Java example of obtaining the parameter type of a reflection method based on the method name

/**
 * 根据方法名称取得反射方法的参数类型(没有考虑同名重载方法使用时注意)
 * @param obj         类实例  
 * @param methodName  方法名
 * @return
 * @throws ClassNotFoundException
 */
public static Class[]  getMethodParamTypes(Object classInstance, 
 String methodName) throws ClassNotFoundException{
 Class[] paramTypes = null;
   Method[]  methods = classInstance.getClass().getMethods();//全部方法
 for (int  i = 0;  i< methods.length; i++) {
     if(methodName.equals(methods[i].getName())){//和传入方法名匹配 
         Class[] params = methods[i].getParameterTypes();
            paramTypes = new Class[ params.length] ;
            for (int j = 0; j < params.length; j++) {
                paramTypes[j] = Class.forName(params[j].getName());
            }
            break; 
        }
    }
 return paramTypes;
}
 //取得方法测试(Test类大家还是任意写吧，这里不列举了)
 Method m =  Test.class.newInstance().getClass().getDeclaredMethod("方法名称", getMethodParamTypes(Test.class.newInstance(),"方法名称"));

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