java.lang.StringBuffer class comes with many helper methods to manipulate string. One of the methods is overloaded lastsIndexOf() method used to search for the last occurrence of a stirng in the buffer.
What Java API says abou lastIndexOf() StringBuffer:
- public int lastsIndexOf(String searchString): Returns an int value of the last occurrence of the index number 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 the nearest occurrence of searchString in the buffer where search starts from searchIndex. Returns -1 if the searchString is not found.
Example on lastIndexOf() StringBuffer uses both overloaded methods
public class Demo
{
public static void main(String args[])
{ // hello comes in 3 places
StringBuffer sb1 = new StringBuffer("123hello456hello789hello");
// to find last occurrence of hello
int x = sb1.lastIndexOf("hello");
System.out.println("Last Occurrence of hello: " + x);
// to find last occurrence of hello starting from 9th index number
x = sb1.lastIndexOf("hello", 9);
System.out.println("Occurrence of hello from index 9: " + x);
x = sb1.lastIndexOf("world"); // world does not exist
System.out.println("Occurrence of world which does not exist: " + x);
}
}
}
Output screenshot on lastIndexOf() StringBuffer
Also know the usage of overloaded IndexOf() method which checks the starting index in the string.
