How can I output a message containing Variables in GUI?

I want to display a message "What is the sum of x and y " in a GUI, where x and y are variable(integer type). I would like to know how can I write the coding before i put the message into a JPanel.
I hope Someone can help me ! Thank You Very Much!

String question = "What is the sum of " + x + " and " + y;
JLabel label = new JLabel( question );

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How can I output a message containing Variables in GUI?

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