Java First Repeated Character In String

            /* ............... START ............... */
                
import java.util.Scanner;

public class JavaFirstRepeatedCharacter {

	Scanner in = new Scanner(System.in);

	public static void main(String[] args) {
		JavaFirstRepeatedCharacter frc = new JavaFirstRepeatedCharacter();
		frc.mainLoop();
	}

	void mainLoop() {
		String str = " ";
		System.out.println("Please enter a string: ");
		str = in.next();
		str = str.toLowerCase();
		for (int i = 0; i < str.length(); i++) {
			char character = str.charAt(i);
			int firstIndex = str.indexOf(character);
			int lastIndex = str.lastIndexOf(character);
			if (firstIndex != lastIndex) {
				System.out.println("The character '" + character + "' is repeated");
				break;
			}
		}
	}
}

                /* ............... END ............... */