StringBuilder class ~ foundjava

StringBuilder is identical to StringBuffer except for one important difference it is not synchronized, which means it is not thread safe. Its because StringBuilder methods are not synchronised.

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StringBuilder Constructors

1. StringBuilder ( ), creates an empty StringBuilder and reserves room for 16 characters.
2. StringBuilder ( int size ), create an empty string and takes an integer argument to set capacity of the buffer.
3. StringBuilder ( String str ), create a StringBuilder object and initialize it with string str.

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Difference between StringBuffer and StringBuilder class

StringBuffer class	StringBuilder class
StringBuffer is synchronized.	StringBuilder is not synchronized.
Because of synchronisation, StringBuffer operation is slower than StringBuilder.	StringBuilder operates faster.

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Example of StringBuilder

class Test {
 public static void main(String args[])
 {
  StringBuilder str = new StringBuilder("study");
  str.append( "tonight" );
  System.out.println(str);
  str.replace( 6, 13, "today");
  System.out.println(str);
  str.reverse();
  System.out.println(str);
  str.replace( 6, 13, "today");
 }
}

Output :

studytonight 
studyttoday
yadottyduts