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Question 151 / 297:  What is the result of compiling and running the following code?
public class Tester {

public static void main(String[] args) {

String s = "";

Integer x = 5;

StringBuffer sb = new StringBuffer();

if (x < 15)

s.concat("javachamp");

else

sb.append("javachamp");

System.out.print(s + sb);

}

}

A  javachamp
B  javachamp javachamp
C  No output is produced
D  Compilation error
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Explanation:

Strings are immutable. s.concat() will produce a new String object and will not modify the original String object s.

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