How to use StringBuffer in java What is Yasser Ibrahim @Jobilize

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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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