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problem with string comparison

  Asked By: Anpu    Date: Apr 19    Category: Java    Views: 852
  

here is a segment of code I can't get to work. I've run this through the project
builder debugger on mac os x and it doesn't go into the if and print "help"
when 's' and 'contentFlag" are equal. If I change it to 'if(s != contentFlag)"
it
goes into the if statement everytime as it should. I think there is something
with strings that i'm missing. Can someone help me out?

String contentFlag = "<-- :?: -->";
while ((s = templateFile.readLine()) != null)
{
s = s.trim();
if(s == contentFlag)
System.out.println("help");
// {
// System.out.println("<TD>");
// while ((s2 = contentFile.readLine()) != null)
// System.out.println(s2);
// System.out.println("</TD>");
// }
System.out.println(s);
System.out.println(contentFlag);
}

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3 Answers Found

 
Answer #1    Answered By: Verner Fischer     Answered On: Apr 19

Can you replace the line if(s == contentFlag) with
if(s.equals(contentFlag)) and have a go at you
program.

 
Answer #2    Answered By: Luz Hayes     Answered On: Apr 19

it should read:
if( s.equals(contentFlag))

This will return true if the content of s and the
content of contentFlag are the same.

By putting if(s == contentFlag)
you are checking to see if s and contentFlag refer to
the same object.

 
Answer #3    Answered By: Vidos Fischer     Answered On: Apr 19

you're comparing if the two strings  are the same
reference not same "value" try s.equals(contentFlag)
that should give you your desired bahaviour.

 
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