Java 13 Features | Switch expression vs switch statement in java JDK 13

Extend switch so it can be used as either a statement or an expression, and so that both forms can use either traditional case labels (with fall through) or new case labels (with no fall through), with a further new statement for yielding a value from a switch expression.

These changes will simplify everyday coding, and prepare the way for the use of pattern matching in switch.

This was a preview language feature in JDK 12 and JDK 13.

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