Java语言程序设计-基础篇-第八版-第一章

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 WelcomeInMessageDialogBox {
public static void main(String[] args){
JOptionPane.showMessageDialog(null, "Welcome to Java!");
}
}