Java Reflection - Java Method.invoke(Object obj, Object ... args)

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Syntax

Method.invoke(Object obj, Object ... args) has the following syntax.

public Object invoke(Object obj,  Object ... args)  
            throws IllegalAccessException ,   
                   IllegalArgumentException ,   
                   InvocationTargetException

Example

In the following code shows how to use Method.invoke(Object obj, Object ... args) method.

import java.lang.reflect.Method;
// ww w. j  ava 2 s  .  c om
class X {
  public void objectMethod(String arg) {
    System.out.println("Instance method: " + arg);
  }

  public static void classMethod() {
    System.out.println("Class method");
  }
}

public class Main {
  public static void main(String[] args) {
    try {
      Class<?> clazz = Class.forName("X");
      X x = (X) clazz.newInstance();
      Class[] argTypes = { String.class };
      Method method = clazz.getMethod("objectMethod", argTypes);
      Object[] data = { "Hello" };
      method.invoke(x, data); // Output: Instance method: Hello
      method = clazz.getMethod("classMethod", (Class<?>[]) null);
      method.invoke(null, (Object[]) null); // Output: Class method
    } catch (Exception e) {
      System.err.println(e);
    }
  }
}

The code above generates the following result.

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