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Update StringBuilder.java #3960

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Update StringBuilder.java #3960

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10 changes: 3 additions & 7 deletions vm/JavaAPI/src/java/lang/StringBuilder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -459,15 +459,11 @@ public java.lang.StringBuilder reverse(){
for (int i = 0, mid = count / 2; i < mid; i++, --end) {
char frontLow = value[i + 1];
char endHigh = value[end - 1];
boolean surAtFront = allowFrontSur && frontLow >= 0xdc00
&& frontLow <= 0xdfff && frontHigh >= 0xd800
&& frontHigh <= 0xdbff;
boolean surAtFront = allowFrontSur && Character.isSurrogatePair(frontHigh, frontLow);
if (surAtFront && (count < 3)) {
return this;
}
boolean surAtEnd = allowEndSur && endHigh >= 0xd800
&& endHigh <= 0xdbff && endLow >= 0xdc00
&& endLow <= 0xdfff;
boolean surAtEnd = allowEndSur && Character.isSurrogatePair(endHigh, endLow);
allowFrontSur = allowEndSur = true;
if (surAtFront == surAtEnd) {
if (surAtFront) {
Expand Down Expand Up @@ -524,7 +520,7 @@ public java.lang.StringBuilder reverse(){
}*/
return this;
}

/**
* The character at the specified index of this string builder is set to ch. The string builder is altered to represent a new character sequence that is identical to the old character sequence, except that it contains the character ch at position index.
* The offset argument must be greater than or equal to 0, and less than the length of this string builder.
Expand Down