ConstructObjects

public static <T> Object ConstructObjectWithDefaultValue( Object obj  ) {
        try {
            //get all fields of class
            Field[] fields = obj.getClass().getDeclaredFields();
            Field[] fieldsSuperClass = obj.getClass().getSuperclass().getDeclaredFields();
            //set fields of base class
            if( fields!=null && fields.length > 0 ) {
                for( Field f : fields ) {
                    setField(obj, f);
                }
            }
            //set fields of super class
            if( fieldsSuperClass!=null && fieldsSuperClass.length>0 ) {
                for(Field f : fieldsSuperClass ) {
                    setField(obj, f);
                }
            }
        }catch (Exception e) {
            System.out.println( e.toString() );
        }
        return obj;

    }

    public static void setField( Object obj,Field f ) throws Error, IllegalArgumentException, IllegalAccessException{
        //override private access modifier
        f.setAccessible( true );

        //---PRIMITIVE_TYPES-------------------
        if( f.getType() == boolean.class ) {
            f.set(obj, false);
        }else if( f.getType() == boolean[].class ) {
            boolean[] boolArray = new boolean[0];
            f.set(obj, boolArray);
        }else if( f.getType() == int.class ) {
            f.set(obj, 0);
        }else if( f.getType() == short.class ) {
            f.set(obj, 0);
        }else if( f.getType() == int.class ) {
            f.set(obj, 0);
        }else if( f.getType() == long.class ) {
            f.set(obj, 0);
        }else if( f.getType() == float.class ) {
            f.set(obj, 0.0f);
        }else if( f.getType() == double.class ) {
            f.set(obj, 0.0d);
        }else if( f.getType() == char.class ) {
            f.set(obj, '0');
        }
        //---//PRIMITIVE_TYPES-----------------

        //---COMPLEX_JAVA_LANG_TYPES-----------
        else if( f.getType() == String.class ) {
            f.set(obj, "");
        }else if( f.getType() == Integer.class ) {
            f.set(obj, 0);
        }
        //---//COMPLEX_JAVA_LANG_TYPES---------

        //---COMPLEX_JAVA_UTIL_TYPES-----------
        else if( f.getType() == Calendar.class ) {
            Calendar c = Calendar.getInstance();
            c.setTime(new Date());
            f.set(obj, c);
        }else if( f.getType() == Date.class ) {
            f.set(obj, new Date());
        }
        //---//COMPLEX_JAVA_UTIL_TYPES---------

        //---CUSTOM_TYPES----------------------
        //---//CUSTOM_TYPES--------------------
    }