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How to build a window

import javax.swing .*; public class Window1 {public void creaForm1 () {Window1 = new JFrame JFrame ("window IVL"); finestra1.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); Window1. setSize (300.300); finestra1.setVisible (true);}}

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TestaFinestra1 public class {public static void main (String [] args) {Window1 f = new Window1 (); f.creaForm1 ();}}