How to create a blank function in a file dynamically?

I am stuck with the following need
I have three options in the combobox, say a,b and c.
And an Apply button is there.
if i select a and then click Apply button,
a file 'a.java' is to be created , with a blank function onApply(), like these..
a.java
public class a
public void onApply()
//TODO
Also, on clicking that apply button, these file should be focused and the control should be into this function
Please help me ASAP....

You can't do that unless the user has a Java compiler installed and you are prepared to do all kinds of class-loading manipulation.
It's an extremely strange requirement - what problem is it attempting to solve?

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