Exam Objectives  Product Description Sun Certified Enterprise Architect for J2EE Technology  (SCEA  310-051)

 Given:
1. class Super {
2. public float getNum() { return 3.of; }
3. ]
4.
5. public class Sub extends Super {
6.
7. }
Which method, places at line 6, will cause a compiler error?
A. public float getNum() { return 4.0f; }
B. public void getNum() {}
C. public void getNum(double d) {}
D. public double getNum(float d) { return 4.0d; }

 Given:
1. public class X {
2. public Object m() {
3. Object o = new Float(3.14F);
4. Object [] oa = new Object[1];
5. oa[0] = o;
6. o = null;
7. oa[0] = null;
8. return o;
9. }
10. }
When is the Float object, created in line 3, eligible for garbage collection?
A. Just after line 5.
B. Just after line 6.
C. Just after line 7.
D. Just after line 8 (that is, as the method returns)