package review;/*12:43 2019/7/21*/
import model.AnotherClass;
import model.OneClassMore;
import model.SomeClass;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
 * 这个类列举了java语言中关于反射机制的常用的一些方法
 * @author zhangxingshuo
 */
public class AboutReflection {
  public static void main(String[] args) throws Exception {
  }
  /*获得Class对象的3种方式*/
  private static Class<?> getClazz0(String className) throws ClassNotFoundException {
    Class clazz=Class.forName(className);
    return clazz;
  }
  private static Class<?> getClazz1(Object object) {
    Class clazz=object.getClass();
    return clazz;
  }
  private static Class<?> getClazz2() {
    Class clazz=model.SomeClass.class;
    return clazz;
  }
  /*经常使用的Class对象的3个方法*/
  private static String useClazz0(Class clazz) {
    String fullyQualifiedName=clazz.getName();
    return fullyQualifiedName;
  }
  private static String useClazz1(Class clazz) {
    String className=clazz.getSimpleName();
    return className;
  }                          //ex:private      //ex:abstract
  private static Object useClazz2(Class clazz) throws IllegalAccessException, InstantiationException {
    Object object=clazz.newInstance();
    return object;
  }
  /*获得Constructor对象的3个方法*/
  private static Constructor<?>[] getConstructorObject0(Class clazz) {
    Constructor<?>[] constructors=clazz.getConstructors();
    return constructors;
  }
  private static Constructor<?>[] getConstructorObject1(Class clazz) {
    Constructor<?>[] constructors=clazz.getDeclaredConstructors();
    return constructors;
  }
  private static Constructor<?> getConstructorObject2(Class clazz) throws NoSuchMethodException {
    Constructor<?> constructor=clazz.getConstructor(SomeClass.class, AnotherClass.class, OneClassMore.class);
    return constructor;
  }
  private static Constructor<?> getConstructorObject3(Class clazz) throws NoSuchMethodException {
    Constructor<?> constructor=clazz.getDeclaredConstructor(SomeClass.class, AnotherClass.class, OneClassMore.class);
    return constructor;
  }
  /*经常使用的Constructor对象的2个方法*/
  private static Object useConstructorObject0(Constructor<?> constructor) throws IllegalAccessException, InvocationTargetException, InstantiationException {
                //under here,if the variable override==true,jvm willl not check the accessible modifier
    Object object=constructor.newInstance(new SomeClass(),new AnotherClass(),new OneClassMore());
    return object;
  }
  private static void useConstructorObject1(Constructor<?> constructor) {
                //under here changing "override" variable's value who is defined in AccessibleObject,the "super and super" Class of Constructor
    constructor.setAccessible(true);
  }
  /*还有一些*/
  private static Class<?> useConstructorObject2(Constructor<?> constructor) {
    Class clazz=constructor.getDeclaringClass();
    return clazz;
  }
  private static int useConstructorObject3(Constructor<?> constructor) {
    int modifiers=constructor.getModifiers();
    return modifiers;
  }
  private static String useConstructorObject4(Constructor<?> constructor) {
       //constructor name is same as the class name
    String constructorName = constructor.getName();
                      //under here getDeclaringClass().getName();
    return constructorName;
  }
  /*获取Field对象的4个方法*/
  private static Field[] getFieldObject0(Class clazz){
    Field[] fields = clazz.getFields();
    return fields;
  }
  private static Field[] getFieldObject1(Class clazz){
    Field[] declaredFields = clazz.getDeclaredFields();
    return declaredFields;
  }
  private static Field getFieldObject2(Class clazz) throws NoSuchFieldException {
    Field field = clazz.getField("theFieldName");
    return field;
  }
  private static Field getField3(Class clazz) throws NoSuchFieldException {
    Field field = clazz.getDeclaredField("theFieldName");
    return field;
  }
  /*经常使用的Field对象的3个方法*/
  private static Object useFieldObject0(Field field,Object object) throws IllegalAccessException {
    Object fieldValue = field.get(object);
    return fieldValue;
  }
  private static void useFieldObject1(Field field,Object object) throws IllegalAccessException {
            //an object as the field value
    field.set(object,new Object());
  }
  private static void useFieldObject2(Field field){
             //same process
    field.setAccessible(true);
  }
  /*还有一些*/
  private static int useFieldObject3(Field field){
    int modifiers = field.getModifiers();
    return modifiers;
  }
  private static String useFieldObject4(Field field){
    String fieldName = field.getName();
    return fieldName;
  }
  /*获取Method对象的4个方法*/
  private static Method[] getMethodObject0(Class clazz){
    Method[] methods=clazz.getMethods();
    return methods;
  }
  private static Method[] getMethodObject1(Class clazz){
    Method[] methods=clazz.getDeclaredMethods();
    return methods;
  }
  private static Method getMethodObject2(Class clazz) throws NoSuchMethodException {
    Method method=clazz.getMethod("someMethodName",SomeClass.class,AnotherClass.class,OneClassMore.class);
    return method;
  }
  private static Method getMethodObject3(Class clazz) throws NoSuchMethodException {
    Method method=clazz.getDeclaredMethod("someMethodName",SomeClass.class,AnotherClass.class,OneClassMore.class);
    return method;
  }
  /*经常使用的Field对象的2个方法*/
  private static Object useMethodObject0(Method method,Object object) throws InvocationTargetException, IllegalAccessException {
    Object returnedobject=method.invoke(object,new SomeClass(),new AnotherClass(),new OneClassMore());
    return returnedobject;
  }
  private static void useMethodObject1(Method method){
    method.setAccessible(true);
  }
  /*还有一些*/
  private static int useMethodObject2(Method method){
    int modifiers = method.getModifiers();
    return modifiers;
  }
  private static String useMethodObject3(Method method){
    String methodName = method.getName();
    return methodName;
  }
  /*
  tips
  通过getMethods(),得到该类或接口独有的和继承自它的所有父类与接口的public方法组成的数组.
  通过getDeclaredMethods(),得到该类或接口独有的所有方法,(包括public和非public).
  */
  /*just as a empty template for convenience*/
  private static void m(){
  }
}