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Java StringBuffer int length() method with Example

Java StringBuffer insert(int offset , String s) method: Here, we are going to learn about the insert(int offset , String s) method of StringBuffer class with its syntax and example.
Submitted by Preeti Jain, on June 29, 2019

StringBuffer Class insert(int offset , String s)

• This method is available in package java.lang.StringBuffer.insert(int offset, String s).
• This method is used to insert the string representation with the given object at the specified position.
• This method is overridable so it is available in different-2 forms like:
  • StringBuffer insert(int offset , boolean b)
  • StringBuffer insert(int offset , char c)
  • StringBuffer insert(int offset , char[] c) etc

Syntax:

    StringBuffer insert(int offset , String s){
    }

Parameter(s):

We can pass two or three objects according to our need as a parameter in the method and that object will insert in a sequence at the specified position.

Return value:

The return type of this method is StringBuffer that means this method returns a reference to this object.

Java program to demonstrate example of insert() method

import java.lang.StringBuffer;

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

        StringBuffer sb = new StringBuffer("Java is a programming language : ");

        // use insert(int offset ,Boolean b) it will insert the Boolean parameter 
        // at index 33 as string to the StringBuffer

        sb.insert(33, true);

        // Display result after inserting

        System.out.println("The result will be after inserting Boolean object to the StringBuffer is :" + sb.toString());

        sb = new StringBuffer("Version of Java is : ");

        // use insert(int offset , int i) it will insert the Integer parameter  
        // at index 21 as string to the StringBuffer

        sb.insert(21, 8);

        // Display result after inserting
        System.out.println("The result will be after inserting Integer object to the StringBuffer is :" + sb.toString());
    }
}

Output

D:\Programs>javac StringBufferClass.java

D:\Programs>java StringBufferClass
The result will be after inserting Boolean object to the StringBuffer is :Java is a programming language : true
The result will be after inserting Integer object to the StringBuffer is :Version of Java is : 8