StartOz.java

package Warmup01;

public class StartOz {
    public static String startOz(String str) {

        // Given a string, return a string made of the first 2 chars (if present),
        //      however include first char only if it is 'o' and
        //              include the second only if it is 'z',
        //      so "ozymandias" yields "oz".

        String result = "";
        if (str.length()>1){
            if (str.substring(0,1).equals("o")) result = "o";
            if ((!str.substring(0,1).equals("o")) && str.substring(1,2).equals("z")) result = "z";
            if (str.substring(0,1).equals("o") && str.substring(1,2).equals("z")) result = "oz";
        } else {
            result = str;
        }
        return result;
    }
//
//    BETTER SOLUTION:
//
//    public String startOz(String str) {
//        String result = "";
//
//        if (str.length() >= 1 && str.charAt(0)=='o') {
//            result = result + str.charAt(0);
//        }
//
//        if (str.length() >= 2 && str.charAt(1)=='z') {
//            result = result + str.charAt(1);
//        }
//
//        return result;
//    }

}