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Editorial Team
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Asked: 2026-06-13T11:47:24+00:00

I made a calculator in Java, but some of the code is very repetitive.

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I made a calculator in Java, but some of the code is very repetitive. Here is what I used to add an ActionListener

    one.addActionListener(handlerOne);
    two.addActionListener(handlerOne);
    three.addActionListener(handlerOne);
    four.addActionListener(handlerOne);
    five.addActionListener(handlerOne);
    six.addActionListener(handlerOne);
    seven.addActionListener(handlerOne);
    eight.addActionListener(handlerOne);
    nine.addActionListener(handlerOne);
    zero.addActionListener(handlerOne);

    add.addActionListener(handlerOne);
    subtract.addActionListener(handlerOne);
    multiply.addActionListener(handlerOne);
    divide.addActionListener(handlerOne);
    sqrt.addActionListener(handlerOne);
    exp.addActionListener(handlerOne);
    equals.addActionListener(handlerOne);
    cls.addActionListener(handlerOne);
    modulus.addActionListener(handlerOne);

Is there any way to shorten this up?

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1 Answer

  1. Editorial Team

    Use a JButton[] for all or some (only digit buttons maybe) of your buttons. Then iterate over that array and add ActionListener to the buttons:

    JButton[] buttons = new JButton[10]; // For digit buttons.

int i = 0;

for(JButton button: buttons)
   buttons[i++].addActionListener(handlerOne);

    Similarly you can use a JButton[] for the operator buttons. By using different arrays, you can avoid possible confusions, I think.

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