src/share/classes/sun/tools/java/Scanner.java

*** 509,518 ****
--- 509,519 ----
  
      /**
       * Scan a number. The first digit of the number should be the current
       * character.  We may be scanning hex, decimal, or octal at this point
       */
+     @SuppressWarnings("fallthrough")
      private void scanNumber() throws IOException {
          boolean seenNonOctal = false;
          boolean overflow = false;
          boolean seenDigit = false; // used to detect invalid hex number 0xL
          radix = (ch == '0' ? 8 : 10);
*** 530,539 ****
--- 531,541 ----
  
                case '8': case '9':
                  // We can't yet throw an error if reading an octal.  We might
                  // discover we're really reading a real.
                  seenNonOctal = true;
+                 // Fall through
                case '0': case '1': case '2': case '3':
                case '4': case '5': case '6': case '7':
                  seenDigit = true;
                  putc(ch);
                  if (radix == 10) {
*** 666,675 ****
--- 668,678 ----
       * Scan a float.  We are either looking at the decimal, or we have already
       * seen it and put it into the buffer.  We haven't seen an exponent.
       * Scan a float.  Should be called with the current character is either
       * the 'e', 'E' or '.'
       */
+     @SuppressWarnings("fallthrough")
      private void scanReal() throws IOException {
          boolean seenExponent = false;
          boolean isSingleFloat = false;
          char lastChar;
          if (ch == '.') {
*** 982,991 ****
--- 985,995 ----
       */
     public long scan() throws IOException {
         return xscan();
     }
  
+     @SuppressWarnings("fallthrough")
      protected long xscan() throws IOException {
          final ScannerInputReader in = this.in;
          long retPos = pos;
          prevPos = in.pos;
          docComment = null;
*** 1004,1013 ****
--- 1008,1018 ----
                      // Do not just call in.read; we want to present
                      // a null token (and also avoid read-ahead).
                      token = COMMENT;
                      return retPos;
                  }
+                 // Fall through 
                case ' ':
                case '\t':
                case '\f':
                  ch = in.read();
                  break;