Validating empty string

[Nico Yukiko]

i wrote if (email==""){
System.out.println("error")
}
but it does not show this is i leave emai as empty???

[Mark Spritzler]

You should always compare Strings using the equals method. == will not always return true.

Mark

[Michael Ernest]

The == operator here tests whether "" and email point are in the same memory location. Even if the variable email did in fact contain an empty string, the == doesn't know that's what you mean. The equals() method in the String class is a test for what's in the String, rather than where the thing is located.

[Stephen Boston]

Comparing Strings was difficult for me as well. I think this is what you are looking for.

import java.*;
 
 
public class Test
{
String email = "";


public Test()
{
if(email.equals(""))
{
System.out.println("Error!");
}
}


public static void main(String[] args)
{
Test app = new Test();
}
}  

[ September 13, 2005: Message edited by: Stephen Boston ]