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StringBuilder in Scala

Last Updated : 29 Mar, 2019
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A String object is immutable, i.e. a String cannot be changed once created. In situations where you need to perform repeated modifications to a string, we need StringBuilder class. StringBuilder is utilized to append input data to the internal buffer. We can perform numerous operations with the support of methods on the StringBuilder. This operation comprises appending data, inserting data, and removing data. important points:
  • The StringBuilder class is beneficent for mutable strings to extend effectively.
  • The instance of StringBuilder is utilized like a String.
  • Strings of Scala are immutable so, when you require a mutable String then you can use StringBuilder.
Operations performed by the StringBuilder class
  • Appending character: This operation is helpful in appending character. Example: Scala 
    // Scala program to append // a character // Creating object  object GFG {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val x = new StringBuilder("Author");  // Appending character   val y = (x += 's')  // Displays the string after   // appending the character   println(y)  } }
    Output: 
     Authors
    Here, (x += ' ') is utilized to append a character.
  • Appending String: This operation is helpful in appending string. Example: Scala 
    // Scala program to append // a String // Creating object  object GFG {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val x = new StringBuilder("Authors");  // Appending String   val y = (x ++= " of GeeksforGeeks")  // Displays the string after   // appending the string   println(y)  } }
    Output: 
     Authors of GeeksforGeeks
    Here, (x ++= ' ') is utilized to append String.
  • Appending String representation of number: Here, the number can be of any type like Integer, Double, Long, Float, etc. Example: Scala 
    // Scala program to append // String representation  // of number // Creating object  object num {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val x = new StringBuilder("Number of Contributors : ");  // Appending String   // representation of number   val y = x.append(800)  // Displays the string after   // appending the number  println(y)  } }
    Output: 
     Number of Contributors : 800
    Here, x.append(n) is utilized to append the String representation of the number, where 'n' is the number of any type.
  • Resetting the content of the StringBuilder: It is helpful in resetting the content by making it empty. Example: Scala 
    // Scala program to reset  // the content // Creating object  object GFG {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val x = new StringBuilder("Hello")  // Resetting the content   val y = x.clear()   // Displays empty content  println(y)  } }
    Output: 
     ()
    Here, x.clear() is utilized to clear the content of the StringBuilder.
  • Delete operation: This operation is helpful in deleting characters from the content of the StringBuilder. Example: Scala 
    // Scala program to perform  // delete operation // Creating object  object delete {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val q = new StringBuilder("Computer Science")  // Deleting characters   val r = q.delete(1, 3)   // Displaying string after   // deleting some characters  println(r)  } }
    Output: 
     Cputer Science
    Here, q.delete(i, j) is utilized to delete the character indexed from i to (j - 1).
  • Insertion operation: This operation is helpful in inserting Strings. Example: Scala 
    // Scala program to perform  // insertion operation // Creating object  object insert {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val q = new StringBuilder("GfG CS portal")  // inserting strings   val r = q.insert(4, "is a " )   // Displays string after   // insertion of required   // string  println(r)  } }
    Output: 
     GfG is a CS portal
    Here, q.insert(i, "s") is utilized to insert the String (s) at index i.
  • Converting StringBuilder to a String: StringBuilder can be converted to a String using this operation. Example: Scala 
    // Scala program of Converting  // StringBuilder to a String // Creating object  object builder {  // Main method  def main(args: Array[String])  {  // Creating StringBuilder   val q = new StringBuilder("GeeksforGeeks")  // Applying conversion   // operation   val r = q.toString  // Displays String  println(r)  } }
    Output: 
     GeeksforGeeks
    Here, q.toString is utilized to convert StringBuilder to a string.

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