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Java 9: Building Robust Modular Applications
book

Java 9: Building Robust Modular Applications

by Dr. Edward Lavieri, Peter Verhas, Jason Lee
April 2018
Intermediate to advanced content levelIntermediate to advanced
910 pages
33h 21m
English
Packt Publishing
Content preview from Java 9: Building Robust Modular Applications

Working with variable handlers [JEP 193]

Variable handlers are typed references to variables and are governed by the java.lang.invoke.VarHandle abstract class. The VarHandle method's signature is polymorphic. This provides for great variability in both method signatures and return types. Here is a code sample demonstrating how a VarHandle might be used:

    . . .     class Example     {      int myInt;      . . .     }    . . .     class Sample     {      static final VarHandle VH_MYINT;      static       {        try         {          VH_MYINT =              MethodHandles.lookup().in(Example.class)            .findVarHandle(Example.class, "myInt", int.class);        }         catch (Exception e)         {          throw new Error(e);        }      }    }    . . . 

As you can see in the preceding code snippet, the VarHandle.lookup() performs the same operation as those that ...

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