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Java StringBuffer setLength() Method

By Chaitanya Singh | Filed Under: java

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:

Java StringBuffer setLength() Example Output_1

Example 2: If new length is greater 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(21);

    // 8 null characters are appended at the end
    System.out.println("New Sequence: "+sb);
    System.out.println("New length: "+sb.length());
  }
}

Output:

Java StringBuffer setLength() Example Output_2

Example 3: If specified length is negative

public class JavaExample {
  public static void main(String[] args) {
    StringBuffer sb = new StringBuffer("Hello");
    //New length is negative
    sb.setLength(-2);
    System.out.println("New String: "+sb);
    System.out.println("New length: "+sb.length());
  }
}

Output:

Java StringBuffer setLength() Example Output_3

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❮ Java StringBuffer

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