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Modern Java: From Fundamentals to Advanced Architecture

Solution: The Method Counter

Explore how to use Java Reflection to count and categorize methods of a class. Learn to differentiate between inherited Object methods and business-specific methods, illustrated with PaymentProcessor class examples. This lesson helps you understand dynamic code inspection and method classification at runtime.

We'll cover the following...
Java 25
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
public class MethodCounter {
    public static void analyzeClass(Class<?> clazz) {
        List<String> businessMethods = new ArrayList<>();
        List<String> objectMethods = new ArrayList<>();
        
        Method[] methods = clazz.getMethods();
        for (Method method : methods) {
            if (method.getDeclaringClass() == Object.class) {
                objectMethods.add(method.getName());
            } else {
                businessMethods.add(method.getName());
            }
        }
        
        System.out.println("Analysis of " + clazz.getSimpleName() + ":");
        System.out.println("Business Methods (" + businessMethods.size() + "): " + businessMethods);
        System.out.println("Standard Methods (" + objectMethods.size() + "): " + objectMethods);
    }
    public static void main(String[] args) {
        analyzeClass(PaymentProcessor.class);
    }
}
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