Answer to Question #296591 in Java | JSP | JSF for Lener

Question

Write a program to take a String as input then display the position of a particular character given as input using indexOf() function of String class. Don't use charAt() function.

Enter a String

Elephants are the largest mammals

Enter character to find: e

Index Position: 0 2 12 16 22

Answer 1

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a String");
        String line = in.nextLine();
        System.out.print("Enter character to find: ");
        String toFind = in.nextLine();
        ArrayList<Integer> indexes = new ArrayList<>();
        for (int i = 0; i < line.length(); ) {
            int index = line.toLowerCase().indexOf(toFind.toLowerCase().toCharArray()[0], i);
            if (index == -1) {
                break;
            }
            i = index + 1;
            indexes.add(index);
        }
        System.out.print("Index Position: ");
        for (Integer index : indexes) {
            System.out.print(index + " ");
        }
        System.out.println();
    }
}