Class DefaultComesLastCheck

Check that the default is after all the cases in a switch statement.

Rationale: Java allows default anywhere within the switch statement. But it is more readable if it comes after the last case.

• Property skipIfLastAndSharedWithCase - Control whether to allow default along with case if they are not last. Type is boolean. Default value is false.

To configure the check:

 <module name="DefaultComesLast"/>
 

Example:

 switch (i) {
   case 1:
     break;
   case 2:
     break;
   default: // OK
     break;
 }

 switch (i) {
   case 1:
     break;
   case 2:
     break; // OK, no default
 }

 switch (i) {
   case 1:
     break;
   default: // violation, 'default' before 'case'
     break;
   case 2:
     break;
 }

 switch (i) {
   case 1:
   default: // violation, 'default' before 'case'
     break;
   case 2:
     break;
 }
 

To configure the check to allow default label to be not last if it is shared with case:

 <module name="DefaultComesLast">
   <property name="skipIfLastAndSharedWithCase" value="true"/>
 </module>
 

Example:

 switch (i) {
   case 1:
     break;
   case 2:
   default: // OK
     break;
   case 3:
     break;
 }

 switch (i) {
   case 1:
     break;
   default: // violation
   case 2:
     break;
 }

 // Switch rules are not subject to fall through, so this is still a violation:
 switch (i) {
   case 1 -> x = 9;
   default -> x = 10; // violation
   case 2 -> x = 32;
 }
 

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

• default.comes.last
• default.comes.last.in.casegroup