Print all features of a class

ClassChecker.java

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

/**
 * Print all features of a class
 * Created by albert on 2016/3/31.
 */
public class ClassChecker {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter class name: ");
        String className = scanner.nextLine();

        try {
            Class cls = Class.forName(className);
            printClassName(cls);
            printConstructors(cls);
            System.out.println();
            printFields(cls);
            System.out.println();
            printMethods(cls);
            System.out.println("}");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        System.exit(0);
    }

    /**
     * Print class name
     * @param cls
     */
    public static void printClassName(Class cls) {
        String name = cls.getName();
        String modifiers = Modifier.toString(cls.getModifiers());
        if (modifiers.length() > 0) {
            System.out.print(modifiers + " ");
        }
        System.out.print("class " + name);

        Class superCls = cls.getSuperclass();
        if (superCls != null && superCls != Object.class) {
            System.out.print(" extends " + superCls.getName());
        }

        Class[] interfaces = cls.getInterfaces();
        for (int i = 0; i < interfaces.length; i++) {
            if (i == 0) {
                System.out.print(" implements ");
            } else {
                System.out.print(", ");
            }
            System.out.print(interfaces[i].getName());
        }

        System.out.println(" {");
    }

    /**
     * Print all constructors of a class
     * @param cls
     */
    public static void printConstructors(Class cls) {
        Constructor[] constructors = cls.getDeclaredConstructors();
        for (Constructor c : constructors) {
            System.out.print("    ");
            String name = c.getName();
            String modifiers = Modifier.toString(c.getModifiers());
            if (modifiers.length() > 0) {
                System.out.print(modifiers + " ");
            }
            System.out.print(name + "(");
            Class[] paramTypes = c.getParameterTypes();
            for (int i = 0; i < paramTypes.length; i++) {
                if (i > 0) {
                    System.out.print(", ");
                }
                System.out.print(paramTypes[i].getName());
            }
            System.out.println(");");
        }
    }

    /**
     * Print all fields of a class
     * @param cls
     */
    public static void printFields(Class cls) {
        Field[] fields = cls.getDeclaredFields();
        for (Field field : fields) {
            System.out.print("    ");
            Type type = field.getType();
            String name = field.getName();
            String modifiers = Modifier.toString(field.getModifiers());
            if (modifiers.length() > 0) {
                System.out.print(modifiers + " ");
            }
            System.out.print(type.getTypeName() + " " + name);

            if (Modifier.isPublic(field.getModifiers()) && Modifier.isStatic(field.getModifiers())) {
                try {
                    System.out.print(" = " + field.get(null));
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            System.out.println(";");
        }
    }

    /**
     * Print all methods of a class
     * @param cls
     */
    public static void printMethods(Class cls) {
        Method[] methods = cls.getMethods();
        for (Method method : methods) {
            System.out.print("    ");
            Type type = method.getReturnType();
            String name = method.getName();
            String modifiers = Modifier.toString(method.getModifiers());
            if (modifiers.length() > 0) {
                System.out.print(modifiers + " ");
            }
            System.out.print(type.getTypeName() + " " + name + "(");

            Class[] paramTypes = method.getParameterTypes();
            for (int i = 0; i < paramTypes.length; i++) {
                if (i > 0) {
                    System.out.print(", ");
                }
                System.out.print(paramTypes[i].getTypeName());
            }
            System.out.println(");");
        }
    }
}