Can any body help me with this problem? It's on Oca book... the answer is (equal) but I don't know why...?

Question

String a = "";
a += 2;
a += 'c';
a += false;
if ( a == "2cfalse") System.out.println("==");
if ( a.equals("2cfalse")) System.out.println("equals");

Answer 1

In java, '==' compares refferences not content.
equals() method compares content(values)...

Answer 2

Because == is for comparing numbers.

For comparing String, we need to use the equals() method.

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html