Im having issues using 2 different classes | Together Java | Page 1

sweet skiff Sep 20, 2023, 8:27 AM

#

Im having issues using 2 different classes, i have an assignement with a UML diagram to use 2 differnet classes

P4_2.java and CheckString.java
Im not sure how to link them together, seems like im having issues with that

sick masonBOT Sep 20, 2023, 8:27 AM

#

<@&987246399047479336> please have a look, thanks.

sick masonBOT Sep 20, 2023, 8:27 AM

#

sick mason <@&987246399047479336> please have a look, thanks.

#

While you are waiting for getting help, here are some tips to improve your experience:

Code is much easier to read if posted with syntax highlighting and proper formatting.

If nobody is calling back, that usually means that your question was not well asked and hence nobody feels confident enough answering. Try to use your time to elaborate, provide details, context, more code, examples and maybe some screenshots. With enough info, someone knows the answer for sure.

Don't forget to close your thread using the command </help-thread close:1027500463647621170> when your question has been answered, thanks.

#

Here is an AI assisted attempt to answer your question 🤖. Maybe it helps! In any case, a human is on the way 👍. To continue talking to the AI, you can use </chatgpt:1108714622413963314>.

#

ow to use them together. Can you provide more information about the assignment and the specific issues you are facing?

sweet skiff Sep 20, 2023, 8:28 AM

#

This is what ive written so far but idk how to connect them together

#


import java.util.*;

public class P4_2 {

    public static void main(String[] args) {
        CheckString aString = new CheckString("0");
        CheckString bString = new CheckString("1");
        CheckString cString = new CheckString("3");
        Scanner las = new Scanner(System.in);
        System.out.print("Skriv in tre ord");
        String a = las.nextLine();
        String b = las.nextLine();
        String c = las.nextLine();

        aString = new CheckString(a);
        bString = new CheckString(b);
        cString = new CheckString(c);

        System.out.println(aString.getString());
        System.out.println(bString.getString());
        System.out.println(aString.middle());
        System.out.println(aString.countVowels());
        System.out.println(bString.middle());
        System.out.println(bString.countVowels());

    }
}```

sick masonBOT Sep 20, 2023, 8:28 AM

#

sweet skiff ```package lab4; import java.util.*; public class P4_2 { public static vo...

Detected code, here are some useful tools:

Formatted code

package lab4;

import java.util. * ;

public class P4_2 {
  public static void main(String[] args) {
    CheckString aString = new CheckString("0");
    CheckString bString = new CheckString("1");
    CheckString cString = new CheckString("3");
    Scanner las = new Scanner(System.in);
    System.out.print("Skriv in tre ord");
    String a = las.nextLine();
    String b = las.nextLine();
    String c = las.nextLine();
    aString = new CheckString(a);
    bString = new CheckString(b);
    cString = new CheckString(c);
    System.out.println(aString.getString());
    System.out.println(bString.getString());
    System.out.println(aString.middle());
    System.out.println(aString.countVowels());
    System.out.println(bString.middle());
    System.out.println(bString.countVowels());
  }
}

sweet skiff Sep 20, 2023, 8:28 AM

#


public class CheckString {
    private String str;
    public CheckString(String str) {
        this.str = str;
    }

    public String getString() {
        return str;
    }

    public String middle() {
        if (str.length() % 2 == 0) {

            int ena = str[(str.length / 2) - 1];
            int andra = str[(str.length / 2)];
            System.out.print(ena + andra);
            // even

        } else {
            // odd
            int udda = str[(str.length / 2)];
            System.out.print(udda);
        }
    }

    public int countVowels() {

    }
}

sick masonBOT Sep 20, 2023, 8:28 AM

#

sweet skiff ```package lab4; public class CheckString { private String str; public ...

Detected code, here are some useful tools:

Formatted code

package lab4;

public class CheckString {
  private String str;
  public CheckString(String str) {
    this .str = str;
  }
  public String getString() {
    return str;
  }
  public String middle() {
    if (str.length() % 2 == 0) {
      int ena = str[(str.length / 2) - 1] ;
      int andra = str[(str.length / 2) ] ;
      System.out.print(ena + andra);
      // even
    }
    else {
      // odd
      int udda = str[(str.length / 2) ] ;
      System.out.print(udda);
    }
  }
  public int countVowels() {
  }
}

feral escarp Sep 20, 2023, 8:32 AM

#

@sweet skiff what is the problem?

sweet skiff Sep 20, 2023, 8:33 AM

#

I cant seem to connect it to my CheckString.java

feral escarp Sep 20, 2023, 8:34 AM

#

What does connect mean ?

#

And why can't you do it ?

#

Do you get an error or ?

sweet skiff Sep 20, 2023, 8:35 AM

#

When I run I get this

#

Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The type of the expression must be an array type but it resolved to String
length cannot be resolved or is not a field
The type of the expression must be an array type but it resolved to String
length cannot be resolved or is not a field
The type of the expression must be an array type but it resolved to String
length cannot be resolved or is not a field

at lab4/lab4.CheckString.middle(CheckString.java:16)
at lab4/lab4.P4_2.main(P4_2.java:23)

feral escarp Sep 20, 2023, 8:37 AM

#

Are you not using an ide ?

#

You could have red underlines with nice errors

#

@sweet skiff

#

And for this error

#

A String is not an array, you can't use [] on a String

#

And it's length(), not length

sweet skiff Sep 20, 2023, 8:40 AM

#

feral escarp And it's length(), not length

How do I do length like I did?

#

What im trying to do is find the middle letter in the word

feral escarp Sep 20, 2023, 8:42 AM

#

sweet skiff How do I do length like I did?

Wdym

#

It's length(), not length

#

You seem to mix String and arrays

#

And you can't use [] on String

#

That's for arrays

#

On String, you want to use .charAt(int) method

sweet skiff Sep 20, 2023, 8:47 AM

#

I see

#

so my assignement is to do one where it sends the 3 words you sent back

#

and then the middle letters of the words you sent

#

and then the vocals

#

#

Like this uml diagram

#

This is what iv ewritten so far

#


import java.util.*;

public class P4_2 {

    public static void main(String[] args) {
        CheckString aString = new CheckString("0");
        CheckString bString = new CheckString("1");
        CheckString cString = new CheckString("3");
        Scanner las = new Scanner(System.in);
        System.out.print("Skriv in tre ord");
        String a = las.nextLine();
        String b = las.nextLine();
        String c = las.nextLine();

        aString = new CheckString(a);
        bString = new CheckString(b);
        cString = new CheckString(c);

        System.out.println(aString.getString());
        System.out.println(aString.middle());
        System.out.println(int.countVowels());
        System.out.println(bString.getString());
        System.out.println(bString.middle());
        System.out.println(bString.countVowels());
        System.out.println(cString.getString());
        System.out.println(cString.middle());
        System.out.println(cString.countVowels());

    }
}```

sick masonBOT Sep 20, 2023, 8:58 AM

#

sweet skiff ```package lab4; import java.util.*; public class P4_2 { public static vo...

Detected code, here are some useful tools:

Formatted code

package lab4;

import java.util. * ;

public class P4_2 {
  public static void main(String[] args) {
    CheckString aString = new CheckString("0");
    CheckString bString = new CheckString("1");
    CheckString cString = new CheckString("3");
    Scanner las = new Scanner(System.in);
    System.out.print("Skriv in tre ord");
    String a = las.nextLine();
    String b = las.nextLine();
    String c = las.nextLine();
    aString = new CheckString(a);
    bString = new CheckString(b);
    cString = new CheckString(c);
    System.out.println(aString.getString());
    System.out.println(aString.middle());
    System.out.println(int .countVowels());
    System.out.println(bString.getString());
    System.out.println(bString.middle());
    System.out.println(bString.countVowels());
    System.out.println(cString.getString());
    System.out.println(cString.middle());
    System.out.println(cString.countVowels());
  }
}

sweet skiff Sep 20, 2023, 8:58 AM

#


public class CheckString {
    private String str;

    public CheckString(String str) {
        this.str = str;
    }

    public String getString() {
        return str;
    }

    public String middle() {
        if (str.length() % 2 == 0) {

            int ena = (str.length() / 2) - 1;
            int andra = str.length() / 2;
            // even

        } else {
            // odd
            int udda = str.length() / 2;
            System.out.print(udda);
        }
        return str;
    }
int vokal = 0;
    public int countVowels() {
         for (int i = 0; i < str.length(); i++) {
            vokal = i + vokal;    
        if(str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || 
                str.charAt(i) == 'ö' || str.charAt(i) == 'å' || str.charAt(i) == 'u'  || str.charAt(i) == 'ä'); {
                    
                    System.out.println("\n" + vokal);
            
                
                    
        }
                
        }

    }
}

sick masonBOT Sep 20, 2023, 8:58 AM

#

sweet skiff ```package lab4; public class CheckString { private String str; public...

Detected code, here are some useful tools:

Formatted code

package lab4;

public class CheckString {
  private String str;
  public CheckString(String str) {
    this .str = str;
  }
  public String getString() {
    return str;
  }
  public String middle() {
    if (str.length() % 2 == 0) {
      int ena = (str.length() / 2) - 1;
      int andra = str.length() / 2;
      // even
    }
    else {
      // odd
      int udda = str.length() / 2;
      System.out.print(udda);
    }
    return str;
  }
  int vokal = 0;
  public int countVowels() {
    for (int i = 0; i < str.length(); i++) {
      vokal = i + vokal;
      if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'ö' || str.charAt(i) == 'å' || str.charAt(i) == 'u' || str.charAt(i) == 'ä');
        {
        System.out.println("\n" + vokal);
      }
    }
  }
}

sweet skiff Sep 20, 2023, 8:59 AM

#

for some reason im still getting issues even tho it seems correct

feral escarp Sep 20, 2023, 9:01 AM

#

sweet skiff ```package lab4; public class CheckString { private String str; public...

Why is vokal declared outside the method ? It should be inside

#

And please add variables

#

Instead of calling charAt several times, call it once

#

And countVowels doesn't return anything that's not normal

sweet skiff Sep 20, 2023, 9:03 AM

#

if(str.charAt(i) == 'a' || 'e' || 'i' || 'o' ||

#

doesnt like this doesnt work tho

#

if(str.charAt(i) == 'a' || 'e' || 'i' || 'o' ||

sweet skiff Sep 20, 2023, 9:21 AM

#

also

#

        if (str.length() % 2 == 0) {

            int forsta = (str.length() / 2) - 1;
             int andra = str.length() / 2;
             str = forsta + andra;
             String bada = forsta + andra;
            return bada;
            // even

        } else {
            // odd
            int udda = str.length() / 2;
            return udda;
        }
    }```

sick masonBOT Sep 20, 2023, 9:22 AM

#

sweet skiff ```public String middle() { if (str.length() % 2 == 0) { in...

Detected code, here are some useful tools:

Formatted code

public String middle() {
  if (str.length() % 2 == 0) {
    int forsta = (str.length() / 2) - 1;
    int andra = str.length() / 2;
    str = forsta + andra;
    String bada = forsta + andra;
    return bada;
    // even
  }
  else {
    // odd
    int udda = str.length() / 2;
    return udda;
  }
}

sweet skiff Sep 20, 2023, 9:22 AM

#

this doesnt work

#

if my input is Hejsan
Hejsan
baloo

I get the output

#

2baloo
farjee
farjee

#

when im supposed to get
l
rj
rj

#

Right now in the code i have some missmathces tho aparrently

feral escarp Sep 20, 2023, 9:29 AM

#

sweet skiff ```if(str.charAt(i) == 'a' || 'e' || 'i' || 'o' ||```

No, keep your previous code

feral escarp Sep 20, 2023, 9:29 AM

#

sweet skiff ```public String middle() { if (str.length() % 2 == 0) { in...

You can't return an int when it except a string

sweet skiff Sep 20, 2023, 9:32 AM

#

feral escarp You can't return an int when it except a string

So how can I do it

#

To return with the numbers inside

sweet skiff Sep 20, 2023, 10:01 AM

#

figured that out

sick masonBOT Sep 20, 2023, 10:05 AM

#

At the end of the code snippet, there seems to be a syntax error. The code is incomplete and missing the closing parenthesis and semicolon. Here's the corrected version:

public int countVowels() {
    int vokal = 0;
    for (int i = 0; i < str.length(); i++) {
        if(str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'u') {
            vokal++;
        }
    }
    return vokal;
}

This code counts the number of vowels in a given string str. It initializes a variable vokal to 0 and then iterates over each character in the string. If the character is a vowel (either 'a', 'e', 'i', 'o', or 'u'), it increments vokal by 1. Finally, it returns the total count of vowels found in the string.

sweet skiff Sep 20, 2023, 10:05 AM

#

i want it to show all vocales

sick masonBOT Sep 20, 2023, 10:06 AM

#

Sure! Here are all the vowels: a, e, i, o, u.

civic wyvern Sep 20, 2023, 10:32 AM

#

sweet skiff i want it to show all vocales

Is problem solved?

sweet skiff Sep 20, 2023, 10:32 AM

#

civic wyvern Is problem solved?

No

#

    public int countVowels() {
         for (int i = 0; i < str.length(); i++) {
             int vokal = 0;
             vokal = i + vokal;    
        if(str.charAt(i) == 'a' ||
                str.charAt(i) ==  'e'||
                str.charAt(i) == 'i' ||
                str.charAt(i) == 'o' || 
                str.charAt(i) == 'ö' ||
                str.charAt(i) == 'å' || 
                str.charAt(i) == 'a' || 
                str.charAt(i) == 'u' ||
                str.charAt(i) == 'ä'); {
                    
                    
            
                
                    return vokal;
                    
    }
         }
    }
}```

sick masonBOT Sep 20, 2023, 10:33 AM

#

sweet skiff ``` public int countVowels() { for (int i = 0; i < str.length(); i+...

Detected code, here are some useful tools:

Formatted code

public int countVowels() {
  for (int i = 0; i < str.length(); i++) {
    int vokal = 0;
    vokal = i + vokal;
    if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'ö' || str.charAt(i) == 'å' || str.charAt(i) == 'a' || str.charAt(i) == 'u' || str.charAt(i) == 'ä');
      {
      return vokal;
    }
  }
}
}

sweet skiff Sep 20, 2023, 10:33 AM

#

This is what ive written so far

civic wyvern Sep 20, 2023, 10:33 AM

#

What you want to achieve?

sweet skiff Sep 20, 2023, 10:33 AM

#

To write all the vocales in a word

civic wyvern Sep 20, 2023, 10:34 AM

#

sweet skiff To write all the vocales in a word

If you want a word.. i consider word as strong, so first of all, why returning a int?

sweet skiff Sep 20, 2023, 10:34 AM

#

civic wyvern If you want a word.. i consider word as strong, so first of all, why returning a...

i tried returning str

#

didnt work

civic wyvern Sep 20, 2023, 10:39 AM

#

Ok, so let's say your returning a string, so first you want to store it in a string,....
So, let's say initial string = ''
...empty

Then if you get a vowel while interacting, you need to add that into strong, not return...

When finish iterating whole input, u can return the value

sweet skiff Sep 20, 2023, 10:40 AM

#

I did vokal+i = vokal

#

to get all the vokals

#

together'

#

civic wyvern Sep 20, 2023, 10:42 AM

#

Vokal is int, don't you think, make it a string first?

sweet skiff Sep 20, 2023, 10:42 AM

#

i get this error otherwise

#

#

still doesnt work'

civic wyvern Sep 20, 2023, 10:43 AM

#

Because u need to do some more changes which are basic to java

#

see vocal is not initialised, first initialize it to empty string

#

Strong vocal = "";

#

Like that

#

And we want to vowels from whole input, right? So put vocal above for liip

#

Loop*

sweet skiff Sep 20, 2023, 10:45 AM

#

#

like this?

civic wyvern Sep 20, 2023, 10:46 AM

#

Yes, now why there is ; after if condition? There should not be any

#

Because it breaks there, not going inside the if

sweet skiff Sep 20, 2023, 10:47 AM

#

ah

#

civic wyvern Sep 20, 2023, 10:48 AM

#

Now let's say if a character is vowel, it does not need to return vocal.... it need to add char to vocal...
So inside if

vocal = vocal + str.charAt(i);

#

Right ??

sweet skiff Sep 20, 2023, 10:49 AM

#

right but wouldnt it be the same thing

#

because i = str.charAt(i)

civic wyvern Sep 20, 2023, 10:49 AM

#

Actually what u doing is, if I get a vowel return the ans, but I need to check the remaining indexes of i after current, so can't return without checking others

civic wyvern Sep 20, 2023, 10:50 AM

#

sweet skiff because i = str.charAt(i)

i is index pointed to a memory, but str.charAt(i) gives you the character

#

At that memory

sweet skiff Sep 20, 2023, 10:51 AM

#

civic wyvern At that memory

ah

#

am I not supposed to be returning smth with str?

#

thats what i did with the previous assignements

#

#

(this is to get the middle letter)

karmic island Sep 20, 2023, 10:52 AM

#

sweet skiff am I not supposed to be returning smth with str?

https://i.imgur.com/xUFQFyc.png

Imgur

#

int

#

its supposed to return the count

#

a number

#

for example 5 for "i found 5 vocals"

sweet skiff Sep 20, 2023, 10:53 AM

#

ah

#

wait hold up

#

maybe i misunderstood the assignement

#

ill send u what it says

civic wyvern Sep 20, 2023, 10:54 AM

#

What is str, input right?? So we need input to come with func calling

#

So pass str inside countVowels function

#

I am on a subway lol, when it goes underground, network lost cat_thumbs_up

civic wyvern Sep 20, 2023, 10:54 AM

#

sweet skiff To write all the vocales in a word

@karmic island his problem is this i guess

civic wyvern Sep 20, 2023, 10:54 AM

#

sweet skiff maybe i misunderstood the assignement

Hmmm peepo_sad

sweet skiff Sep 20, 2023, 10:55 AM

#

this is the uml diagram

#

ive done everything except for the last part

#

it says its supposed to be int

#

The countVwels() method counts the number of vowels in the stored string and returns the value.
As in the previous task, you need to create another class that creates and tests the functionality that
CheckString has

#

maybe you are right

#

maybe its supposed to be just the amount

civic wyvern Sep 20, 2023, 10:57 AM

#

It only needs to count, you told above to write ....

sweet skiff Sep 20, 2023, 10:57 AM

#

i thought i needed to write

#

im so sorry

civic wyvern Sep 20, 2023, 10:58 AM

#

No, I don't mean that, I mean u need to revert changes I made u do

sweet skiff Sep 20, 2023, 10:58 AM

#

#

here?

civic wyvern Sep 20, 2023, 10:59 AM

#

sweet skiff

This

#

So let's start again, return is int, so let's count the vowels

#

First before for loop, like before checking string, we have 0 count of vowels
So initialize
->. int count = 0;

#

Then inside for loop, let's i = 0, first and then checking if Char is vowel, inside if, we can increase count by 1, cause we got one more vowel..

So
count = count +1;

#

After for loop, return count which has count of all vowels in str..

return count;

sweet skiff Sep 20, 2023, 11:03 AM

#

#

like this?

civic wyvern Sep 20, 2023, 11:03 AM

#

Read it again

civic wyvern Sep 20, 2023, 11:04 AM

#

civic wyvern First before for loop, like before checking string, we have 0 count of vowels So...

Before for loop, i state

civic wyvern Sep 20, 2023, 11:04 AM

#

civic wyvern Then inside for loop, let's i = 0, first and then checking if Char is vowel, ins...

Inside for loop

civic wyvern Sep 20, 2023, 11:04 AM

#

civic wyvern After for loop, return count which has count of all vowels in str.. return cou...

After for loop

sweet skiff Sep 20, 2023, 11:04 AM

#

oh like this?

civic wyvern Sep 20, 2023, 11:05 AM

#

Right, now read what I said for inside for-loop

sweet skiff Sep 20, 2023, 11:07 AM

#

isnt it what im doing tho

#

checks if its vowel

#

if then i++

feral escarp Sep 20, 2023, 11:15 AM

#

sick mason At the end of the code snippet, there seems to be a syntax error. The code is in...

Now replace all the charAt by a variable

civic wyvern Sep 20, 2023, 11:18 AM

#

sick mason At the end of the code snippet, there seems to be a syntax error. The code is in...

Bot already given you outcome @sweet skiff

sweet skiff Sep 20, 2023, 11:21 AM

#

        int vokal = 0;

        for (int i = 0; i < str.length(); i++) {

            if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o'
                    || str.charAt(i) == 'ö' || str.charAt(i) == 'å' || str.charAt(i) == 'a' || str.charAt(i) == 'u'
                    || str.charAt(i) == 'ä')
                ;
            {
                vokal++;

            }
        }
        return vokal;```

sick masonBOT Sep 20, 2023, 11:21 AM

#

sweet skiff ```public int countVowels() { int vokal = 0; for (int i = 0; i ...

Detected code, here are some useful tools:

Formatted code

public int countVowels() {
  int vokal = 0;
  for (int i = 0; i < str.length(); i++) {
    if (str.charAt(i) == 'a' || str.charAt(i) == 'e' || str.charAt(i) == 'i' || str.charAt(i) == 'o' || str.charAt(i) == 'ö' || str.charAt(i) == 'å' || str.charAt(i) == 'a' || str.charAt(i) == 'u' || str.charAt(i) == 'ä');
      {
      vokal++;
    }
  }
  return vokal;

sweet skiff Sep 20, 2023, 11:21 AM

#

this is what ive done and it gives me the amount of numbers in the word now

#

like for instance if i give it

ABB

Its gonna give me 3

#

oh

#

i think i solved it, i think it was what u told me before

#

the ; in the if

#

Yes that was it

#

thank you so much its all solved

civic wyvern Sep 20, 2023, 11:22 AM

#

Hmm great

sweet skiff Sep 20, 2023, 11:23 AM

#

Apologies for being a mess

#

just started coding, seems exciting tho! 😄

civic wyvern Sep 20, 2023, 11:23 AM

#

My subway journey ends here

#

Just got to the last station hue

sweet skiff Sep 20, 2023, 11:28 AM

#

civic wyvern Just got to the last station <:hue:662398199381884954>

🤣

#Im having issues using 2 different classes