Can't figure out whats wrong with this IF statement

Question

Hey.
I must be tired cause I just can't figure out why this IF statement doesn't work. It's probably something silly but please help me get it right. The user is prompted with a form (textfield) and I'm gonna check if its the right password (this is not the reason im doing this but it works good for this example).
if(displayable == form){
          String correctPassword = "abcd";
          System.out.println("Input: " + textfield.getString());
          System.out.println("Correct: " + correctPassword);
          if(textfield.getString() == correctPassword) {
               System.out.println("Password is correct");
               Display.getDisplay(this).setCurrent(mList);
          else {
               System.out.println("Wrong password");
               destroyApp(true);
               notifyDestroyed();
}Even though i enter the correct password, it still thinks it is incorrect. This is how the WTK compiler outputs the above statement.
Input: abcd
Correct: abcd
Wrong passwordObviously the passwords DO match, so what am I doing wrong?

Answer 1

The == comparison operator returns true for equal primitives OR for variable references to the same object.
Classes (usually) override the .equals (Object obj) method inherited from Object to return true when objects of the class are essentially equivalent.
Run this java code segment and try to understand the output.String aStr = "A string";
String bStr = aStr;
if (aStr == bStr) System.out.println ("== true");
else System.out.println("== false");
if (aStr.equals (bStr)) System.out.println (".equals true");
else System.out.println(".equals false");
System.out.println();
bStr = new String ("A string");
if (aStr == bStr) System.out.println ("== true");
else System.out.println("== false");
if (aStr.equals (bStr)) System.out.println (".equals true");
else System.out.println(".equals false");
System.out.println();
bStr = new String ("Some String");
if (aStr == bStr) System.out.println ("== true");
else System.out.println("== false");
if (aStr.equals (bStr)) System.out.println (".equals true");
else System.out.println(".equals false");Ask again if it's not clear enough. But first, read the API for Object.equals (Object obj) to understand the contract of .equals (...)
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