you can put it into a function

1. boolean isItAnImage(String loadPath) {
2. return (
3.    loadPath.endsWith(".jpg") ||
4.    loadPath.endsWith(".jpeg") ||
5.    loadPath.endsWith(".png")  ) ;
   
6. }

When I want to load only the images from a directory I usually filter the list of filenames all at once. But I guess here you really want to freely select one input image. Your method is definitely an option. Alternatively, the loadImage() method also has this similar check, so it will return an error to the console if the image extension is not recognised or the file is not an image. Then the PImage will be null. So you can also use that route...

Code Example

1. String loadPath = selectInput();
2. PImage img = loadImage(loadPath);
3. if (img != null) {
4.   image(img, 0, 0); // you actually selected an image
   
5. } else {
6.   println("no image loaded"); // the file selected was not an image that could be loaded
   
7. }

Thanks chrisir and amnon. I think  there is no need to redo what is done :) the null check appears to be easier. I try that.