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    ivaneeo's blog

    自由的力量,自由的生活。

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    1.調用構造函數的例子
    /**
         * Invoke a constructor on a class using reflection.
         *
         * @param klass The class.
         * @param classes The classes in the parameter list.
         * @param objects The objects to be used as parameters.
         * @return The object constructed.
         */
        public static Object invokeConstructor(final Class klass, final Class[] classes, final Object[] objects) {
            try {
                Constructor constructor;
                try {
                    constructor = klass.getDeclaredConstructor(classes);
                }
                catch (NoSuchMethodException e) {
                    constructor = klass.getConstructor(classes);
                }
                constructor.setAccessible(true);
                return constructor.newInstance(objects);
            }
            catch (NoSuchMethodException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (InstantiationException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (IllegalAccessException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (InvocationTargetException e) {
                throw new RuntimeException(e.getTargetException().getMessage());
            }
        }

    2.調用域的例子
    /**
         * Get the value of an instance field on an object using reflection.
         *
         * @param instance The instance of the object.
         * @param fieldName The name of the field.
         * @return The object returned by getting the field.
         */
        public static Object invokeGetInstanceField(final Object instance, final String fieldName) {
            try {
                Field field;
                try {
                    field = instance.getClass().getField(fieldName);
                }
                catch (NoSuchFieldException e) {
                    field = instance.getClass().getDeclaredField(fieldName);
                }
                field.setAccessible(true);
                return field.get(instance);
            }
            catch (NoSuchFieldException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (IllegalAccessException e) {
                throw new RuntimeException(e.getMessage());
            }
        }

    3.調用類方法的例子
    /**
         * Invoke an instance method on an object using reflection.
         *
         * @param instance The instance of the object.
         * @param methodName The name of the method.
         * @param classes The classes in the parameter list.
         * @param objects The objects to be used as parameters.
         * @return The object returned by invoking the method.
         */
        public static Object invokeInstanceMethod(
                final Object instance, final String methodName, final Class[] classes, final Object[] objects) {

            try {
                Method method;
                try {
                    method = instance.getClass().getDeclaredMethod(methodName, classes);
                }
                catch (NoSuchMethodException e) {
                    method = instance.getClass().getMethod(methodName, classes);
                }
                method.setAccessible(true);
                return method.invoke(instance, objects);
            }
            catch (NoSuchMethodException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (IllegalAccessException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (InvocationTargetException e) {
                throw new RuntimeException(e.getTargetException().getMessage());
            }
        }

    4.調用靜態方法的例子
    /**
         * Invoke a static method on a class using reflection.
         *
         * @param klass The class.
         * @param methodName The name of the method.
         * @param classes The classes in the parameter list.
         * @param objects The objects to be used as parameters.
         * @return The object returned by invoking the method.
         */
        public static Object invokeStaticMethod(
                final Class klass, final String methodName, final Class[] classes, final Object[] objects) {

            try {
                Method method;
                try {
                    method = klass.getDeclaredMethod(methodName, classes);
                }
                catch (NoSuchMethodException e) {
                    method = klass.getMethod(methodName, classes);
                }
                method.setAccessible(true);
                return method.invoke(klass, objects);
            }
            catch (NoSuchMethodException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (IllegalAccessException e) {
                throw new RuntimeException(e.getMessage());
            }
            catch (InvocationTargetException e) {
                throw new RuntimeException(e.getTargetException().getMessage());
            }
        }
    posted on 2005-08-04 14:47 ivaneeo 閱讀(407) 評論(0)  編輯  收藏 所屬分類: java魔力
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