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Q1. Given the following classes:
Which two options fail to compile when placed at line n1 of the main method?
A. employee.salary = 50_000;
B. director.salary = 80_000;
C. employee.budget = 200_000;
D. manager.budget = 1_000_000;
E. manager.stockOption = 500;
F. director.stockOptions = 1_000;
Answer: C,E
Q2. Given:
public class ScopeTest {
int j, int k;
public static void main(String[] args) {
ew ScopeTest().doStuff(); }
void doStuff() {
nt x = 5;
oStuff2();
System.out.println("x");
}
void doStuff2() {
nt y = 7;
ystem.out.println("y");
or (int z = 0; z < 5; z++) {
ystem.out.println("z");
ystem.out.println("y");
}
Which two items are fields?
A. j
B. k
C. x
D. y
E. z
Answer: A,B
Q3. Given:
What is the output?
A. 2015-03-27
B. 2015-04-27
C. 2015-02-27 D. Compilation fails due to error at line 6.
E. Compilation fails due to error at line 8.
Answer: A
Explanation:
To create we have used following method with LocalDate class;
public static LocalDate of(intyear, int month, int dayOfMonth)
Here we need to remember that month is not zero based so if you pass 1 for month, then
month will be January.
Then we have used period object of 1 day and add to date object which makes current date
to next day, so final output is 2015-03-27. Hence option A is correct.
https://docs.oracle.com/javase/tutorial/datetime/iso/datetime.html
Q4. Given the code format:
Which code fragment must be inserted at line 6 to enable the code to compile?
A. DBConfiguration f; return f;
B. Return DBConfiguration;
C. Return new DBConfiguration;
D. Retutn 0;
Answer: B
Q5. Which statement is true about the default constructor of a top-level class?
A. It can take arguments.
B. It has private access modifier in its declaration.
C. It can be overloaded.
D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.
Answer: D
Explanation: In both Java and C#, a "default constructor" refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. The default constructor is also empty, meaning that it does nothing. A programmer-defined constructor that takes no parameters is also called a default constructor.
Q6. Given:
Which statement is true?
A. Both p and s are accessible by obj.
B. Only s is accessible by obj.
C. Both r and s are accessible by obj.
D. p, r, and s are accessible by obj.
Answer: B
Q7. Given the following code:
What is the output?
A. 4
4
B. 3
5
C. 4
7
D. 5
4
E. 4
5
F. 4
21
Answer: E
Q8. public class ForTest {
public static void main(String[] args) {
int[] arrar = {1,2,3};
for ( foo ) {
}
}
}
Which three are valid replacements for foo so that the program will compiled and run?
A. int i: array
B. int i = 0; i < 1; i++
C. ;;
D. ; i < 1; i++
E. ; i < 1;
Answer: A,B,C
Q9. Given:
package p1;
public interface DoInterface {
void method1(int n1); // line n1
}
package p3;
import p1.DoInterface;
public class DoClass implements DoInterface {
public DoClass(int p1) { }
public void method1(int p1) { } // line n2
private void method2(int p1) { } // line n3
}
public class Test {
public static void main(String[] args) {
DoInterface doi= new DoClass(100); // line n4
doi.method1(100);
doi.method2(100);
}
}
Which change will enable the code to compile?
A. Adding the public modifier to the declaration of method1 at line n1
B. Removing the public modifier from the definition of method1 at line n2
C. Changing the private modifier on the declaration of method 2 public at line n3
D. Changing the line n4 DoClass doi = new DoClass ( );
Answer: C
Explanation: Private members (both fields and methods) are only accessible inside the class they are declared or inside inner classes. private keyword is one of four access modifier provided by Java and its a most restrictive among all four e.g. public, default(package), protected and private.
Read more: http://javarevisited.blogspot.com/2012/03/private-in-java-why-should-you-always.html#ixzz3Sh3mOc4D
Q10. The protected modifier on a Field declaration within a public class means that the field ______________.
A. Cannot be modified
B. Can be read but not written from outside the class
C. Can be read and written from this class and its subclasses only within the same package
D. Can be read and written from this class and its subclasses defined in any package
Answer: D
Reference:
http://beginnersbook.com/2013/05/java-access-modifiers/
