Java.lang.StringBuilder.insert() Method

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Description

The java.lang.StringBuilder.insert(int offset, Object obj) method inserts the string representation of the Object argument into this sequence.
The offset argument must be greater than or equal to 0, and less than or equal to the length of this sequence.

Declaration

Following is the declaration for java.lang.StringBuilder.insert() method

public StringBuilder insert(int offset, Object obj)

Parameters

  • offset -- This is the offset.

  • obj -- This is the value of an Object.

Return Value

This method returns a reference to this object.

Exception

  • StringIndexOutOfBoundsException -- if the offset is invalid.

Example

The following example shows the usage of java.lang.StringBuilder.insert() method.

package com.tutorialspoint;

import java.lang.*;

public class StringBuilderDemo {

  public static void main(String[] args) {
  
    StringBuilder str = new StringBuilder("tutorials");
    System.out.println("string = " + str);
        
    // object to be inserted
    Object obVal = "collection";
    // insert Object value at offset 8
    str.insert(8, obVal);
        
    // prints StringBuilder after insertion
    System.out.print("After insertion = ");
    System.out.println(str.toString());
  }      
}  

Let us compile and run the above program, this will produce the following result:

string = tutorials
After insertion = tutorialcollections



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