Question

Write a static method startsWith that inputs two Strings and returns a boolean. If the first input starts with the substring that is the second input, then the method returns true; otherwise, it returns false.

For example,

startsWith( "radar installation", "rad" )	returns	true
startsWith( "radar installation", "installation" )	returns	false
startsWith( "radar installation", "" )	returns	true
startsWith( "", "a" )	returns	false
startsWith( "", "" )	returns	true

Answer 1

public static boolean startsWith(String s1, String s2) {
    if (s2.length() <= s1.length()) {
        for (int i = 0; i < s2.length(); i++) {
            if (s1.charAt(i) != s2.charAt(i)) {
                return false;
            }
        }
        return true;
    }
    return false;
}

public class StartsWith {

    public static boolean startsWith(String s1, String s2) {
        if (s2.length() <= s1.length()) {
            for (int i = 0; i < s2.length(); i++) {
                if (s1.charAt(i) != s2.charAt(i)) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    public static void main(String[] args) {
        System.out.println(startsWith("radar installation", "rad"));
        System.out.println(startsWith("radar installation", "installation"));
        System.out.println(startsWith("radar installation", ""));
        System.out.println(startsWith("", "a"));
        System.out.println(startsWith("", ""));
    }
}