Câu 67: GSSP-Java: GIAC Secure Software Programmer-Java

Mary works as a Software Developer for ABC Solutions Inc. She writes the following code. public class StringMethods { public static void main(String[] args) {String str = new String("abc");str.concat("xyz");StringBuffer strBuf = new StringBuffer(" 123");strBuf.append(" no");System.out.println(str + strBuf);}}What will be the output when Mary tries to compile and execute the code?

1. A. Compilation will fail.
2. B. The program will print abc xyz 123 no when run.
3. C. The program will print xyz 123 no when run.
4. D. The program will print abc 123 no when run. — đáp án hiện tại