That class is used by the JVM (it compiles bytecode to native code if a JIT is present), so there is no example one could give for client code that uses it.
If you are trying to compile Java source code at runtime, your code could use the classes that make up the javac compiler. That approach is described here.
Or stick your neck out and use Java 6 (pre-release) which has a new javax.tools package which includes compiling.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
