What are javadoc, apt, JML, and LINQ, and what do they have to do with annotation? Briefly describe three different implementation strategies for a symbolic debugger. Explain the difference between...

What are javadoc, apt, JML, and LINQ, and what do they have to do with annotation? Briefly describe three different implementation strategies for a symbolic debugger. Explain the difference between breakpoints and watchpoints. Why are watchpoints potentially much more expensive?