Answer:
There is an error in "String s=s1-s2 ";
Explanation:
In java programming, we can subtract subtract two strings variable with "-" operator.Java programming does not support an overload of the '-' operator.In java, we can use only "+" operator to append two strings variable.There is no such method to subtract strings in java.Therefore in the given code String s=s1-s2 will give an "bad operand type" error because we can not subtract one string variable from the second string variable.
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Answer:
The correct answer is C:
btOK.setOnAction((ActionEvent e) -> System.out.println("Handle the event"));
Explanation:
The button produces an action once clicked. The setOnAction method indicates what will happen when the button is clicked. Action Event is a type of event that gets processed by EventHandler, which provides the action to be performed by clicking the button (printing out "Handle the event").
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