JDK Differences

java 1.5 ve java 1.4

1)    Auto boxing/unboxing
2)    Generics
3)    Annotations
4)     java.util.concurrent
5)    enum
6)    variable number of arguments
7)    new for loop
8)    import static
9)    printf    

java 1.6 vs java 1.5

1)    Improvements and performance
2)     Embedded Java DB (based on apache derby )
3)     swing

java 1.7 vs java 1.6

1)    faster then java 6
2)     better garbage collector
3)    modularization
4)    autoclosable
5)    Strings are allowed in switch
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