StringBuilder .equals Java

Question

class strb {      static public void main(String...string)     {          StringBuilder s1 = new StringBuilder("Test");          StringBuilder s2 = new StringBuilder("Test");           System.out.println(s1);          System.out.println(s2);          System.out.println(s1==s2);          System.out.println(s1.equals(s2)); //Line 1          System.out.println(s1.toString()==s2.toString()); //Line 2          if(s1.toString()==s2.toString())System.out.println("True"); //Line 3     }  } 

And the output is

Test Test false false 

Just have a quick question on .equals.

Regardless of the object content, does .equals return true only if both the object references point to the same object ?

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EDIT : Now I understand the part about the .equals but why does Line 2 and Line 3 also not return true ?

EDIT : I believe == looks at the reference variable's address and so s1 and s2 cannot be equal.correct me if my assumption is not right

Answer 1

Yes, StringBuilder does not override Object's .equals() function, which means the two object references are not the same and the result is false.

For StringBuilder, you could use s1.toString().equals(s2.toString())

For your edit, you're calling the == operator on two different String objects. The == operator will return false because the objects are different. To compare Strings, you need to use String.equals() or String.equalsIgnoreCase()

It's the same problem you were having earlier