<span style="font-family:Times New Roman;">package thinkinginjava;

import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class UseCaseTracker {
	public static void trackUseCases(List<Integer> useCases, Class<?> cl) {
		for (Method m : cl.getDeclaredMethods()) {
			System.out.println(m.toString());
			UseCase uc = m.getAnnotation(UseCase.class);
			if (uc != null) {
				System.out.println("Found Use Case : " + uc.id() + " " + uc.description());
				if(uc.id() == 48){
					try {
						Object pwdu = cl.newInstance();
						System.out.println(cl.isInstance(pwdu));
						System.out.println(m.invoke(pwdu, "jichenxiao"));
					} catch (IllegalAccessException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IllegalArgumentException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (InvocationTargetException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (InstantiationException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
				useCases.remove(new Integer(uc.id()));
			}
		}
		for(int i : useCases){
			System.out.println("Warning: Missing Use Case - " + i);
		}
	}

	public static void main(String[] args){
		List<Integer> useCases = new ArrayList<Integer>();
		Collections.addAll(useCases, 47,48,49);
		trackUseCases(useCases, PasswordUtils.class);
	}
}</span><span style="font-family:Microsoft YaHei;">
</span>