NEED COMPILING HELP (10 duke points!!!!!!!)

Question

Hi i'm using jedit, and i need to know why my compiler isn't working. As some may know that jedit has an inbuilt compiler called jcompiler. The results from the jcompiler are fine but when i try javac i recieve an error, and when i use java i recieve an error...
error for javac:
D:\>javac haha
javac: invalid flag: haha
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are us
ed
-classpath <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-help Print a synopsis of standard options
error for java:
D:\>java haha
Exception in thread "main" java.lang.NoClassDefFoundError: haha
the program:
class try {
     public static void main (String [] args) {
          System.out.println("Hello World");
}To the perosn or persons who completely solve my problem, they recieve 10 points (btw i made the prog haha in 30 secs but i'm still a beginner (a student) in java )

Answer 1

HelloWorld.java :
public class HelloWorld {
  public static void main (String [] args) {
    System.out.println("Hello World");
}d:\somedir> dir
0:00 10101 HelloWorld.java
d:\somedir> javac HelloWorld.java
d:\somedir> dir
0:00 10101 HelloWorld.java
0:00 10101 HelloWorld.class
d:\somedir> java HelloWorld
Hello World
-Alexis