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

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What is abstract class or abstract method?

We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();

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

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