运行旧的Java程序

Question

a few years back in college I wrote TONS of simple little java programs... I haven't used them in a while and I would like to go back and revist them. I believe I used Netbeans as my IDE (but i also could have used Eclipse... cant remember)..

anyways long story short.... I cant remember how to compile them and I cant open these as projects in any of my IDEs....

I've tried using javac and then java to run a few in the command line, however one specifically will not run and gives me this error:

Exception in thread "main" java.lang.NoSuchMethodError: main

I know this is because I don't have a public static void main method in this program. I can't remember why I don't.... but here's in theory how it should work.... I have 3 program files:

• race.java
• bicyclePanel.java
• controlPanel.java

race extends JApplet and has a method public void init() .... which creates an instance of controlPanel class.... controlPanel class creates an instance of bicyclePanel and so on and so forth....

my question is.. am I supposed to have a main method? How can I rebuild this into an IDE and run? It's been so many years I cant remember all the in's & outs of java :(

Answer 1

Fire up NetBeans or Eclipse and Import the Projects with existing sources. It will do most of the stuff. You may have to adjust the broken references.

Answer 2

Yes, you are supposed to have the main method if you plan on running it as a standalone Java application. In Eclipse you can use the Applet runner to run your applets directy as well. It's Run As -> Java Applet.