For the download of latest java documentation(jdk-8u77) API
Navigate to http://www.oracle.com/technetwork/java/javase/downloads/index.html
Under Addition Resources and Under Java SE 8 Documentation
Click Download button
Under Java SE Development Kit 8 Documentation > Java SE Development Kit 8u77 Documentation
Accept the License Agreement and click on the download zip file
Unzip the downloaded file
Start the API docs from
jdk-8u77-docs-all\docs\api\index.html
For the other java versions api download, follow the following steps.
Navigate to http://docs.oracle.com/javase/
From Release dropdown select either of Java SE 7/6/5
In corresponding JAVA SE page and under Downloads left side menu
Click JDK 7/6/5 Documentation or Java SE Documentation
Now in next page select the appropriate Java SE Development Kit 7uXX Documentation.
Accept License Agreement and click on Download zip file
Unzip the file and Start the API docs from
jdk-7uXX-docs-all\docs\api\index.html