The StringBuffer.insert() method inserts the string representation of given data type at given position in a StringBuffer.
Syntax:
str.insert(int position, char x); str.insert(int position, boolean x); str.insert(int position, char[] x); str.insert(int position, float x); str.insert(int position, double x); str.insert(int position, long x); str.insert(int position, int x); position is the index in string where we need to insert.
Return:
This method returns a reference to this object.
Exception:
The position argument must be greater than or equal to 0, and less than or equal to the length of this string.
Boolean Input
// Java program to demonstrate StringBuffer insert// for boolean input.  import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =              new StringBuffer("geeks for geeks");        System.out.println("string = " + str);          // insert boolean value at offset 8        str.insert(8, true);          // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());    }} |
Output:
string = geeks for geeks After insertion = geeks fotruer geeks
Character Input
// Java program to demonstrate StringBuffer insert// for char input.  import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =            new StringBuffer("geeks for geeks");        System.out.println("string = " + str);          // insert boolean value at offset 8        str.insert(8, 'p');          // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());    }} |
Output:
string = geeks for geeks After insertion = geeks fopr geeks
Character Array Input
// Java program to demonstrate StringBuffer insert// for char array input.  import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =                new StringBuffer("geeks for geeks");        System.out.println("string = " + str);          // character array to be inserted        char cArr[] = { 'p', 'a', 'w', 'a', 'n' };          // insert character array at offset 9        str.insert(8, cArr);          // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());    }} |
Output:
string = geeks for geeks After insertion = geeks fopawanr geeks
Float Input
// Java program to demonstrate StringBuffer insert// for float input.import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =            new StringBuffer("geeks for geeks");        System.out.println("string = " + str);                  // insert float value at offset 3        str.insert(8, 41.35f);                  // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());   }      } |
Output:
string = geeks for geeks After insertion = geeks fo41.35r geeks
Double Input
// Java program to demonstrate StringBuffer insert// for double input.import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =            new StringBuffer("geeks for geeks");        System.out.println("string = " + str);                  // insert float value at offset 3        str.insert(8, 41.35d);                  // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());   }      } |
Output:
string = geeks for geeks After insertion = geeks fo41.35r geeks
Long Input
// Java program to demonstrate StringBuffer insert// for Long input.import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str = new StringBuffer("geeks for geeks");        System.out.println("string = " + str);                  // insert float value at offset 3        str.insert(8, 546986L);                  // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());   }      } |
Output:
string = geeks for geeks After insertion = geeks fo546986r geeks
Int Input
// Java program to demonstrate StringBuffer insert// for Int input.import java.lang.*;  public class GFG {    public static void main(String[] args)    {        StringBuffer str =             new StringBuffer("geeks for geeks");        System.out.println("string = " + str);                  // insert float value at offset 8        int x = 10;        str.insert(8, x);                  // prints stringbuffer after insertion        System.out.print("After insertion = ");        System.out.println(str.toString());   }      } |
Output:
string = geeks for geeks After insertion = geeks fo10r geeks
