The design principles of the core framework in the Java class library
The design principles of the core framework in the Java class library
In the Java programming language, the class library is a set of pre -written classes and interfaces, providing programmers with common functions.The Java class library uses some core framework design principles to ensure efficiency, reliability and easy use.
1. Interface isolation principle (ISP): divide a large interface into multiple small interfaces to avoid unnecessary dependencies.This can reduce coupling, improve flexibility and maintainability.
Example code:
public interface Shape {
double calculateArea();
}
public interface SolidShape {
double calculateVolume();
}
public class Cube implements Shape, SolidShape {
// Implement the corresponding interface method
}
2. Single responsibilities principles (SRP): Each class should have only one cause of change.This can reduce the complexity of the class, improve readability and maintenance.
Example code:
public class FileHandler {
public void readFile(String fileName) {
// Read the logic of the file
}
public void writeFile(String fileName, String content) {
// Write the logic of the file
}
}
3. Relying on inversion principle (DIP): High -level modules should not depend on low -level modules, and both should depend on abstract.Abstract should not be dependent on details, and details should be dependent on abstraction.
Example code:
public interface ILogger {
void log(String message);
}
public class FileLogger implements ILogger {
@Override
public void log(String message) {
// The logic of the file record log
}
}
4. Open and Closing Principles (OCP): Software entities should be expanded and open, and the modification is closed.When you need to add new features, you should use existing code instead of modifying it.
Example code:
public interface Validator {
boolean isValid(String input);
}
public class EmailValidator implements Validator {
@Override
public boolean isValid(String input) {
// The logic of mailbox verification
}
}
In short, the core framework design principles in the Java class library help write high -quality, easy -to -maintain code, and improve the reliability and scalability of the program.Programmers can design better software systems by following these principles.
