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Thread: String Manipulations Help

  1. #1
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    Default String Manipulations Help

    I've been working at this all weekend. I'm a n00b...don't make fun.

    Obviously this works with a Tester class which is setup alright. The first object is supposed to Print only uppercase letters. I had it printing one uppercase letter and now it just returns the string. How can I print all uppercase letters? The second one is just printing the first letter. That's a far cry from printing every other letter. Anyone have any idea what I'm doing wrong on these things? I tremendously appreciate the help.

    All the best,
    Gene

     
    //******************************************
    // LetterAPI.java 
    // Written by Sanchez
    // 2013
    //*******************************************
     
    //===========================================
    // Objects of this class manipulate an inputted string.
    //===========================================
     
    import java.util.Scanner;
     
    //contains a set of methods for maniuplaing the string
    public class LetterAPI {
     
        //print only uppercase letters
        public static String bigLetters(String input) {
            String result = "";
            char cl;
            for (int i = 0; i <input.length(); i++) {
            cl=input.charAt(i);
            if (Character.isUpperCase(cl))
            input = input + cl;
            }
            return input;
     
     
    }
        //print every second letter
        public static String secondLetter(String input) {
            String result = "";
            for (int i=0; i<input.length(); i+=2) {
            input = input + input.charAt(i) + " ";
            }
            return input;
     
     
    }
         //all vowels replaced by underscores
        public static String vowelsGone(String input) {
            String vowels ="aeiouAEIOU";
            for (int i = 0; i<vowels.length();i++) {
            input=input.replace(vowels.charAt(i), '_');
            }
            return input;
     
     
    }
        //the numbers of vowels
        public static String vowelNumber(String input) {
            String result = "";
            int count = 0;
            for (int i = 0; i <input.length(); i++) {
     
                if (Character.toLowerCase(input.charAt(i)) == 'a' || Character.toLowerCase(input.charAt(i)) == 'e' || Character.toLowerCase(    input.charAt(i)) == 'i' || Character.toLowerCase(input.charAt(i)) == 'o' || Character.toLowerCase(input.charAt(i)) == 'u') {
                    count++;
                    result = count + " ";
                }
     
            }
            return result;
     
    }
        //the positions of all vowels
        public static String vowelPositions(String input) {
            String result = "";
            for (int i = 0; i <input.length(); i++) {
     
                if (Character.toLowerCase(input.charAt(i)) == 'a' || Character.toLowerCase(input.charAt(i)) == 'e' || Character.toLowerCase(input.charAt(i)) == 'i' || Character.toLowerCase(input.charAt(i)) == 'o' || Character.toLowerCase(input.charAt(i)) == 'u') {
                    result = result + i + " ";
                }
            }
            return result;
     
    }
    }


  2. #2
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    Default Re: String Manipulations Help

    In both methods you are asking for an input parameter and then you create a String result. In both methods you leave result untouched and just add to the input String passed and the return that same String.

    You are suppose to modify the result string and return the modified string to see results. Take a look at you vowelNumber() or vowelPositions() to see how they are working.

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