Which of the following can override a in a derived class ? public void a throws

Question

Which of the following can override a in a derived class ? public void a throws e1, e2, e3 public void a throws e4 public void a throws e3 public void a throws e1, e2, e3 public void a throws e1, e2 Which of the following is true about the use and purpose of the iterator interface? An iterator allows a programmer to efficiently search for an element in a Java Vector. An iterator provides an easy way to sort the elements of a Vector or linked list. An iterator allows a programmer to perform a set operation on each element of a data structure such as a Java Vector or a linked list. None of these. "transient" keyword is used to Serialization Prevent Allow Avoid None of these What if the static modifier is removed from the signature of the main method? The program does not compile The program compiles but does not run The program compiles and runs properly The program throws an exception on compile time This is used to a) Invokes constructor of another class b) Invokes alternate constructor from same class Invokes constructor of super class from sub class Invokes constructor of sub class from super class Static methods only access instance variable instance method static variables and methods both static and instance members

Explanation / Answer

1. C. All Exceptions reported to bethrown by a method must be reported to be thrown by an overridingmethod. 2. C. The purpose of the iterator is to gothrough each element in a Collectionexactly once, making it easy to perform an operation on eachelement. 3. The keyword "transient" is used to stopthe serialization of a field. Depending on your definition,both "prevent" and "avoid" might be acceptable answers. 4. B. A non-static main(String[]) method will be treated like anyother non-static method. The code will compile, but the JREwill throw an Exception because it cannot find the main method. 5. B. The keyword "this" is used to refer to the instanceitself. It can be used to refer to an instance variable (asopposed to a local variable) or to call an alternate constructor ofthe class. 6. C. Static methods can only accessstatic variables and methods. Because a static method doesnot require an instance, for it to access an instance variable ormethod would not make sense.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.