当给定的类名是字符串时如何调用另一个类中的方法

Question

I have two classes in java. I am calling a method of 2nd class from 1st class when the 2nd class name is stored in a string variable. I tried the below code.It creates the class.

String adapterClass = "com.appzillon.server.impl.ViewAccDtlsAdapterImpl";
Class className = Class.forName(adapterClass);

After that how to call the method.Method name is getInfo with a string type paramater.

Answer 1

Method method = className.getDeclaredMethod("getInfo", String.class);
method.invoke(instance, "your parameter");

Where instance is either:

Object instance = null;

if the method is static. Or:

Object instance = className.getDeclaredConstructor().newInstance();

If the method is a member method

Answer 2

For scenarios like these, you can very well use Java Reflection APIs. Class classInstance = Class.forName(<your class name>); Methoed methodHandle = classInstance.getMethod(<methodName>,<arguments classes>); Object returnValue = methodHandle.invoke(null, "parameter-value1");

Note : The null parameter is the object you want to invoke the method on. If the method is static you supply null instead of an object instance