Can anyone explain why I can't do this? (Java) - Overclock.net

Bviper · 09-26-09

Code:

while(choice !=("T"||"F"))
	{
	        System.out.println("This program can only be run with a file to copy. Would you like to continue?");
		System.out.println("Enter T to continue, or F to exit the program.");
		choice = userDecision.next();
	}

What I get from the compiler:

Prog1.java:20: operator || cannot be applied to java.lang.String,java.lang.String while(choice !=("T"||"F"))

I mean it makes sense to me... while this string literally does not equal T or F, then continue to try and get it to.

Bviper · 09-26-09

Code:

 while((choice.equalsIgnoreCase("T") || choice.equalsIgnoreCase("F"))== false)
	{
		System.out.println("This program can only be run with a file to copy. Would you like to continue?");
		System.out.println("Enter T to continue, or F to exit the program."); choice = userDecision.next();
	}

Well, that's what I ended up going with. It's better because it ignores case, but I still would like to know if there's any more compact method.

hybrid-kernel · 09-26-09

can't do choice !=("T"||"F") because you can't compare strings with basic operators, ("T"||"F") cannot be evaluated as a boolean and unless choice is boolean, you can't compare it to one.

you'd probably have better luck with chars. don't know what approach to use though.

Pooping^fish · 09-27-09

Javas funny, and I dont know of anything better than what youve implemented.
Ill let you know though that chars are generally referenced using single quotes.
Such as:

Code:

blah[x] = 'x';

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Can anyone explain why I can't do this? (Java)

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