Any tools to convert .class files to .java files

[fgs infotech]

Any tools available to convert .class files to .java files .I just want tools .I know Borland JBuilder can convert it .But for this purpose I cannot get a Borland JBuilder complete version. Anyone can just give me the executable file ?Please Due to some errors I lost a lot of codings and when I just want to write an extension to it I cannot do it. Help me out of this? As soon as possible, Thanks n Thanks in advance , Sara