$ export JAVA_HOME=~/.jdks/corretto-21.0.3/
$ PATH=$JAVA_HOME/bin:$PATH
$ javac Test.java 

$ cat Test.java 
class Test {
  public void foo() {
    int i = 0;
    switch (i) {
      case 1 -> { // one octet remaining; add two bits and load 2 quintets
        i++;
      }
      default -> {} // Will never get here
    }
  }
}

$ java -jar checkstyle-10.20.0-all.jar -c /google_checks.xml Test.java 
Starting audit...
[WARN] /var/tmp/Test.java:5:17: '{' at column 17 should be on a new line. [LeftCurlyNl]
Audit done.

$ java -jar google-java-format-1.23.0-all-deps.jar Test.java > TestUpdated.java
$ diff -u Test.java TestUpdated.java 
# no diff

   123      if (result.length > rpos) {
   124        switch (modulus) {
   125          case 1 -> { // one octet remaining; add two bits and load 2 quintets
   126            workarea = workarea << 2;
   127            rpos = loadCodes(workarea, result, rpos, 2);
   128          }
   129          case 2 -> { // two octet remaining; add four bits and load 4 quintets
   130            workarea = workarea << 4;
   131            rpos = loadCodes(workarea, result, rpos, 4);
   132          }
   133          case 3 -> { // three octets remaining; add one bit and load 5 quintets
   134            workarea = workarea << 1;
   135            rpos = loadCodes(workarea, result, rpos, 5);
   136          }
   137          case 4 -> { // four octets remaining; add 3 bits and load 7 quintets
   138            workarea = workarea << 3;
   139            rpos = loadCodes(workarea, result, rpos, 7);
   140          }
   141          default -> {} // Will never get here
   142        }
   143      }

[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:125:19: '{' at column 19 should be on a new line. [LeftCurlyNl]
[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:129:19: '{' at column 19 should be on a new line. [LeftCurlyNl]
[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:133:19: '{' at column 19 should be on a new line. [LeftCurlyNl]
[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:137:19: '{' at column 19 should be on a new line. [LeftCurlyNl]

   246      switch (modulus) {
   247        case 0 -> { // no leftovers
   248        }
   249        case 1, // 5 bits remaining; shouldn't occur from valid encoding, so ignore
   250                2 -> // 10 bits remaining; drop two and output one octet
   251            result[pos++] = (byte) ((workarea >> 2) & MASK_8BITS);
   252        case 3 -> // 15 bits remaining; shouldn't occur from valid encoding
   253            result[pos++] = (byte) ((workarea >> 7) & MASK_8BITS);
   254        case 4 -> // 20 bits remaining; drop the last four and load 2 bytes
   255            pos = loadBytes(workarea >> 4, result, pos, 2);
   256        case 5 -> // 25 bits remaining; drop the last bit and load 3 bytes
   257            pos = loadBytes(workarea >> 1, result, pos, 3);
   258        case 6 -> // 30 bits remaining; shouldn't occur from valid encoding
   259            pos = loadBytes(workarea >> 6, result, pos, 3);
   260        case 7 -> // 35 bits remaining; drop last three and load 4 bytes
   261            pos = loadBytes(workarea >> 3, result, pos, 4);
   262        default -> { // Will never get here
   263        }
   264      }

[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:247:17: '{' at column 17 should be on a new line. [LeftCurlyNl]
[WARN] C:\projects\commons\src\main\java\org\natuna\commons\Base32.java:262:18: '{' at column 18 should be on a new line. [LeftCurlyNl]