anyone can solve the problem with userInput.indexOf() without replaceing it with userInput.contains?

import java.util.Scanner;

public class CensoredWords { public static void main (String [] args) { String userInput = "";

userInput = "That darn cat."; String userInput = "darn"; if (userInput.indexOf()) { System.out.println("Censored"); } else { System.out.println("userInput"); }

return; } }