StringBuffer insert() in Java

06 Dec, 2018
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());    }}
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());    }}
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());    }}
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());   }      }
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());   }      }
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());   }      }
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());   }      }
string = geeks for geeks
After insertion = geeks fo10r geeks

Java-Functions
Java-lang package
java-StringBuffer
Java-Strings
Java
Java-Strings
Java
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