indexOf() StringBuffer Example

java.lang.StringBuffer class comes with many helper methods to manipulate string. One of the methods is overloaded indexOf() method used to search for the first occurrence of a string in the buffer.

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Let us see what Java API says about indexOf() StringBuffer:

• public int indexOf(String searchString): Returns an int value of the index number of first occurrence of searchString in the buffer. Returns -1 if the searchString is not found.
• public synchronized int indexOf(String searchString, int searchIndex): Returns an int value of the index number of first occurrence of searchString in the buffer where search starts from searchIndex. Returns -1 if the searchString is not found.

Following indexOf() StringBuffer example illustrates the usage of two overloaded method in all possible ways.

public class Demo
{
  public static void main(String args[])
  {				            // hello comes in 3 places	
   StringBuffer sb1 = new StringBuffer("123hello456hello789hello");    
                                            // to find 1st occurrence of hello
   int x = sb1.indexOf("hello");   
   System.out.println("First Occurrence of hello: " + x);

                                            // to find first occurrence of hello starting from 9th index number
   x = sb1.indexOf("hello", 9);   
   System.out.println("Occurrence of hello from index 9: " + x);

   x = sb1.indexOf("world");   	            // world does not exist
   System.out.println("Occurrence of world which does not exist: " + x);
 }
}

Output screenshot on indexOf() StringBuffer example

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