Question: A JavaFX class has a button named 'btnAdd' that must add two int variables together 'a' and 'b' and store the result back into a

A JavaFX class has a button named 'btnAdd' that must add two int variables together 'a' and 'b' and store the result back into a when it is clicked. Assume that a and b are already declared and initialized. Write the complete lambda expression statement to do this.

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