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Download Java SE 8 Programmer I Exam Dumps
NEW QUESTION 46
Given the code fragment:
Which code fragment prints red: blue: small: medium?
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: B
NEW QUESTION 47
Given:
And given the commands:
What is the result?
- A. true false
- B. false false
- C. true true
- D. A ClassCastExceptionis thrown at runtime.
- E. TRUE null
Answer: C
NEW QUESTION 48
Which one of the following code examples uses valid Java syntax?
- A. Option A
- B. Option B
- C. Option D
- D. Option C
Answer: A
NEW QUESTION 49
Which three statements are true about the structure of a Java class?
- A. A public class must have a main method.
- B. The fields need not be initialized before use.
- C. A method can have the same name as a field.
- D. A class can have only one private constructor.
- E. A class can have overloaded static methods.
- F. The methods are mandatory components of a class.
Answer: C,D,E
Explanation:
A: Private constructors prevent a class from being explicitly instantiated by its
callers.
If the programmer does not provide a constructor for a class, then the system will always
provide a default, public no-argument constructor. To disable this default constructor,
simply add a private no-argument constructor to the class. This private constructor may be
empty.
B: The following works fine:
int cake() {
int cake=0;
return (1);
}
C: We can overload static method in Java. In terms of method overloading static method
are just like normal methods and in order to overload static method you need to provide
another static method with same name but different method signature.
Incorrect:
Not D: Only a public class in an application need to have a main method.
Not E:
Example:
class A
{
public string something;
public int a;
}
Q: What do you call classes without methods? Most of the time: An anti pattern.
Why? Because it faciliates procedural programming with “Operator” classes and data structures. You separate data and behaviour which isn’t exactly good OOP.
Often times: A DTO (Data Transfer Object)
Read only datastructures meant to exchange data, derived from a business/domain object.
Sometimes: Just data structure.
Well sometimes, you just gotta have those structures to hold data that is just plain and simple and has no operations on it.
Not F: Fields need to be initialtized. If not the code will not compile.
Example:
Uncompilable source code – variable x might not have been initialized
NEW QUESTION 50
……
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