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StringBuffer insert() in Java - GeeksforGeeks

StringBuffer insert() in Java

Last Updated : 05 Dec, 2024

The StringBuffer.insert() method in Java allows us to insert a string representation of a given data type at a specified position in a StringBuffer. This method is useful when we need to modify a string at specific positions without creating a new string each time by making it more efficient than concatenation.

Example: In the following example, we will insert a character into a StringBuffer at a specified position.

Java


 // Java Program to demonstrate StringBuffer 
// insert() method
import java.io.*;

class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer s = new StringBuffer("geeks for geeks");
      
        // Initial string
        System.out.println("String: " + s); 

        // Insert 'E' at position 2
        s.insert(2, 'E');
        
        // Prints StringBuffer after insertion
        System.out.println("After insertion: " + s);
    }
}

Output

String: geeks for geeks
After insertion: geEeks for geeks

Explanation: In this example, we insert the character "E" at index 2 in the StringBuffer. The original string "geeks for geeks" becomes "geEeks for geeks" after the insertion.

Syntax of StringBuffer.insert() Method

str.insert(int position, data_type value);

Parameters:

position: This is the index in string where we need to insert.
value: This is the element to be inserted at the position the data type of value can vary.

Return Type: This method returns a reference to the StringBuffer object.

Exception: The position must be greater than or equal to 0, and less than or equal to the length of the string.

Example 1: Use with Boolean Input

In this example, we insert a boolean value at a given position in the StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for boolean input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb); 
        
        // Insert boolean value at offset 8
        sb.insert(8, true);

        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks fotruer geeks

Example 2: Use with Character Array Input

In this example, we insert a character array at a given position in the StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for char array input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb); 
        
        // Character array to be inserted
        char[] ch = {'J', 'a', 'v', 'a'};
        
        // Insert character array at offset 8
        sb.insert(8, ch);

        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks foJavar geeks

Example 3: Use with Float Input

In this example, we insert a float value at a given position in the StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for float input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb); 
        
        // Insert float value at offset 8
        sb.insert(8, 41.35f);

        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks fo41.35r geeks

Example 4: Use with Double Input

In this example, we insert a double value into a StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for double input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb); 
        
        // Insert double value at offset 8
        sb.insert(8, 41.35d);
        
        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks fo41.35r geeks

Example 5: Use with Long Input

In this example, we insert a long value into a StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for Long input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb); 
        
        // Insert long value at offset 8
        sb.insert(8, 546986L);

        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks fo546986r geeks

Example 6: Use with Int Input

In this example, we insert an integer into a StringBuffer.

Java


 // Java program to demonstrate StringBuffer 
// insert() method for Int input
public class GFG {
  
    public static void main(String[] args) {
      
        StringBuffer sb = new StringBuffer("geeks for geeks");
        System.out.println("String: " + sb);
        
        // Insert int value at offset 8
        int x = 10;
        sb.insert(8, x);

        System.out.println("After insertion: " + sb);
    }
}

Output

String: geeks for geeks
After insertion: geeks fo10r geeks

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