Conditions on field

[Mike Jenkins]

I am processing form values using Enumeration class in a JSP and would like to know how to deal with fieldnames I dont want.
In the below I dont want to display FieldA but the output shows it even when I try and write condition for it:

String myData = "";
Enumeration e=request.getParameterNames();
while(e.hasMoreElements())
{
String name=(String)e.nextElement();
String value=request.getParameter(name);
    if(name != "FieldA")
    {
        myData += name + "<br>";
    }
}
out.println(myData);

Output:
FieldCC
FieldA
OtherField
aField
..more fields etc..

The FieldA should not output.

[Bear Bibeault]

     if(name != "FieldA")
   

Is this the right way to do String comparisons in Java?

[Mike Jenkins]

I am not sure how would I do String comparison?

[Bear Bibeault]

Are you new to Java?

In Java, the == operator (and its relations like !=) is a test for identity, not for equality. It asks, "are these objects the same?". It does not ask "do these objects have the same value?"

For that, you need to use the equals() method of String.
[ March 02, 2007: Message edited by: Bear Bibeault ]

[Mike Jenkins]

Thanks for quick reply!

I tried this and it still not working:

 
String myData = "";
Enumeration e=request.getParameterNames();
while(e.hasMoreElements()){String name=(String)e.nextElement();String value=request.getParameter(name);
 
if (!name.equals("FieldA"))   
{        
    myData += name + "<br>";    
}
}
out.println(myData);

It still outputs:
Output:
FieldCC
FieldA
OtherField
aField
..more fields etc..
[ March 02, 2007: Message edited by: Mike Jenkins ]

[Mike Jenkins]

Sorry to take your time.

It did work:

I had a misspelling.
I printed the article about the equals() method and I appreciate your reponses and time!
[ March 02, 2007: Message edited by: Mike Jenkins ]

[Bear Bibeault]

No problem, it's what Javaranch is for.

I'd strongly suggest beefing up your Java skills before delving much more deeply into JSP. You'll find that time well spent.