Call a Java function by String name like in Javascript

Question

Say I define such a function:

function helloWorld(e) {
  console.log("Hello " + e);
  return;
}

How Can i be able to call it like this:

String funcName="helloWorld"; 
funcName(e);

In Java is there a style as simple as in Javascript?

There are no functions in Java. The closest you'd get is static methods. Regardless, you should read about reflection - that's more or less what you're looking for. — Mureinik
– Mureinik, Commented Dec 9, 2017 at 21:24

Gonzalo Matheu · Accepted Answer · 2017-12-10 01:22:10Z

2

This is known as Reflection:

import java.lang.reflect.Method;

public class Demo {

  public static void main(String[] args) throws Exception{
      Class[] parameterTypes = new Class[1];
      parameterTypes[0] = String.class;
      Method method1 = Demo.class.getMethod("method1", parameterTypes);

      Demo demo = new Demo();

      Object[] parameters = new Object[1];
      parameters[0] = "message";
      method1.invoke(demo , parameters);
  }

  public void method1(String message) {
      System.out.println(message);
  }

}

Taken from https://stackoverflow.com/a/4685609/5281806

edited Dec 10, 2017 at 1:22

Gonzalo Matheu

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answered Dec 9, 2017 at 21:31

redMist

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1 Comment

Dudus Over a year ago

Closest. I'll have to abandon that train of thought though.

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