String a = null; a.concat(“abc”); a.concat(“def”); System.out.println(a); What is the result?()
A. abc B. null C. abcdef D. Compilation fails. E. The code runs with no output. F. An exception is thrown at runtime.
public static void main( String[] args ) { Integer a = new Integer(10); Integer b = new Integer(10); Integer c = a; int d = 10; double e = 10.0; } Which three evaluate to true?()
A. (a == c) B. (d == e) C. (b == d) D. (a == b) E. (b == c) F. (d == 10.0)
public class Test { public static void add3 (Integer i) { int val = i.intValue(); val += 3; i = new Integer(val); } public static void main(String args[]) { Integer i = new Integer(0); add3(i); System.out.println(i.intValue()); } } What is the result? ()
A. 0 B. 3 C. Compilation fails. D. An exception is thrown at runtime.