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Following program shows you how to find the index of a particular character in a given string.

import java.util.Scanner;

public class StringOperations9 {

    public static void main(String[] args) {

        String input;

        Scanner in = new Scanner(System.in);

        System.out.println("Please enter a string:");

        input = in.nextLine();

        System.out.println("Please enter a character:");

        String character = in.nextLine();

        System.out.println("Index of given character is: " + input.indexOf(character));
    }
}

Output:

Example1:

Please enter a string:
hello
Please enter a character:
o
Index of given character is: 4

Example2:

Please enter a string:
hello
Please enter a character:
r
Index of given character is: -1



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