The choice of language system impacts the robustness of any software program.The Java language  and virtual machine  provide many features to mitigate common programming mistakes.The language is type-safe, and the runtime provides automatic memory management and bounds-checking on arrays.Java programs and libraries check for illegal state at the earliest opportunity.
For more information about the security baseline, see Deploying Java Applets With Family JRE Versions in Java Plug-in for Internet Explorer .
The full internal version number for this update release is 1.6.0_18-b07 (where "b" means "build"). 6u18 specifies the following security baselines for use with Java Plug-in technology: On October 30, 2008, Java SE 1.4.2 reached its end of service life with the release of 1.4.2_19.
For more information, refer to Timezone Data Versions in the JRE Software .
There will be a minor behavioral difference if deprecated methods are used.
In this case, there will be deprecation warnings at compilation.