src/share/classes/java/lang/String.java

*** 1750,1772 ****
          if (targetCount == 0) {
              return fromIndex;
          }
  
          char first = target[targetOffset];
          int max = sourceOffset + (sourceCount - targetCount);
  
          for (int i = sourceOffset + fromIndex; i <= max; i++) {
              /* Look for first character. */
              if (source[i] != first) {
                  while (++i <= max && source[i] != first);
              }
! 
              /* Found first character, now look at the rest of v2 */
!             if (i <= max) {
!                 int j = i + 1;
!                 int end = j + targetCount - 1;
!                 for (int k = targetOffset + 1; j < end && source[j]
                          == target[k]; j++, k++);
  
                  if (j == end) {
                      /* Found whole string. */
                      return i - sourceOffset;
--- 1750,1778 ----
          if (targetCount == 0) {
              return fromIndex;
          }
  
          char first = target[targetOffset];
+         char second = 0;
+         if (targetCount != 1) {
+             second = target[targetOffset + 1];
+         }
          int max = sourceOffset + (sourceCount - targetCount);
  
          for (int i = sourceOffset + fromIndex; i <= max; i++) {
              /* Look for first character. */
              if (source[i] != first) {
                  while (++i <= max && source[i] != first);
              }
!             if (targetCount == 1) {
!                 return (i <= max) ? i - sourceOffset : -1;
!             }
              /* Found first character, now look at the rest of v2 */
!             if (i <= max && source[i + 1] == second) {
!                 int j = i + 2;
!                 int end = i + targetCount;
!                 for (int k = targetOffset + 2; j < end && source[j]
                          == target[k]; j++, k++);
  
                  if (j == end) {
                      /* Found whole string. */
                      return i - sourceOffset;