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Java Language  
Java Collections  
Java Concurrency  
Java.util.concurrent  
Java Date and Time  
Java Exception Handling  
Java Generics  
Java Internationalization  
Java IO  
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Java Logging  
Java Multithreaded Servers  
Java Networking  
Java NIO  
Java Persistence  
Java Reflection  
Java Regular Expressions (regex)  
Java XML   

Core java

Java Collections Framework 

Internationalization

2D Graphics

Sound

Exceptions in Java

Threads in java

Java Beans

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IDL


Servlets


Jar Files


Java Native Interface


Reflections

XML in java

 

Spring tutorial 

 

JAXB tutorial

 

Class libraries