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Java StringBuilder delete() method with example

StringBuilder Class delete() method: Here, we are going to learn about the delete() method of StringBuilder Class with its syntax and example.
Submitted by Preeti Jain, on December 22, 2019

StringBuilder Class delete() method

  • delete() method is available in java.lang package.
  • delete() method is used to delete characters in the given range of this sequence.
  • In this method the deleting character starts at the given index beg_idx and reaches to the characters ends at the given end_idx ends at the given end_idx-1 and there is a certain condition when beg_idx = end_idx that means in a given range no character exists to delete.
  • delete() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • delete() method may throw an exception at the time of assigning an index.
    StringIndexOutOfBoundsException - This exception may throw when the beg_idx < 0 or beg_idx is greater than the length of this array sequence or larger than the end_idx.


    public StringBuilder delete(int beg_idx , int end_idx);


  • int beg_idx – represents the starting index to delete.
  • int end_idx – represents the ending index to delete (but it does include this index before this index we can include).

Return value:

The return type of this method is StringBuilder, it returns this StringBuilder object.


// Java program to demonstrate the example 
// of StringBuilder delete(int beg_idx , int end_idx)
// method of StringBuilder 

public class Delete {
    public static void main(String[] args) {

        // Creating an StringBuilder object
        StringBuilder st_b = new StringBuilder("Java World");

        // Display before deletion
        System.out.println("st_b = " + st_b);

        // By using delete(4,10) method is to delete all the characters
        // lies in a given range from index 4 to index 10
        st_b = st_b.delete(4, 10);

        // Display st_b after deletion
        System.out.println("st_b.delete(4,10) = " + st_b);


st_b = Java World
st_b.delete(4,10) = Java


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