What is the output of the following?
String teams = new String("001"); teams.concat(" 1234"); teams.concat(" 5678"); teams.concat(" 9012"); System.out.println(teams); /*from ww w .jav a 2 s . c o m*/ A. 001 B. 001 1234 5678 9012 C. The code compiles but outputs something else. D. The code does not compile.
Since String is immutable, each call to
concat() returns a new object with the new value.
However, that return value is ignored and the teams variable never changes in value.
Therefore it stays as 001, and Option A is correct.