Important methods in StringBuilder class

The following API annotations contain important methods in the StringBuilder class
append(boolean b): Append the string representation of the boolean parameter to the sequence .
Append(char c): Appends the string representation of the char parameter to this sequence.
Append(char[] str): Appends the string representation of the char array parameter to this sequence.
Append(char[] str, int offset, int len): Appends the string representation of the subarray of the char array parameter to this sequence.
Append(CharSequence s): Appends the specified character sequence to this Appendable.
Append(CharSequence s, int start, int end): Append the subsequence of the specified CharSequence to this sequence.
Append(double d): Appends the string representation of the double parameter to this sequence.
Append(float f): Appends the string representation of the float parameter to this sequence.
Append(int i): Appends the string representation of the int parameter to this sequence.
Append(long lng): Appends the string representation of the long parameter to this sequence.
Append(Object obj): Append the string representation of the Object parameter.
Append(String str): Append the specified string to this character sequence.
Append(StringBuffer sb): Append the specified StringBuffer to this sequence.
appendCodePoint(int codePoint): Appends the string representation of the codePoint parameter to this sequence.
　capacity(): Returns the current capacity.
charAt(int index): Returns the char value at the specified index in this sequence.
　codePointAt(int index): Returns the character (unified code point) at the specified index.
　codePointBefore(int index): Returns the character before the specified index (unified code point).
　codePointCount(int beginIndex, int endIndex): Returns the unified code points within the specified text range of this sequence.
Delete(int start, int end): Remove characters from the substring of this sequence.
deleteCharAt(int index): Remove the char at the specified position in this sequence.
ensureCapacity(int minimumCapacity): Ensure that the capacity is at least equal to the specified minimum value.
　getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin): Copy characters from this sequence to the target character array dst.
IndexOf(String str): Returns the index of the first occurrence of the specified substring in the string.
IndexOf(String str, int fromIndex): Starting from the specified index, return the index of the first occurrence of the specified substring in the string.
insert(int offset, boolean b): Insert the string representation of the boolean parameter into this sequence.
　insert(int offset, char c): Inserts the string representation of the char parameter into this sequence.
　insert(int offset, char[] str): Inserts the string representation of the char array parameter into this sequence.
　insert(int index, char[] str, int offset, int len): Insert the string representation of the array parameter str subarray into this sequence.
　insert(int dstOffset, CharSequence s): Insert the specified CharSequence into this sequence.
　insert(int dstOffset, CharSequence s, int start, int end): Insert the subsequence of the specified CharSequence into this sequence.
insert(int offset, double d): Insert the string representation of the double parameter into this sequence.
　insert(int offset, float f): Inserts the string representation of the float parameter into this sequence.
　insert(int offset, int i): Inserts the string representation of the int parameter into this sequence.
insert(int offset, long l): Insert the string representation of the long parameter into this sequence.
insert(int offset, Object obj): Insert the string representation of the Object parameter into this character sequence.
insert(int offset, String str): Insert a string into this character sequence.
lastIndexOf(String str): Returns the index of the rightmost specified substring in this string.
lastIndexOf(String str, int fromIndex): Returns the index of the last occurrence of the specified substring in this string.
　length(): Returns the length (number of characters).
offsetByCodePoints(int index, int codePointOffset): Returns an index in this sequence that is offset by codePointOffset code points from the given index.
Replace(int start, int end, String str): Replace the characters in the substring of this sequence with the characters in the given String.
Reverse(): Replace this character sequence with its reversed form.
setCharAt(int index, char ch): Sets the character at the given index to ch.
setLength(int newLength): Set the length of the character sequence.
　subSequence(int start, int end): Returns a new character sequence that is a subsequence of this sequence.
　substring(int start): Returns a new String that contains the subsequence of characters currently contained in this character sequence.
Substring(int start, int end): Returns a new String that contains a subsequence of characters currently contained in this sequence.
toString(): Returns the string representation of the data in this sequence.
trimToSize(): Try to reduce the storage space used for character sequences.

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