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public class OSValidator { private static String OS = System.getProperty("os.name").toLowerCase(); public static void main(String[] args) { System.out.println(OS); if (isWindows()) { System.out.println("This is Windows"); } else if (isMac()) { System.out.println("This is Mac"); } else if (isUnix()) { System.out.println("This is Unix or Linux"); } else if (isSolaris()) { System.out.println("This ..