Project Coin was a feature set of minor changes introduced in Java 7. These changes are listed as follows:

• Strings in switch statements
• Binary integral literals
• Using underscores in numeric literals
• Implementing multi-catch
• Allowing for more precise rethrowing of exceptions
• Generic instance creation improvements
• Addition of the try-with-resource statement
• Improvements to invoking varargs methods

Detailed information can be found in the following Oracle presentation (http://www.oracle.com/us/technologies/java/project-coin-428201.pdf).

For the Java 9 release, there were five improvements to Project Coin. These enhancements are detailed in the sections that follow.