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Java StringBuilder setLength()

By Chaitanya Singh | Filed Under: java

Java StringBuilder setLength() method is used to set a new length to the existing StringBuilder 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(5); //set the length of sb to 5

Here, sb represents the object of Java StringBuilder class.

setLength() Description

public void setLength(int newLength): Changes the length of the current StringBuilder 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.
  • It throws IndexOutOfBoundsException, if the specified newLength is a negative number.

Example 1: When new length is less than old length

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

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

Output:

Java StringBuilder setLength() Example Output_1

Example 2: When new length is greater than old length

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

    //Set new length for this char sequence
    sb.setLength(20);

    // 7 null characters are appended at the end
    System.out.println("New String: "+sb);
    System.out.println("New length: "+sb.length());
  }
} 

Output:

Java StringBuilder setLength() Example Output_2

Example 3: When new length is negative

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

Output:

Java StringBuilder setLength() Example Output_3

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