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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

Discontinuing use of the underscore

The underscore character ( _ ) can no longer be used as a legal identifier name. Earlier attempts to remove the underscore in an identifier name were incomplete. The use of such would generate a combination of errors and warnings. With Java 9, the warnings are now errors. Consider the following sample code:

    public class Java9Tests     {       public static void main(String[] args)       {        int _ = 319;        if ( _ > 300 )        {          System.out.println("Your value us greater than 300.");         }         else         {          System.out.println("Your value is not greater than 300.");        }      }    }

The preceding code, in Java 8, will result in compiler warnings for int _ = 319; and if ( _ > 300 ) statements. The warning is as of release 9, '_' is a keyword, and may ...

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Publisher Resources

ISBN: 9781788832823Supplemental ContentOtherPurchase LinkErrata Page