Programming Forums > Application Development > Java

ReggaetonKing · Apr 21st, 2006, 12:57 AM

Hey, I am making this program where it has to compare a character form a word to another character. This is my code so far. I keep getting error messages saying "Cannot invoke .equals on the primitive type char"
[PHP]
public static int compareChar(char a, String word)
{
for(int c = 0; c < word.length(); c++)
{
if(word.charAt(c).equals(a))
return c;
}
return -1;
}
[/PHP]
Can someone help me out? I even tried doing this
[PHP]
public static int compareChar(char a, String word)
{
for(int c = 0; c < word.length(); c++)
{
char x = word.charAt(c)
if(x.equals(a))
return c;
}
return -1;
}
[/PHP]
Should I try just comparing them using the compareTo method instead of check for equality?

The Dark · Apr 21st, 2006, 1:27 AM

How about just using ==

ReggaetonKing · Apr 21st, 2006, 1:54 AM

doesn't that just compare if the characters are part of the same object?

Jimbo · Apr 21st, 2006, 2:11 AM

for primitive types (int, char, double, ...) == compares the value. For anything that extends Object (meaning anything else), == compares the memory location.

ReggaetonKing · Apr 21st, 2006, 2:45 AM

I shouldn't have over-looked the power of characters in ANY language,

thanks!

nnxion · Apr 21st, 2006, 2:48 AM

Maybe I'm stupid, but aren't you trying to do the same as indexOf()?

ReggaetonKing · Apr 21st, 2006, 8:25 AM

omg nnxion, I completely forgot about that string method! That's a big help, thanks man! lol

crawforddavid2006 · Apr 22nd, 2006, 3:11 PM

Are you using the comparable interface? if not then do this

(Toggle Plain Text)

public class test implements Comparable
{
//whatever you need to put here
// a.k.a your code
}

ReggaetonKing · Apr 22nd, 2006, 3:36 PM

I've never heard of that interface. I will look up the methods online. Sounds and Looks promising.

Jimbo · Apr 22nd, 2006, 5:07 PM

Comparable is fine for classes, but still won't work for primitives...

Apr 21st, 2006, 12:57 AM	#1
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	Comparing characters from words Hey, I am making this program where it has to compare a character form a word to another character. This is my code so far. I keep getting error messages saying "Cannot invoke .equals on the primitive type char" [PHP] public static int compareChar(char a, String word) { for(int c = 0; c < word.length(); c++) { if(word.charAt(c).equals(a)) return c; } return -1; } [/PHP] Can someone help me out? I even tried doing this [PHP] public static int compareChar(char a, String word) { for(int c = 0; c < word.length(); c++) { char x = word.charAt(c) if(x.equals(a)) return c; } return -1; } [/PHP] Should I try just comparing them using the compareTo method instead of check for equality? __________________ I would love to change the world, but they won't give me the source code!

Apr 21st, 2006, 1:54 AM	#3
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	doesn't that just compare if the characters are part of the same object? __________________ I would love to change the world, but they won't give me the source code!

Apr 21st, 2006, 2:45 AM	#5
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	I shouldn't have over-looked the power of characters in ANY language, thanks! __________________ I would love to change the world, but they won't give me the source code!

Apr 21st, 2006, 2:48 AM	#6
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	Maybe I'm stupid, but aren't you trying to do the same as indexOf()? __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Apr 21st, 2006, 8:25 AM	#7
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	omg nnxion, I completely forgot about that string method! That's a big help, thanks man! lol __________________ I would love to change the world, but they won't give me the source code!

Apr 21st, 2006, 1:27 AM	#2
The Dark Expert Programmer Join Date: Jun 2005 Posts: 852 Rep Power: 4	How about just using ==

Apr 21st, 2006, 2:11 AM	#4
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 763 Rep Power: 3	for primitive types (int, char, double, ...) == compares the value. For anything that extends Object (meaning anything else), == compares the memory location.

Apr 22nd, 2006, 3:36 PM	#9
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	I've never heard of that interface. I will look up the methods online. Sounds and Looks promising. __________________ I would love to change the world, but they won't give me the source code!

Apr 22nd, 2006, 5:07 PM	#10
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 763 Rep Power: 3	Comparable is fine for classes, but still won't work for primitives...

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Programming Forums > Application Development > Java

Comparing characters from words