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Java

Posted by John Carr
John Carr
1,921 Points

Or (||) Statements

While working within the Workspace I ran into a problem with using the ||(or) command. It only works for the first "if" statement and not the others. I have gone back over 20x to see if I did something wrong but everything check out. What could be the problem? Could it be just a system or software error? (Below is part of the code that seems to be the problem)

String name = console.readLine("Enter a name: "); 
String adjective = console.readLine("Enter an adjective: "); 
String noun = console.readLine("Enter a noun: ");

if (noun.equalsIgnoreCase("dork")|| noun.equalsIgnoreCase("jerk")|| noun.equalsIgnoreCase("nerd")) {
  console.printf("That language is not allowed. Exiting. \n\n"); 
  System.exit(0); 
}

1 Answer

Lukas Baumgartner
Lukas Baumgartner
14,817 Points 
String name = console.readLine("Enter a name: "); 
String adjective = console.readLine("Enter an adjective: "); 
String noun = console.readLine("Enter a noun: ");
 if (noun.equalsIgnoreCase("dork")|| noun.equalsIgnoreCase("jerk")|| noun.equalsIgnoreCase("nerd")) {
      console.printf("That language is not allowed. Exiting. \n\n"); 
System.exit(0); 
}

Well that'S how an OR works. I guess that your noun is dork? That way your first statement is true, and the other cases can be ignored since an or just needs one TRUE to pass. If you use AND (&&) all of your statements have to be true so that the whole if is true. 

A truthtable for OR looks like this:
x   y  Result
0   0   0
0   1   1
1   0   1
1   1   1

A truthtable for AND looks like this:
x   y  Result
0   0   0
0   1   0
1   0   0
1   1   1


1 = true; 0 = false