Error when outputting "Hello World!" part 2?

Question

Java

Guys, hello!
I ask you to help with the output of the text "Helo World" from the class method on clicking the button. It doesn't give an error, just nothing happens.

index.jsp:

<form action="${pageContext.request.contextPath}/myservlet" method="post">
    <button type="submit" name="button" value="button1">Button 1</button>
    <button type="submit" name="button" value="button2">Button 2</button>
    <button type="submit" name="button" value="button3">Button 3</button>
</form>

Servlet:

@WebServlet("/myservlet")
public class MyServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        MyClass myClass = new MyClass();
        String button = request.getParameter("button");

        if ("button1".equals(button)) {
            myClass.method1();
        } else if ("button2".equals(button)) {
            myClass.method2();
        } else if ("button3".equals(button)) {
            myClass.method3();
        } else {
            // ???
        }

        request.getRequestDispatcher("index.jsp").forward(request, response);
    }
}

java class:

public class MyClass {

public void method1(){
System.out.println("Helo World1!");
}

public void method2(){
System.out.println("Helo World2!");
}

public void method3(){
System.out.println("Helo World3!");
}

}

Answer 1

According to java, I can say that, in addition to the implementation of the methods themselves, we need a starting point.
After declaring the class, you need to add the public static void main method, inside which to call all the other methods, which, in turn, must be made static, since an instance of the class is not created.