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); } } OutputString: 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.
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); } } OutputString: geeks for geeks After insertion: geeks fotruer geeks
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); } } OutputString: geeks for geeks After insertion: geeks foJavar geeks
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); } } OutputString: geeks for geeks After insertion: geeks fo41.35r geeks
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); } } OutputString: geeks for geeks After insertion: geeks fo41.35r geeks
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); } } OutputString: geeks for geeks After insertion: geeks fo546986r geeks
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); } } OutputString: geeks for geeks After insertion: geeks fo10r geeks
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