Question about the Java objects' equals() method

Question

I have a question about the object X.equals(Y).

I use Sonar and it says that I have to move the "" string literal on the left side of this string comparison: !date.equals("").

So I did that: !("").equals(date) but I don't really know if it is right or not.

• gnat: Possible duplicate of Is "use "abc".equals(myString) instead of myString.equals("abc") to avoid null pointer exception" already problematic in terms of business logic?
• Bart van Ingen Schenau: Possible duplicate of When comparing a string variable to a string literal with .equals(), is there a standard practice for the order of items?

Answer 1

!"".equals(date) and !("").equals(date) and !(("")).equals(date) and !(((""))).equals(date) and !("".equals(date)) all return the same thing.

So you correctly switched the string literal with the variable, you just added some not needed parentheses.