Invoke Method in Java

In Java, java.lang.reflect.*; package is required to import in the program to invoke the methods.

In Java, java.lang.reflect.*; package is required to import in the program to invoke the methods. As you can see here we are using reflect method, this could be either a class method or instance method and the usage of methods in Java is to access a single method either on class or interface. This example will show you, how to declare and invoke the methods in Java.

Code for Java Method - Invoke


import java.lang.reflect.*;



public class InvokeMethod {

public int add(int a, int b)

{

return a + b;

}

public static void main(String args[]){

try {

Class cla = Class.forName("InvokeMethod");

Class partypes[] = new Class[2]; 

partypes[0] = Integer.TYPE;

partypes[1] = Integer.TYPE;

Method method = cla.getMethod(

"add", partypes);

InvokeMethod invoke = new InvokeMethod();

Object arg[] = new Object[3];

arg[0] = new Integer(30);

arg[1] = new Integer(40);

arg[2] = new Integer(50);

Object object = method.invoke(invoke, arg);

Integer integer = (Integer)object;

System.out.println(integer.intValue());

}

catch (Throwable e) {

System.out.println(e);

}

}

}

Output will be displayed as:

Invoke Method Java

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Invoke Method in Java

Invoke Method in Java

Invoke Method in Java

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