refine StringUtils.center

Author: XenoAmess

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -621,9 +621,12 @@ public static String center(String str, final int size, final char padChar) {
         if (pads <= 0) {
             return str;
         }
-        str = leftPad(str, strLen + pads / 2, padChar);
-        str = rightPad(str, size, padChar);
-        return str;
+        if (pads > PAD_LIMIT) {
+            str = leftPad(str, strLen + pads / 2, String.valueOf(padChar));
+            str = rightPad(str, size, String.valueOf(padChar));
+            return str;
+        }
+        return repeat(padChar, pads / 2) + str + repeat(padChar, size - (strLen + pads / 2));
     }
 
     /**