Class Reflections

src/main/java/Reflections.java:14–193

public class Reflections {

    public static Field getField(Class clazz,String fieldName) throws NoSuchFieldException {

        while (true){
            Field[] fields = clazz.getDeclaredFields();
            for(Field field:fields){
                if(field.getName().equals(fieldName)){
                    return field;
                }
            }
            if(clazz == Object.class){
                break;
            }
            clazz = clazz.getSuperclass();
        }
        throw new NoSuchFieldException(fieldName);
    }


    public static Object getFieldValue(Object obj,String filedName) throws NoSuchFieldException, IllegalAccessException {
        Field field = getField(obj.getClass(),filedName);
        field.setAccessible(true);
        return field.get(obj);
    }

    public static void setFieldValue(Object obj,String filedName,Object value) throws NoSuchFieldException, IllegalAccessException {
        Field field = getField(obj.getClass(),filedName);
        field.setAccessible(true);
        field.set(obj,value);
    }

    public static Method getMethod(Class clazz,String methodName,Class... paramTypes) throws NoSuchFieldException {

        while (true){
            Method[] methods = clazz.getDeclaredMethods();
            for(Method method:methods){
                if(method.getName().equals(methodName) && Arrays.equals(paramTypes, method.getParameterTypes())){
                    method.setAccessible(true);
                    return method;
                }
            }
            if(clazz == Object.class){
                break;
            }
            clazz = clazz.getSuperclass();
        }
        throw new NoSuchFieldException(methodName);
    }


    public static boolean hasField(Class clazz,String fieldName) {
        try {
            getField(clazz,fieldName);
            return true;
        }catch (Exception e){
            return false;
        }