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First read the API doc for the text field class and find the method to get the text out of it.
Then read the API doc for the String class and find a method that will find an occurrence of the...

The text field has a method to get the data out of the textfield into a String.
The String class has methods to test the contents of the String.

Are you asking how to compare the contents of a String variable to a String literal?
aStrVar.equals("A literal")