Core for defensive programming:
import org.pure4j.annotations.immutable.Mutable;
import org.pure4j.annotations.pure.Enforcement;
import org.pure4j.annotations.pure.Pure;
import org.pure4j.annotations.pure.ReadOnly;
import org.pure4j.exception.PureMethodOverwrittenException;
public abstract class Shape {
@Pure(Enforcement.ENABLED)
public abstract double area();
@Pure(Enforcement.ENABLED)
public abstract double perimeter();
@Pure(Enforcement.DISABLED)
public void printInfo() {
System.out.println("This is a shape.");
}
}
The above is the core function and usage of the Pure4j Core framework.By using the Pure4J Core framework, developers can easily write high -quality, easy -to -maintain Java code, and can benefit from verification during compilation.I hope this article can help you understand the Pure4J Core framework and apply it in actual projects.
