title: Cannot compile a Java program command-line
body: <p>I tried the following in cl:</p>
  
  <p><code>javac Main.java</code></p>
  
  <p>The shell gives an error that "javac" is not a recognized command.  I know for a fact I have the Java Platform installed.  What could be wrong?</p>
  
  <p>(I use "cd" to set the directory first)</p>