Calling a method in a class in each other method

I have a method that I want to be called each time one of 开发者_开发百科the other methods is called. I dont want to have to explicitely call it each time. Is there a way to have the other methods naturally call that method before executing its own code?

If I have a method thats called isThere() and I want it called in each other method, I dont want to have isThere() written in each method. I was hoping there would an easier way to do this.

You should look into AOP - Aspect Oriented Programming.

Since you are using Java, I recommend you to take a look at AspectJ.

You could access all other methods through another method, which first calls there, and then uses a parameter you passed to it to identify which method you want it to use, using a switch statement or something similar.

You may take a look into Observer pattern, which may also solve your problem a bit differently. Read the Wikipedia page linked here. Alternatively, you can read the Observer pattern from the Head First Design Pattern book.