How to make variableExpresion to be executed only once

Hi Sir/Friend
i have required to generate jasper report here i want to assign value to a variable only once... and the same variable is using for further expression how it can be done plz help me i m not getting this plz....
with regards
kotresh

Thank you for replying!
So which tone is used by calendar alarm that I should change? I see ringing tone, video call tone, message alert tone, email alert, keyboard tone.
Actually I never let my cell phone ring, so I already set the ringing type as "silent".

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