Instantiate class from string

jeremydouglass · August 31, 2021, 3:02pm

Re: reflection on this forum:

@GoToLoop has spent quite a bit of time on reflection in Processing.

The Processing API uses a related technique, a string as a method name (rather than a class name) in, for example, selectFolder – internally it calls selectMethod, which uses .getMethod() to turn the text String callbackMethod argument given to selectFolder into the corresponding Processing function (Method selectMethod) for the callback.

github.com

processing/processing/blob/36b3990ce3df4b5a8bc40e6e428532bc5aeca3d8/core/src/processing/core/PApplet.java#L6711-L6720

    
      
          
          
static private void selectCallback(File selectedFile,
                                             String callbackMethod,
                                             Object callbackObject) {
            try {
              Class<?> callbackClass = callbackObject.getClass();
              Method selectMethod =
                callbackClass.getMethod(callbackMethod, new Class[] { File.class });
              selectMethod.invoke(callbackObject, new Object[] { selectedFile });

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Instantiate class from string

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