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Language Basics (java.lang.*)

This category is devoted to directing you to pointers that explain the basic Java constructs and Object Oriented principles. Check out the excellent book by Bruce Eckel: Thinking in Java.

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Questions & Answers
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General:

  Where does the name Java come from?
  What is the CLASSPATH and how do I set it?
  How do I set the CLASSPATH at runtime?
  How do I get the CLASSPATH variable at runtime?
  How do I execute another java app from an already running one?
  How do I use a Windows icon to execute my Java app?
  How do I get a list of packages that have been loaded?
  What is a deprecated API?
  How do I deprecate a class or a method?
  How do I find out about the (system specific) line separator?
  How do I return a status code from my Java application?
  How do I trap CTRL-C in my Java app?
  What is the purpose of the volatile keyword?
  How do I determine the Java version at runtime?
  How do I determine the OS at runtime?
  How do I check if another instance of the same program is already running?
  How do I determine if a certain Class has been loaded?
  How do I dynamically find the path to a loaded class?
  How do I find out the classloader that loaded a particular class?
  How do I get the calling method inside a just started method?
  Can you give me an example on how and when to use clone()?
  How do I turn off the JIT compiler?
  How can I count the numbers of command-line arguments supplied at runtime?
  What is a type descriptor?
  When do I use runFinalizersOnExit?
  How do I programmatically get the Java version my app is running on?
  How do I find out what method from what class invoked the method that is currently running?
  How do I on-the-fly compile a java source contained in a String?
  How do I find out where a class has been loaded from?
  How do I get the list of environment variables?
  How do I use a shutdown hook?


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