JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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How to get index of a character or string from another String in java?


Description:

Below method shows how to get index of a specified character or string from the given string. By using indexOf() method you get get the position of the sepcified string or char from the given string. You can also get the index strting from a specified position of the string.


Code:
package com.myjava.string;

public class MyStringIndexOf {

    public static void main(String[] a){
    
        String str = "Use this string for testing this";
        System.out.println("Basic indexOf() example");
        System.out.println("Char 's' at first occurance: "+str.indexOf('s'));
        System.out.println("String \"this\" at first occurance: "+str.indexOf("this"));
        /**
         * Returns the first occurance from specified start index
         */
        System.out.println("First occurance of char 's' from 4th index onwards : "
							+str.indexOf('s',4));
        System.out.println("First occurance of String \"this\" from 6th index onwards: "
							+str.indexOf("this",6));
        
    }
}

Example Output

Basic indexOf() example
Char 's' at first occurance: 1
String "this" at first occurance: 4
First occurance of char 's' from 4th index onwards : 7
First occurance of String "this" from 6th index onwards: 28

Other String Function Examples

Knowledge Centre
Difference between Enumeration and Iterator
The functionality of Enumeration and the Iterator are same. You can get remove() from Iterator to remove an element, while while Enumeration does not have remove() method. Using Enumeration you can only traverse and fetch the objects, where as using Iterator we can also add and remove the objects. So Iterator can be useful if you want to manipulate the list and Enumeration is for read-only access.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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