java packages
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  • 1. Pre-Defined Packages Networking Java.net Remote Method Invocation Java.rmi Java Data Base Connectivity Java.jdbc Swings Java.swings ADV AWT, Applets, Events and Layouts Java.awt Collections Java.util part 2 Utility Classes Java.util part-1 IO Streams Java.io Fundas, and Exceptions Java.lang CORE J2SE
  • 2. Java.lang Package
    • This is a default package, which means that the package is automatically imported into the java program.
    • Hence the classes from this can be directly accessed.
    • This has classes that can be used for basic usage, and system control.
  • 3. Classes in java.lang
    • Object
    • System
    • String
    • Math
    • Throwable
    • Exception
    • Runnable
    • Thread
    • Wrapper Classes
      • Integer
      • Byte
      • Boolean
      • Character
      • Float
      • Double
      • … . etc
  • 4. public class java.lang.Object
    • This is the default super class for any java class. If a java class has no super class, then it is forced to extened Object , or if the class has a super class, that super class will come into the hierarchy of Object class. Thus this will be a super class for any java class.
    • Methods (All of The Below Are public)
      • String toString()
      • Object clone()
      • void wait()
      • void yeild()
  • 5. public class java.lang.System
    • Public Members
      • java.io.PrintWriter out
      • java.io.InputStream in
      • Java.io.InputStream err
    • Public Methods
      • static void exit(int)
      • static void gc()
      • static void load(String)
  • 6. public final class java.lang.String
    • Public Constructors
      • String()
      • String(char[])
      • String(byte[])
    • Public Methods
      • int length()