modify build.xml
change structure
change structure
add lib
Merge branch 'master' of https://github.com/ProtossJane/cs56-math-conversion-quiz

commit
modify build.xml
modify build.xml
add DocumentListener to show hint
refine the hints
add switcher to show or hide hint
add javadoc comment
delete content relevant to jws in build
change the constructor function in submit button listener
remove javadoc
delete temp file
fix all conflict merge
Merge pull request #7 from ProtossJane/master

prog1 submission