import resources for testing
import junit libralies
add a simple testcase for ASTAnalyzer.java
create an interface to have constants
implement toString()
[BUG_FIX] fix a bug that getters in VectorData throw NullPointerException when the instance does not contain the corresponding elements
modify toString()
import SQLite JDBC
import commons-cli#
add a field for IDs in MethodData and VectorData
create a class to create database
create a directory to contain excutable jar files