In the first year since its release Java 7 has achieved a global share of around 79% with Japan and Germany showing the greatest levels of adoption.
The statistics in thse charts are from the cloud hosting company Jelastic and show that in all regions Java 7 now dominates over Java 6 with Java 7 overtaking Java 6 in March 2012.
Commenting on the overall Java distribution on his blog, Henrik Stahl notes:
While this is a single data point and should not be read too broadly, it does match other indicators we have that Java 7 is picking up, such as uptake among Oracle middleware customers, download statistics and online activity. The spike in adoption in April coincided with the release of JDK 7 Update 4. This is in line with our expectations since that release added Mac OS X support as well as java.com moving to Java 7 as the default download for end-users; two events that marked the maturity of Java 7 to the community.