import java.util.*;
import java.lang.reflect.*;

/**
 * Get basic information about a class by reflection.
  */
public class Jook {
  public static void main(String[] args) {
    if (args.length == 0) {
      System.out.println("Usage: java Jook classname");
      System.exit(0);
    }

    try {
      Class<?> clazz = Class.forName(args[0]);
      Class<?> superClazz = clazz.getSuperclass();
      String modifiers = Modifier.toString(clazz.getModifiers());

      if (superClazz != null && superClazz != Object.class) {
        System.out.println(String.format("%s class %s extends %s {", modifiers, clazz.getName(),
                                         superClazz.getName()));
      } else {
        System.out.println(String.format("%s class %s {", modifiers, clazz.getName(),
                                         superClazz.getName()));
      }

      System.out.println("  Constructor:");
      printConstructors(clazz);

      System.out.println("  Method:");
      printMethods(clazz);

      System.out.println("  Field:");
      printFields(clazz);

      System.out.println("}");
    } catch (ClassNotFoundException e) {
      System.out.println("Not found class!");
    }
  }

  public static void printConstructors(Class<?> clazz) {
    Constructor[] constructors = clazz.getDeclaredConstructors();

    for (Constructor constructor : constructors) {
      String modifiers = Modifier.toString(constructor.getModifiers());

      Class<?>[] paramTypes = constructor.getParameterTypes();
      String[] paramTypesName = new String[paramTypes.length];
      for (int i = 0; i < paramTypes.length; ++i) {
        paramTypesName[i] = paramTypes[i].getName();
      }

      System.out.println(String.format("\t%s %s(%s);", modifiers, constructor.getName(),
                                       String.join(", ", paramTypesName)));
    }
  }

  public static void printMethods(Class<?> clazz) {
    Method[] methods = clazz.getDeclaredMethods();

    for (Method method : methods) {
      String modifiers = Modifier.toString(method.getModifiers());
      Class<?> returnType = method.getReturnType();

      Class<?>[] paramTypes = method.getParameterTypes();
      String[] paramTypesName = new String[paramTypes.length];
      for (int i = 0; i < paramTypes.length; ++i) {
        paramTypesName[i] = paramTypes[i].getName();
      }

      System.out.println(String.format("\t%s %s %s(%s);", modifiers, returnType.getName(),
                                       method.getName(), String.join(", ", paramTypesName)));
    }
  }

  public static void printFields(Class<?> clazz) {
    Field[] fields = clazz.getDeclaredFields();

    for (Field field : fields) {
      String modifiers = Modifier.toString(field.getModifiers());
      System.out.println(String.format("\t%s %s %s", modifiers, field.getType().getName(),
                                       field.getName()));
    }
  }
}