JAVA: String char removal with nested loop

[igniteflow]

I'm trying to make a nested loop which will search for and remove chars from a string. The keyword contains six letters, alphabet of course is 26. Can anyone show me what I'm doing wrong? The second loop works fine to remove one char, but I need it to remove all six, so that only the letters of the alphabet remain that are not in the keyword.

for (int j = 0; j < keyword.length(); j++)
        letter = keyword.charAt(j);
         for (int i = 0; i < alphabet.length(); i ++)
            if (alphabet.charAt(i) != letter) r += alphabet.charAt(i);

[CJSLMAN]

• Well... the first thing that stands out is a total lack of curly brackets "{}". Even if you have a one-liner after a "for" or "if", it's good to use them... you avoid headaches later on.

for (int j = 0; j < keyword.length(); j++)
    [COLOR="Red"]{[/COLOR]
        letter = keyword.charAt(j);
         for (int i = 0; i < alphabet.length(); i ++)
             [COLOR="red"]{[/COLOR] 
               if (alphabet.charAt(i) != letter) 
                [COLOR="red"]{[/COLOR]
                  r += alphabet.charAt(i);
                [COLOR="red"]}[/COLOR]
             [COLOR="red"]}[/COLOR]
    [COLOR="red"]}[/COLOR]

• Next, you're comparing strings using equality operators (==, !=). Since you're comparing strings it's better to use the String class methods like .equals() or .compareTo():

String (Java Platform SE 6)

Luck,
CJSL

[igniteflow]

Thanks, that's useful. Sorry I forgot to mention that "letter" is a char so I can't use the String API methods, I think.

[CJSLMAN]

You are correct, you're comparing chars. It would probably be better if you posted all your code.
For example:

• What type/object is variable r?

CJSL