Cannot Compare Strings Android Studio [duplicate]

This question already has an answer here:

• How do I compare strings in Java? 23 answers

this is a basic knowledge but I get frustrated after 3 hours of trying. I am running codes in Android Studio and I just want to compare the result of 2 strings This is my codes

result=stringBuilder.toString();
        String wanted="SUCCESS";

        if(result.equalsIgnoreCase("SUCCESS"))
        {
            Log.d("RESULT","FINALLY 1");
        }
        else if(result.equals("SUCCESS")) {
            Log.d("RESULT", "FINALLY 2");
        }
        else if(result=="SUCCESS")
        {
            Log.d("RESULT","FINALLY 3");

        }
        else if("SUCCESS".equals(result))
        {
            Log.d("RESULT","FINALLY 4");
        }
        else if(result.equals(wanted))
        {
            Log.d("RESULT","FINALLY 5");
        }
        else
        {
            Log.d("RESULT",result);
        }

I have tried every options available on webs but I got the same results and you can see that var "result" is "SUCCESS"

  11-11 23:31:01.477    8116-8152/com.example.asus.ucomm D/RESULT﹕ SUCCESS

What did I do here that get errors from just comparing strings? Am I too tired until I missed something? Please help.