摘要： public class Welcome { public static void main(String[] args){ System.out.println("Welcome come to Java!"); } }public class ComputeExpression { public static void main(String[] args){ System.out.println((10.5 + 2 * 3) / (45 - 3.5)); }}import javax.swing.JOptionPane;public class WelcomeIn.. 阅读全文