How to implement "Store Value" Keyword.

give a few more details of what are you trying to do.

like screen shot, how are you extracting the data?

As per the screenshot attached,
when we click on the generate button then after few time dynamic Id will generate in the text box which is highlighted in the yellow color. i need to use this system generated id many time throughout the application. so i needs to store it, How could i do the same??

I want to implement keyword for it so that i can use that keyword anywhere which will store the dynamically generated values.

driver.findelement(By.xpath(" path\to\generatebutton ")).click();
thread.sleep(5000);
String ID = driver.findelement(By.xpath(" path\to\textbox ")).getText();
system.out.print(ID);