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public java v1 · immutableimport javax.swing.*;public class SwingTest { public static void main(String[] args) { JFrame jf = new JFrame("Free swings better!"); jf.setVisible(true); }}import javax.swing.*;public class SwingTest { public static void main(String[] args) { JFrame jf = new JFrame("Free swings better!"); jf.setVisible(true); }}