Something

jdwannam@opennms2:/tmp$ cat DateTest.java 
import java.util.*;
 public class DateTest { public static void main(String[] args) { System.out.println( new Date().toString() + "\n" ); } }
jdwannam@opennms2:/tmp$ which javac
/usr/bin/javac
jdwannam@opennms2:/tmp$ /usr/bin/javac /tmp/DateTest.java
jdwannam@opennms2:/tmp$ which java
/usr/bin/java
jdwannam@opennms2:/tmp$ /usr/bin/java /tmp/DateTest.java
Exception in thread "main" java.lang.NoClassDefFoundError: /tmp/DateTest/java
jdwannam@opennms2:/tmp$