Java StringBuffer setLength() Method

Java StringBuffer setLength() method is used to set a new length to the existing StringBuffer sequence. If the new length is greater than the current length then null characters are appended at the end of the sequence.

Syntax of setLength() Method:

sb.setLength(4); //set the length of sb to 4

Here, sb represents the object of Java StringBuffer class.

setLength() Description

public void setLength(int newLength): Changes the length of the current StringBuffer instance to the new length.

setLength() Parameters

• newLength: It is an integer value that represents the new length.

setLength() Return Value

• It has void return type as it does not return anything.
• If specified newLength is a negative number then It throws IndexOutOfBoundsException.

Example 1: If specified length is less than existing length

public class JavaExample {
  public static void main(String[] args) {
    StringBuffer sb = new StringBuffer("BeginnersBook");
    System.out.println("Old Sequence: "+sb);
    System.out.println("Old length: "+sb.length());

    //Set new length for this char sequence
    sb.setLength(9);
    System.out.println("New Sequence: "+sb);
    System.out.println("New length: "+sb.length());
  }
}

Output: