When we use the == operator, we are actually comparing two object references, to see if they point to the same object. We cannot compare, for example, two strings for equality, using the == operator. We must instead use the .equals method, which is a method inherited by all classes from java.lang.Object.

Ex. String Comparison

     String abc = "abc"; String def = "def";

// Bad way if ( (abc + def) == "abcdef" ) { ….. }

// Good way if ( (abc + def).equals("abcdef") ) { ..... }