How do I create a family tree form online?

ANTLR: Which is the best parser  for Java to create AST (Abstract Syntax tree?

• I want to create AST(Abstract Syntax Tree) form java source.I am thinking of using Antlr what are its pros and cons

• Answer:

  You can leverage the javac compiler's API to get an AST and walk the tree nodes. Sun released the http://docs.oracle.com/javase/6/docs/jdk/api/javac/tree/ in Java 6 that lets you hook Annotation Parsers, which run after the parsing phase of the Java compiler (which can also be invoked programatically rather than through the command-line). Although this API was intended to pre-process annotations and modify the source code... it can also be used for general AST analysis since you can basically visit every node of the AST.