Check whether s1 has the prefix/suffix AAA and assign the result to a boolean variable b

Question

Hello here is the question.

1. Check whether s1 has the prefix AAA and assign the result to a boolean variable b

2. Check whether s1 has the prefix AAA and assign the result to a boolean variable b

This is what I have so far

/**
 *
 * @author samue_000
 */
public class N95e {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String s1 = "Welcome";
        String s2 = "welcome";
        boolean b = true;
        s1.lastIndexOf("AAA");



        if (s1.lastIndexOf("AAA") == true) {

        }
        System.out.println(s1.lastIndexOf("AAA"));

    }

}

Really stuck on this and mind has gone blank. So help would be appreciated

Answer 1

boolean isStartAAA = s1.startsWith("AAA");
boolean isEndAAA = s1.endsWith("AAA");

Then print both values, you can achieve this with indexOf() as well but it unnecessary usage of the same.

Answer 2

Oh I got it now

just do boolean b = s1.startsWith("AAA);

then print

Answer 3

Or even more compact:

System.out.println(s1.startsWith("AAA")||s1.endsWith("AAA"));