What is the result?

Given a code fragment:

StringBuilder sb = new StringBuilder ();
String h1 = "HelloWorld";
sb.append("Hello").append ("world");
if (h1 == sb.toString()) {
System.out.println("They match");
}
if (h1.equals(sb.toString())) {
System.out.println("They really match");
}

What is the result?

A.
They match
They really match

B.
They really match

C.
They match

D.
Nothing is printed to the screen

Explanation:

Strings can not be compared with the usual <, <=, >, or >= operators, and the == and != operators
don’t compare the characters in the strings. So the first if statement fails.
Equals works fine on strings. But it does not work here.The second if-statement also fails. The
StringBuffer class does not override the equals method so it uses the equals method of Object.
If a and b are two objects from a class which doesn’t override equals, then
a.equals(b) is the same as a == b