src/java.base/share/classes/java/util/Properties.java

rev 16769 : 8176041: Optimize handling of comment lines in Properties$LineReader.readLine
Reviewed-by: TBD

*** 492,503 ****
                      appendedLineBegin = false;
                  }
                  if (isNewLine) {
                      isNewLine = false;
                      if (c == '#' || c == '!') {
                          isCommentLine = true;
-                         continue;
                      }
                  }
  
                  if (c != '\n' && c != '\r') {
                      lineBuf[len++] = c;
--- 492,516 ----
                      appendedLineBegin = false;
                  }
                  if (isNewLine) {
                      isNewLine = false;
                      if (c == '#' || c == '!') {
+                         // Comment, quickly consume the rest of the line,
+                         // resume on line-break and backslash.
+                         while (inOff < inLimit) {
+                             if (inStream != null) {
+                                 //The line below is equivalent to calling a
+                                 //ISO8859-1 decoder.
+                                 c = (char) (0xff & inByteBuf[inOff++]);
+                             } else {
+                                 c = inCharBuf[inOff++];
+                             }
+                             if (c == '\n' || c == '\r' || c == '\\') {
+                                 break;
+                             }
+                         }
                          isCommentLine = true;
                      }
                  }
  
                  if (c != '\n' && c != '\r') {
                      lineBuf[len++] = c;