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Below enhancements/fixes are based on JEP-325

1. New hint to convert switch-cases to rule kind cases
   
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   After implementing the hint fix
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2. New hint to convert mixed case kind in Switch-Expression/Switch-Cases to rule kind cases 
   All mixed kind of cases (JDK-12 & above)( i.e., having both :  and  -> )   will be converted to rule(->) kind cases
   
   hint  for converting mixed case type in Switch to rule kind cases. 
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   After implementing the error fix:
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   Hint for converting mixed type in Switch expression to to rule kind cases.
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   After implementing the error fix:
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3. Formatting and re-Formatting and correct re indentation of Switch-Expression and Rule Switch.
     a. switch-expression before formatting :
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   switch-expression after formatting :
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   b. switch-expression with rule cases before formatting:
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   switch-expression with rule cases after formatting:
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4. Auto complete of enum case values in Switch-Expression
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Bug-Fixes:

1. NETBEANS-1728: ClassCastException in Switch Expression
2. NETBEANS-1674: NPE thrown while formatting the switch expression

Steps to enable preview features in NetBeans IDE :

1. Goto Project → Properties
2. Goto Build → Compiling pane : Uncheck 'Run Compilation in External VM' and Add '--enable-preview' in Additional Compiler Options
3. Goto Run pane : Add '--enable-preview' in VM Options