105: THE Stringbuilder AND THE Stringbuffer CLASSES in Java

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105: THE Stringbuilder AND THE Stringbuffer CLASSES
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Constructing String Builders
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The final class StringBuilder provides four constructors that create and initialize StringBuilder objects and set their initial capacity
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StringBuilder(String str) StringBuilder(CharSequence charSeq)
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The contents of the new StringBuilder object are the same as the contents of the String object or the character sequence passed as argument The initial capacity of the string builder is set to the length of the argument sequence, plus room for 16 more characters
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StringBuilder(int length)
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The new StringBuilder object has no content The initial capacity of the string builder is set to the value of the argument length, which cannot be less than 0
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StringBuilder()
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This constructor also creates a new StringBuilder object with no content The initial capacity of the string builder is set for 16 characters Examples of StringBuilder object creation and initialization:
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StringBuilder strBuilder1 = new StringBuilder("Phew!"); StringBuilder strBuilder2 = new StringBuilder(10); StringBuilder strBuilder3 = new StringBuilder(); // "Phew!", capacity 21 // "", capacity 10 // "", capacity 16
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Reading and Changing Characters in String Builders
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int length()
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From the CharSequence interface (p 442)
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Returns the number of characters in the string builder
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char charAt(int index) void setCharAt(int index, char ch)
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From the CharSequence interface (p 442)
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These methods read and change the character at a specified index in the string builder, respectively The first character is at index 0 and the last one at index one less than the number of characters in the string builder A StringIndexOutOfBoundsException is thrown if the index is not valid
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CharSequence subSequence(int start, int end)
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This method is implemented as part of the CharSequence interface (p 442) The following is an example of reading and changing string builder contents:
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StringBuilder strBuilder = new StringBuilder("Javv"); // "Javv", capacity 20 strBuildersetCharAt(strBuilderlength()-1, strBuildercharAt(1)); // "Java"
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CHAPTER 10: FUNDAMENTAL CLASSES
Constructing Strings from String Builders
The StringBuilder class overrides the toString() method from the Object class (see also the CharSequence interface, p 442) It returns the contents of a string builder in a String object
String fromBuilder = strBuildertoString(); // "Java"
Differences between the String and StringBuilder Classes
Since the StringBuilder class does not override the equals() method from the Object class, nor does it implement the Comparable interface, the contents of string builders should be converted to String objects for string comparison The StringBuilder class also does not override the hashCode() method from the Object class Again, a string builder can be converted to a String object in order to obtain a hash value
Appending, Inserting, and Deleting Characters in String Builders
Appending, inserting, and deleting characters automatically results in adjustment of the string builder s capacity, if necessary The indices passed as arguments in the methods must be equal to or greater than 0 A StringIndexOutOfBoundsException is thrown if an index is not valid Note that the methods in this subsection return the reference value of the modified stringbuilder, making it convenient to chain calls to these methods
Appending Characters to a String Builder
The overloaded method append() can be used to append characters at the end of a string builder
StringBuilder append(Object obj)
The obj argument is converted to a string as if by the static method call StringvalueOf(obj), and this string is appended to the current string builder
StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder append(String str) append(CharSequence charSeq) append(CharSequence charSeq, int start, int end) append(char[] charArray) append(char[] charArray, int offset, int length) append(char c)
These methods allow characters from various sources to be appended to the end of the current string builder
StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder append(boolean b) append(int i) append(long l) append(float f) append(double d)
These methods convert the primitive value of the argument to a string by applying the static method StringvalueOf() to the argument, before appending the result to the string builder
105: THE Stringbuilder AND THE Stringbuffer CLASSES
Inserting Characters in a String Builder
The overloaded method insert() can be used to insert characters at a given position in a string builder
StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder StringBuilder insert(int insert(int insert(int insert(int insert(int insert(int insert(int insert(int insert(int insert(int insert(int offset, Object obj) dstOffset, CharSequence seq) dstOffset, CharSequence seq, int start, int end) offset, String str) offset, char[] charArray) offset, char c) offset, boolean b) offset, int i) offset, long l) offset, float f) offset, double d)
The argument is converted, if necessary, by applying the static method StringvalueOf() The offset argument specifies where the characters are to be inserted and must be greater than or equal to 0