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I need to programmatically extract method definition/implementation from Java source file, could you recommend any handy library that I can use? Thanks.
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What is parse in Java? There are many Java classes that have the parse() method. Usually the parse() method receives some string as input, "extracts" the necessary information from it and converts it into an object of the calling class.
There are three ways of parsing in Java: Using an existing library. Using a tool or library to build a parser. By building a custom parser from scratch.
A parser is a Java class that extracts attributes from a local file and stores the information in the repository. More specifically, in the case of a document, a parser: Takes in an InputStream or Reader object. Processes the character input, extracting attributes as it goes.
To parse a string in Java, you can use the Java String split() method, Java Scanner class, or StringUtils class. For parsing a string based on the specified condition, these methods use delimiters to split the string.
ANTLR is a parser/generator that has grammars for Java (and other languages). It can produce an abstract syntax tree (AST) that you can navigate and manipulate as you wish.
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Another option is Jflex and CUP. As per my usage experience, I liked the syntax more than ANTLR. However ANTLR scores more when it comes to IDE support and documentation..
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