http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.4

http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-5.html

http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-2.html#jvms-2.5.5

The Run-Time Constant Pool The Constant Pool