My first Java compile error!

I'm not new to programming but I am to Java, I like it so far and I know I have a long way to go.
I just started an online training course in Java and the second
program to write was this:
import java.awt.Frame;
import java.awt.Label;
public class HowdyWindow extends Frame {
public static void main(String args[]) {
new HowdyWindow();
HowdyWindow() {
Label label;
label = new Label("Howdy!");
add(label);
pack();
show();
I then compiled it and was met with this ugly statement:
Note: HowdyWindow.java uses or overrides a depricated API.
Note: Recompile with Xlint:deprecation for details
Did that, got this:
HowdyWindow.java:13 Warning:[serial] Serializable class HowdyWindow has no definition of serialVersionUID
public class HowdyWindow extends Frame {
2 warnings
As a newbie I have no clue, How could I ?
Please someone tell me what to do next, in Newbie terminology?

are they both warnings? errors you have to fix; warnings should be corrected eventually, but you can get by for now.
this is happening because the show() method is deprecated. you should use setVisible(true) instead. look at the javadocs and see what's what.
did you get a HowdyWindow.class file? if so, execute it and see what happens.
%

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