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QUESTION NO:11
Given the code fragment:
What is the result?
A. 10 8 6 4 2 0
B. 10 8 6 4 2
C. AnArithmeticException is thrown at runtime
D. The program goes into an infinite loop outputting: 10 8 6 4 2 0. . .
E. Compilation fails
Correct Answer: B
Explanation
QUESTION NO:6
Given the code fragment:
Assume that the system date is June 20, 2014. What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Correct Answer: A
Explanation
QUESTION NO:31
Which two actions will improve the encapsulation of a class?
A. Changing the access modifier of a field from public to private
B. Removing the public modifier from a class declaration
C. Changing the return type of a method to void
D. Returning a copy of the contents of an array or ArrayList instead of a direct reference
Correct Answer: AD
Explanation
Explanation/Reference:
Reference:
http://www.tutorialspoint.com/java/java_access_modifiers.htm
QUESTION NO:21
Given:
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Correct Answer: C
Explanation
QUESTION NO:33
Given the following array:
Which two code fragments, independently, print each element in this array?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
F. Option F
Correct Answer: BE
Explanation
Explanation/Reference:
Explanation: All the remaining options have syntax errors
QUESTION NO:36
Given:
What is the result?
A. 97 98
99 100 null null null
B. 91 98
99 100 101 102 103
C. Compilation rails.
D. A NullPointerException is thrown at runtime.
E. An ArraylndexOutOfBoundsException is thrown at runtime.
Correct Answer: A
Explanation
QUESTION NO:5
Given:
class Mid {
public int findMid(int n1, int n2) {
return (n1 n2) / 2;
}
}
public class Calc extends Mid {
public static void main(String[] args) {
int n1 = 22, n2 = 2;
// insert code here
System.out.print(n3);
}
}
Which two code fragments, when inserted at // insert code here, enable the code to compile and print 12?
A. Calc c = new Calc();
int n3 = c.findMid(n1,n2);
B. int n3 = super.findMid(n1,n3);
C. Calc c = new Mid();
int n3 = c.findMid(n1, n2);
D. Mid m1 = new Calc();
int n3 = m1.findMid(n1, n2);
E. int n3 = Calc.findMid(n1, n2);
Correct Answer: AD
Explanation
Explanation/Reference:
Incorrect:
Not B: circular definition of n3.
Not C: Compilation error. line Calc c = new Mid(); required: Calc
found: Mid
Not E: Compilation error. line int n3 = Calc.findMid(n1, n2); non-static method findMid(int,int) cannot be referenced from a static context
QUESTION NO:15
Which three statements are true about the structure of a Java class?
A. A class can have only one private constructor.
B. A method can have the same name as a field.
C. A class can have overloaded static methods.
D. A public class must have a main method.
E. The methods are mandatory components of a class.
F. The fields need not be initialized before use.
Correct Answer: ABC
Explanation
Explanation/Reference:
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
QUESTION NO:2
Given:
What is the result?
A. box
B. nbo
C. bo
D. nb
E. An exception is thrown at runtime
Correct Answer: E
Explanation
QUESTION NO:45
Given the code fragment:
What is the result?
A. Reading Card
Checking Card
B. Compilation fails only at line n1.
C. Compilation fails only at line n2.
D. Compilation fails only at line n3.
E. Compilation fails at both line n2 and line n3.
Correct Answer: D
Explanation
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