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StringBuilder

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Constructors
Constructor and Description
`StringBuilder()` Constructs a string builder with no characters in it and an initial capacity of 16 characters.
`StringBuilder(CharSequence seq)` Constructs a string builder that contains the same characters as the specified `CharSequence`.
`StringBuilder(int capacity)` Constructs a string builder with no characters in it and an initial capacity specified by the `capacity` argument.
`StringBuilder(String str)` Constructs a string builder initialized to the contents of the specified string.

Method Summary

Methods
Modifier and Type	Method and Description
`StringBuilder`	`append(boolean b)` Appends the string representation of the `boolean` argument to the sequence.
`StringBuilder`	`append(char c)` Appends the string representation of the `char` argument to this sequence.
`StringBuilder`	`append(char[] str)` Appends the string representation of the `char` array argument to this sequence.
`StringBuilder`	`append(char[] str, int offset, int len)` Appends the string representation of a subarray of the `char` array argument to this sequence.
`StringBuilder`	`append(CharSequence s)` Appends the specified character sequence to this `Appendable`.
`StringBuilder`	`append(CharSequence s, int start, int end)` Appends a subsequence of the specified `CharSequence` to this sequence.
`StringBuilder`	`append(double d)` Appends the string representation of the `double` argument to this sequence.
`StringBuilder`	`append(float f)` Appends the string representation of the `float` argument to this sequence.
`StringBuilder`	`append(int i)` Appends the string representation of the `int` argument to this sequence.
`StringBuilder`	`append(long lng)` Appends the string representation of the `long` argument to this sequence.
`StringBuilder`	`append(Object obj)` Appends the string representation of the `Object` argument.
`StringBuilder`	`append(String str)` Appends the specified string to this character sequence.
`StringBuilder`	`append(StringBuffer sb)` Appends the specified `StringBuffer` to this sequence.
`StringBuilder`	`appendCodePoint(int codePoint)` Appends the string representation of the `codePoint` argument to this sequence.
`int`	`capacity()` Returns the current capacity.
`char`	`charAt(int index)` Returns the `char` value in this sequence at the specified index.
`int`	`codePointAt(int index)` Returns the character (Unicode code point) at the specified index.
`int`	`codePointBefore(int index)` Returns the character (Unicode code point) before the specified index.
`int`	`codePointCount(int beginIndex, int endIndex)` Returns the number of Unicode code points in the specified text range of this sequence.
`StringBuilder`	`delete(int start, int end)` Removes the characters in a substring of this sequence.
`StringBuilder`	`deleteCharAt(int index)` Removes the `char` at the specified position in this sequence.
`void`	`ensureCapacity(int minimumCapacity)` Ensures that the capacity is at least equal to the specified minimum.
`void`	`getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)` Characters are copied from this sequence into the destination character array `dst`.
`int`	`indexOf(String str)` Returns the index within this string of the first occurrence of the specified substring.
`int`	`indexOf(String str, int fromIndex)` Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
`StringBuilder`	`insert(int offset, boolean b)` Inserts the string representation of the `boolean` argument into this sequence.
`StringBuilder`	`insert(int offset, char c)` Inserts the string representation of the `char` argument into this sequence.
`StringBuilder`	`insert(int offset, char[] str)` Inserts the string representation of the `char` array argument into this sequence.
`StringBuilder`	`insert(int index, char[] str, int offset, int len)` Inserts the string representation of a subarray of the `str` array argument into this sequence.
`StringBuilder`	`insert(int dstOffset, CharSequence s)` Inserts the specified `CharSequence` into this sequence.
`StringBuilder`	`insert(int dstOffset, CharSequence s, int start, int end)` Inserts a subsequence of the specified `CharSequence` into this sequence.
`StringBuilder`	`insert(int offset, double d)` Inserts the string representation of the `double` argument into this sequence.
`StringBuilder`	`insert(int offset, float f)` Inserts the string representation of the `float` argument into this sequence.
`StringBuilder`	`insert(int offset, int i)` Inserts the string representation of the second `int` argument into this sequence.
`StringBuilder`	`insert(int offset, long l)` Inserts the string representation of the `long` argument into this sequence.
`StringBuilder`	`insert(int offset, Object obj)` Inserts the string representation of the `Object` argument into this character sequence.
`StringBuilder`	`insert(int offset, String str)` Inserts the string into this character sequence.
`int`	`lastIndexOf(String str)` Returns the index within this string of the rightmost occurrence of the specified substring.
`int`	`lastIndexOf(String str, int fromIndex)` Returns the index within this string of the last occurrence of the specified substring.
`int`	`length()` Returns the length (character count).
`int`	`offsetByCodePoints(int index, int codePointOffset)` Returns the index within this sequence that is offset from the given `index` by `codePointOffset` code points.
`StringBuilder`	`replace(int start, int end, String str)` Replaces the characters in a substring of this sequence with characters in the specified `String`.
`StringBuilder`	`reverse()` Causes this character sequence to be replaced by the reverse of the sequence.
`void`	`setCharAt(int index, char ch)` The character at the specified index is set to `ch`.
`void`	`setLength(int newLength)` Sets the length of the character sequence.
`CharSequence`	`subSequence(int start, int end)` Returns a new character sequence that is a subsequence of this sequence.
`String`	`substring(int start)` Returns a new `String` that contains a subsequence of characters currently contained in this character sequence.
`String`	`substring(int start, int end)` Returns a new `String` that contains a subsequence of characters currently contained in this sequence.
`String`	`toString()` Returns a string representing the data in this sequence.
`void`	`trimToSize()` Attempts to reduce storage used for the character sequence.

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