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Q71. Which three statements are benefits of encapsulation?
A. Allows a class implementation to change without changing t he clients
B. Protects confidential data from leaking out of the objects
C. Prevents code from causing exceptions
D. Enables the class implementation to protect its invariants
E. Permits classes to be combined into the same package
F. Enables multiple instances of the same class to be created safely
Answer: A,B,D
Q72. 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
Q73. 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.
Q74. Given:
What is the result?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: D
Q75. Which two are Java Exception classes?
A. SercurityException
B. DuplicatePathException
C. IllegalArgumentException
D. TooManyArgumentsException
Answer: A,C
Q76. Given:
public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new
SampleClass();
sc = asc;
System.out.println("sc: " + sc.getClass());
System.out.println("asc: " + asc.getClass());
}}
class AnotherSampleClass extends SampleClass {
}
What is the result?
A. sc: class Object asc: class AnotherSampleClass
B. sc: class SampleClass asc: class AnotherSampleClass
C. sc: class AnotherSampleClass asc: class SampleClass
D. sc: class AnotherSampleClass asc: class AnotherSampleClass
Answer: D
Q77. Given:
What is the result?
A. 2 4 6 8 10 12
B. 2 4 6 8 10 12 14
C. Compilation fails
D. The program prints multiple of 2 infinite times
E. The program prints nothing
Answer: B
Q78. 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/
Q79. Given the code fragment:
What is the result?
A. true true
B. true false
C. false false
D. false true
Answer: C
Q80. Given the following four Java file definitions:
// Foo.java
package facades;
public interface Foo { }
// Boo.java
package facades;
public interface Boo extends Foo { }
// Woofy.java
package org.domain
// line n1
public class Woofy implements Boo, Foo { }
// Test.java
package.org;
public class Test {
public static void main(String[] args) {
Foo obj=new Woofy();
Which set modifications enable the code to compile and run?
A. At line n1, Insert: import facades;At line n2, insert:import facades;import org.domain;
B. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.*;
C. At line n1, Insert: import facades.*;At line n2, insert:import facades.Boo;import org.*;
D. At line n1, Insert: import facades.Foo, Boo;At line n2, insert:import org.domain.Woofy;
E. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.domain.Woofy;
Answer: E