CoCalc -- Test.java

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class Test {
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    public static void main(String[] args) {
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        JOptionPane.showMessageDialog(null, "Hello, world!");
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        System.exit(0);
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    }
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}
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CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!