Android 中利用反射技术实现加减乘除

核心提示：// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (Illegal

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (InstantiationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (NoSuchMethodException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (InvocationTargetException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

break;

}

}

};

/**

* 操作方法

*

* @param oper

* @param first

* @param second

* @return

* @throws ClassNotFoundException

* @throws IllegalAccessException

* @throws InstantiationException

* @throws SecurityException

* @throws NoSuchMethodException

* @throws IllegalArgumentException

* @throws InvocationTargetException

*/

String operation(String oper, int first, int second)

throws ClassNotFoundException, IllegalAccessException,

InstantiationException, SecurityException, NoSuchMethodException,

IllegalArgumentException, InvocationTargetException {

// 获取相应的类对象名称

Class classType = Class.forName("com.terry.operationClass");

// 如果知道类名并且类名存在于我们工程中，即jar 文件中包含可以使用如下写法

//Class classType = operationClass.class;

// 返回本类对象

Object invokeOperation = classType.newInstance();

if (oper.equals("+")) {

// 根据类对象名称去查找对应的方法

Method addMethod = classType.getMethod("add", new Class[] {