Java Community | Help. Code. Learn.•2d ago

Output Characters

Currently confused as to why there are actual "character" blocks being printed out with my String input result.

public static void main() {
    String turtles = convertToWhale("Normal Classes and Turtles be Turtling");
    String tower = convertToWhale("Tower of Terror");
    System.out.println(turtles);
    System.out.println(tower);
}

private static String convertToWhale(String phrase) {
    char[] newArray = new char[phrase.length()];
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    int i = 0;
    for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                newArray[i++] = c;
                newArray[i++] = vowel;
            }
        }
    }
    return new String(newArray).toUpperCase();
}

public static void main() {
    String turtles = convertToWhale("Normal Classes and Turtles be Turtling");
    String tower = convertToWhale("Tower of Terror");
    System.out.println(turtles);
    System.out.println(tower);
}

private static String convertToWhale(String phrase) {
    char[] newArray = new char[phrase.length()];
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    int i = 0;
    for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                newArray[i++] = c;
                newArray[i++] = vowel;
            }
        }
    }
    return new String(newArray).toUpperCase();
}

Please see screenshot for terminal log!

30 Replies

JavaBot•2d ago

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0x150•2d ago

the char array is bigger than the data you write to it, and thus the string you return contains characters that haven't been filled (\u0000) cmd displays these as the "missing character" symbol you see there

JavaBot•2d ago

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Jordan σ_σOP•23h ago

hmm i see i wonder if i need to change phrase.length() that is passed into the char array to a specified length

ayylmao123xdd•23h ago

i guess if you wanna do the exact char size as the desired string length you could count the amount of vowels in the string and then do

new char[amountOfVowels * 2]

new char[amountOfVowels * 2]

but thats an extra loop

Jordan σ_σOP•23h ago

yeahhhh we wouldnt wanna do an extra loop here in this case

ayylmao123xdd•23h ago

but then you dont know the array size you need to declare

Jordan σ_σOP•23h ago

im missing something...a key factor here about how the array size is not catching on to the size of the string thats passed through within the char array. and this is why folks debugging is key XD

ayylmao123xdd•23h ago

wait

          newArray[i++] = c;
                newArray[i++] = vowel;

          newArray[i++] = c;
                newArray[i++] = vowel;

cant you just use

          newArray[i++] = vowel;
                newArray[i++] = vowel;

          newArray[i++] = vowel;
                newArray[i++] = vowel;

why swap two values i mean use two values

Jordan σ_σOP•23h ago

i mean you're right i could do that instead because the first one just outputs the entire length with those missing characters hmm lemme try that actually

ayylmao123xdd•23h ago

yea check maybe its gonna work properly also do you need to use an array instead of stringbuilder @0x150 do you know any way you can count the amount of vowels without an extra loop so the array size is properly initialized

Jordan σ_σOP•22h ago

Can we change the size of it within the loop? is that possible?

ayylmao123xdd•22h ago

i dont think so you would need to use stringbuilder its faster than string

Jordan σ_σOP•22h ago

Indeed this is correct and it has been resolved cant believe i was overlooking StringBuilder...i didnt have it as my first choice right but I definitely was thinking about it but kept overlooking it and kept thinking that it wouldnt work but after understanding that i could just pass in phrase.length() inside the StringBuilder constructor...because i didnt know it could take in an actual memory size...your conclusion worked out just fine and i appreciate that check it out

public static void main() {
    String turtles = convertToWhale("Normal Classes and Turtles be Turtling");
    String tower = convertToWhale("Tower of Terror");
    System.out.println(turtles);
    System.out.println(tower);
}

private static String convertToWhale(String phrase) {
    StringBuilder builder = new StringBuilder(phrase.length());
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                builder.append(vowel).append(vowel);
            }
        }
    }
    return builder.toString().toUpperCase();
}

public static void main() {
    String turtles = convertToWhale("Normal Classes and Turtles be Turtling");
    String tower = convertToWhale("Tower of Terror");
    System.out.println(turtles);
    System.out.println(tower);
}

private static String convertToWhale(String phrase) {
    StringBuilder builder = new StringBuilder(phrase.length());
    char[] vowels = {'a', 'e', 'i', 'o', 'u'};
    for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                builder.append(vowel).append(vowel);
            }
        }
    }
    return builder.toString().toUpperCase();
}

Jordan σ_σOP•22h ago

cool shit

ayylmao123xdd•22h ago

https://tenor.com/view/roblox-script-i-just-write-thousand-line-of-codes-without-a-single-error-coding-hello-world-gif-13384672663063020392

Tenor

Jordan σ_σOP•22h ago

truth be told

ayylmao123xdd•22h ago

you could also use a list for the vowels and instead of looping over all the vowels just use

if (vowels.constains(vowel) {}

if (vowels.constains(vowel) {}

thats 1 loop less

Jordan σ_σOP•22h ago

by improving the speed of it we would use a List ye? the more loops we can remove the faster the code would be correct?

ayylmao123xdd•22h ago

yea the time complexity is lowered

Jordan σ_σOP•22h ago

Different topic but how do we calculate time complexity in our code? Is there a way we could do this locally to test our code to see how long each method would take?

ayylmao123xdd•22h ago

if u wanna measure the time a method takes to finish u can do something like now

Instant now = Instant.now();

// ur method

ChronoUnit.MILLIS.between(now, Instant.now())

Instant now = Instant.now();

// ur method

ChronoUnit.MILLIS.between(now, Instant.now())

and about time complexity

ayylmao123xdd•22h ago

https://www.geeksforgeeks.org/understanding-time-complexity-simple-examples/

GeeksforGeeks

Understanding Time Complexity with Simple Examples - GeeksforGeeks

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

ayylmao123xdd•22h ago

https://www.baeldung.com/java-collections-complexity

Baeldung

Time Complexity of Java Collections | Baeldung

Learn about the time complexity for common operations on Java collections

ayylmao123xdd•22h ago

cuz idk how to explain it simply

Jordan σ_σOP•22h ago

I appreciate this much

ayylmao123xdd•22h ago

one more thing .contains also runs a loop on the vowels if it was a list but it stops once it finds that element and if it doesnt it runs till the end so in your example to have the same functionality with a loop it would be

 for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                builder.append(vowel).append(vowel);
                break;
            }
        }
    }

 for (char c : phrase.toCharArray()) {
        for (char vowel : vowels) {
            if (c == vowel) {
                builder.append(vowel).append(vowel);
                break;
            }
        }
    }

not 100 percent sure about this though additionally to have the searching even faster in the vowels you could use a set because the time complexity to find it will be o(1) instead of o(n) so faster but you can read about it more

Jordan σ_σOP•22h ago

i appreciate this much if i could give a 5 star rating for customer service/assistance i would give it to you @0x150

JavaBot•17h ago

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