StringBuilder
StringBuilder is identical to StringBuffer except it is not synchronized. StringBuilder is not thread-safe. StringBuilder is faster than StringBuffer.
Create StringBuilder object
StringBuilder()- Creates a string builder and an initial capacity of 16 characters.
StringBuilder(CharSequence seq)- Creates a string builder from the specified CharSequence.
StringBuilder(int capacity)- Creates a string builder with no characters in it and an initial capacity specified by the capacity argument.
StringBuilder(String str)- Creates a string builder initialized to the contents of the specified string.
Append and insert value to StringBuilder
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.
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.
Capacity and length
int capacity()- Returns the current capacity.
int length()- Returns the length (character count).
void ensureCapacity(int minimumCapacity)- Ensures that the capacity is at least equal to the specified minimum.
void setLength(int newLength)- Sets the length of the character sequence.
void trimToSize()- Attempts to reduce storage used for the character sequence.
Search sub string
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.
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.
Chars in StringBuilder
char charAt(int index)- Returns the char value in this sequence at the specified index.
void setCharAt(int index, char ch)- The character at the specified index is set to ch.
void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)- Characters are copied from this sequence into the destination character array dst.
Delete and replace and reverse
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.
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.
Get Sub string from StringBuilder
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.
Convert StringBuilder to String
String toString()- Returns a string representing the data in this sequence.