March 20, 1997

Question: How do you calculate sqrt()? Answer: Of course the best way to compute square roots is to useMath.sqrt(),but I assume your question is academic. I’m not sure of the

Question: Can JavaScript be used to access the client’s printer? Answer: No. JavaScript was designed so that malicious JavaScript programmers would have very little power to make their victims miserable.

Question: How do I use the .net classes to log on to a mailserver and request, say, the number of new mailmessages? Or send a message?Just POP3/SMTP. An example would

Question: Is it possible to launch another application from aJava application (not an applet)? Answer: Yes. There are two classes of interest for performingsystem level functions such as this: java.lang.Runtime

Question: What is the purpose of the Thread.interrupt()method? I expect that if I call the interrupt()method of a sleeping thread, anInterruptedException will be thrown. Here is aquick code sample showing

Question: How do you lock a file in Java to prevent simultaneous multipleaccesses? Answer: If you’re concerned about simultaneous access by independent processes,you’ll have to rely on the host OS

Question: I have a server application listening for clientapplets to connect. The server spawns a new thread each timea connection to a client is established. I want to keeptrack, i.e.

Question: I want a copy of an instance not a reference, e.g.(Image). Iknow of the clone method, but not many classes have it. Along those lines,does Java pass objects to

Question: Is there a way to determine the number ofinstantiated objects of a certain class? Answer: Unfortunately, there are no methods of class Object orClass thattrack the number of extant