Introducing The New!
Surepassexam Collection
Get Unlimited Access to all
Surepassexam's PREMIUM files
Q1. Given:
What is the result?
A. Base DerivedA
B. Base DerivedB
C. DerivedB DerivedB
D. DerivedB DerivedA
E. A classcast Except ion is thrown at runtime.
Answer: C
Q2. Given:
What is the result?
A. 100 210
B. Compilation fails due to an error in line n1
C. Compilation fails due to an error at line n2
D. Compilation fails due to an error at line n3
Answer: C
Q3. 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
Q4. Given:
package p1;
public class Test {
static double dvalue;
static Test ref;
public static void main(String[] args) {
System.out.println(ref);
System.out.println(dvalue);
}
}
What is the result?
A. p1.Test.class
0.0
B. <the summary address refrenced by ref> 0.000000
C. Null
0.0
D. Compilation fails
E. A NullPointerException is thrown at runtime
Answer: C
Q5. Consider following interface.
Which of the following will create instance of Runnable type?
A. Runnable run = 0 -> {System.out.println("Run");}
B. Runnable run = 0 -> System.outprintlnfRun");
C. Runnable run = 0 > System.outprintlnfRun");
D. Runnable run = > System.ouLprintlnfRun"};
E. None of the above.
Answer: A
Explanation:
Option A is the correct answer.
To create we have used following method with LocalDate class;
public static LocalDate of(intyear, int month, intdayOfMonth)
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.
Q6. Given:
What is the output?
A. 1Z0
B. 1Z0-808
C. An exception will be thrown.
D. Compilation fails due to error at line 3.
E. Compilation tails due to error at line 4.
Answer: E
Explanation:
Option E is the correct answer. Code fails to compile because there is no method called concert in StringBuilder class. The concert method is in String class. Hence option E is correct Here we should have used append method of StringBuilder class, in that case option B would be correct. https://docs.oracle.com/javase/tutorial/java/data/buffers.html
Q7. Given:
Which two code fragments are valid?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
Answer: B,C
Explanation: When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (C). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract—it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
Q8. Given the code fragment:
What is the result?
A. 28false29 true
B. 285 < 429 true
C. true true
D. compilation fails
Answer: C
Q9. 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
Q10. Given the code fragment:
public class Test {
public static void main(String[] args) {
boolean isChecked = false;
int arry[] = {1,3,5,7,8,9};
int index = arry.length;
while ( <code1> ) {
if (arry[index-1] % 2 ==0) {
isChecked = true;
}
<code2>
}
System.out.print(arry(index]+", "+isChecked));
}
}
Which set of changes enable the code to print 1, true?
A. Replacing <code1> with index > 0 and replacing <code2> with index--;
B. Replacing <code1> with index > 0 and replacing <code2> with --index;
C. Replacing <code1> with index > 5 and replacing <code2> with --index ;
D. Replacing <code1> with index and replacing <code2> with --index ;
Answer: A
Explanation:
Note: Code in B (code2 is --index;). also works fine.
Q11. Which three statements describe the object-oriented features of the Java language?
A. Objects cannot be reused.
B. A subclass can inherit from a superclass.
C. Objects can share behaviors with other objects.
D. A package must contain more than one class.
E. Object is the root class of all other objects.
F. A main method must be declared in every class.
Answer: B,C,E
Q12. Given:
class Overloading {
int x(double d) {
System.out.println("one");
return 0;
}
String x(double d) {
System.out.println("two");
return null;
}
double x(double d) {
System.out.println("three");
return 0.0;
}
public static void main(String[] args) {
new Overloading().x(4.0);
}
}
What is the result?
A. One
B. Two
C. Three
D. Compilation fails.
Answer: D
Q13. Given the code fragment:
What is the result?
A. 20
B. 25
C. 29
D. Compilation fails
E. AnArrayIndexOutOfBoundsException is thrown at runtime
Answer: A
Q14. 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
Q15. Given the code fragment:
What is the result?
A. 1:2:3:4:5:
B. 1:2:3:
C. Compilation fails.
D. An ArrayoutofBoundsException is thrown at runtime.
Answer: A