StringBuffer insert() in Java

Last Updated : 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()); 
    } 
} 

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

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StringBuffer insert() in Java

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