trim() on an empty EditText returns false android

Question

i have the following

String newWord = (String) addNewWordEdTxt.getText().toString();
Log.d(TAG_WORD, "A:"+ String.valueOf(newWord.trim() == "" ));
Log.d(TAG_WORD, "B:" + String.valueOf( TextUtils.isEmpty(addNewWordEdTxt.getText().toString().trim() )));

anyone know why A is false and B is true for an empty EditText

thanks

Answer 1

anyone know why A is false and B is true for an empty EditText

Because in A case, you are comparing references and not quality so you have to do it like that:

Log.d(TAG_WORD, "A:"+ String.valueOf(newWord.trim().equals("")));

Note: There is one golden rule: If you want to compare Strings, always use equals() method!

Here is nice explanation:

• How do I compare strings in Java?

Answer 2

i thinks java a string compare with any string use .equals() method not used ==

that's like

String.valueOf(newWord.trim().equals(""));