Java SE 8 Programmer I exam (1Z0 | 808) Certification
Duration 120 minutes,
Format: Multiple Choice
Number of Questions: 56
Passing Score: 65%
Questions from 43 to 56
Select the most appropriate answer.
Given:
package demoPackage;
import java.util.Scanner;
public class Demo {
int side, area;
Demo area(Demo object1) {
object1 = new Demo();
object1.side = this.side;
object1.area = object1.side * object1.side;
return object1;
}
public static void main(String[] args) {
Demo obj = new Demo();
try (Scanner s = new Scanner(System.in)) {
System.out.print("Enter length of a side: ");
obj.side = s.nextInt();
}
// insert code here.
System.out.println("Area of a Square: " + obj.area);
}
}
Output:
length of a side: 20
Area of a Square: 400
Which option should replace the comments to get the above output?
Option a: Demo a = obj.area();
Option b: var a = obj.area(obj);
Option c: obj = obj.area(obj);
Option d: var a = obj.area();
Option c: obj = obj.area(obj);
Select the most appropriate answer.
Which of the following is true?
Option a: The java command-line argument is an argument i.e. passed at the time of running the java program.
Option b: When a Java program is executed once, data can be passed any number of times using Command-line arguments.
Option c: Command-line arguments help in a way of outputting data to a program.
Option d: The command-line arguments are passes at the time of compiling of a Java program.
Option a: The java command-line argument is an argument i.e. passed at the time of running the java program.
Select all correct answers.
Which of the following are incorrect?
Option a: 13*13/4+4-3%2 gives 45
Option b: 13+13/4+4-3%2 gives 19
Option c: 13+13/4-4-3%2 gives –15
Option d: 13+13/4-4-3/2 gives 18
Option c: 13+13/4-4-3%2 gives –15
Option d: 13+13/4-4-3/2 gives 18
Select all correct answers.
Which of the following return false?
Option a:
boolean y = false;
if (y = true) // do some thing;
Option b:
int value1 = 1;
int value2 = 2;
if(!(value1 == value2)) // do some thing;
Option c:
int n = 9; if(n % 2 == 0) // do some thing;
Option d:
int n = -10; if(n > 0) // do some thing;
Option c:
int n = 9; if(n % 2 == 0) // do some thing;
Option d:
int n = -10; if(n > 0) // do some thing;
Select all correct answers.
Assuming that country is set for each class, Which two are correct?
Given:
10. public class DayLightSavings{
11. private String country, name;
12. public getCountry() { return country; }
13. }
and:
24. class Asia extends DayLightSavings{
25. public String getCountry() { return super.country; }
26. }
27.
28. class Europe extends DayLightSavings{
29. public String getCountry(String timeZone) {
30. return super.getCountry();
31. }
32. }
Option a: Asia returns correct values.
Option b: Generates compile time error on line 12.
Option c: An exception is thrown at runtime.
Option d: Asia and Europe both return correct values.
Option e: Compilation fails because of an error at line 25.
Option f: Compilation fails because of an error at line 30.
Option b: Europe returns correct values.
Option e: Compilation fails because of an error at line 25.
Select all correct answers.
Under which three circumstances will the code finally block is executed?
Given:
31. // some code here
32. try {
33. // some code here
34. } catch (SomeException se) {
35. // some code here
36. } finally {
37. // some code here
38. }
Option a: The instance gets garbage collected.
Option b: The code on line 33 throws an exception.
Option c: The code on line 35 throws an exception.
Option d: The code on line 31 throws an exception.
Option e: The code on line 33 executes successfully.
Option b: The code on line 33 throws an exception.
Option c: The code on line 35 throws an exception.
Option e: The code on line 33 executes successfully.
Select the most appropriate answer.
What is the result?
Given:
11. public static void main(String[] args) {
12. Object obj =new String[] { "Amar", "Akbar", "Antony" };
13. String[] someArray = (String[])obj;
14. for (String i: someArray) System.out.print(i +" ");
15. }
Option a: Amar Akbar Antony
Option b: Compilation fails because of an error in line 12.
Option c: Compilation fails because of an error in line 13.
Option d: Compilation fails because of an error in line 14.
Option e: A ClassCastException is thrown at runtime.
Option a: Amar Akbar Antony
Select all correct answers.
Which of the following is incorrect with respect to Java class?
Option a: Class is a set of object which shares common characteristics/ behavior and common properties/ attributes.
Option b: Class is a real-world entity. It is just a template or blueprint or prototype from which objects are created.
Option c: Class occupy memory.
Option d: Class is a group of variables of different data types and a group of methods.
Option b: Class is a real-world entity. It is just a template or blueprint or prototype from which objects are created.
Option c: Class occupy memory.
Select the most appropriate answer.
Below code is an example of?
public class Employee {
private String name;
private String idNum;
private int age;
public int getAge() {
return age;
}
public String getName() {
return name;
}
public String getIdNum() {
return idNum;
}
public void setAge( int newAge) {
age = newAge;
}
public void setName(String newName) {
name = newName;
}
public void setIdNum( String newId) {
idNum = newId;
}
}
Option a: Abstraction
Option b: Encapsulation
Option c: polymorphism
Option d: None of the above.
Option b: Encapsulation
Select the most appropriate answer.
Given:
1. public class Game implements Comparable<Game > {
2. private int wins, losses;
3. public Game(int w, int 1) { wins = w; losses = 1; }
4. public int getWins() { return wins; }
5. public int getLosses() { return losses; }
6. public String toString() {
7. return “<“ + wins + “,“ + losses + “>”;
8. }
9. // insert code here
10. }
Which method will complete this class?
Option a: public int compareTo(Object o) {/*mode code here*/}
Option b: public int compareTo(Game other) {/*more code here*/}
Option c: public int compare(Game g1,Game g2){/*more code here*/}
Option d: public int compare(Object o1,Object o2){/*more code here*/}
Option b: public int compareTo(Game other) {/*more code here*/}
Select the most appropriate answer.
Given:
1. public class Test {
2. private String str;
3. public Test (String name) { this.str= str; }
4. public boolean equals(Test t) {
5. return t.str.equals(this.str);
6. }
7. }
Which is true?
Option a: The equals method does NOT properly override the Object.equals method.
Option b: Compilation fails because the private attribute t.str cannot be accessed in line 5.
Option c: To work correctly with hash-based data structures, this class must also implement the hashCode method.
Option d: When adding Test objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.
Option a: The equals method does NOT properly override the Object.equals method.
Select all correct answers.
Which of the following are Assignment operators?
Option a: =
Option b: <=
Option c: !=
Option d: +=
Option a: =
Option d: +=
Select all correct answers.
Given:
11. public class Commander {
12. public static void main(String[] args) {
13. String myProp = /* insert code here */
14. System.out.println(myProp);
15. }
16. }
and the command line: java -Dprop.custom=HelloWorld Commander
Which two, placed on line 13, will produce the output HelloWorld?
Option a: System.load(”prop.custom”);
Option b: System.getenv(”prop.custom”);
Option c: System.property(”prop.custom”);
Option d: System.getProperty(”prop.custom”);
Option e: System.getProperties().getProperty(”prop.custom”);
Option d: System.getProperty(”prop.custom”);
Option e: System.getProperties().getProperty(”prop.custom”);
Select all correct answers.
Which of the following are true?
Option a: Encapsulation doesn’t hide implementation behind an interface (or API).
Option b: IS-A refers to inheritance or implementation.
Option c: IS-A is expressed with the keyword extends or implements.
Option d: IS-A, “inherits from,” and “is a subtype of” are not equivalent expressions.
Option e: HAS-A means an instance of one class “has a” reference to an instance of another class or another instance of the same class.
Option b: IS-A refers to inheritance or implementation.
Option c: IS-A is expressed with the keyword extends or implements.
Option e: HAS-A means an instance of one class “has a” reference to an instance of another class or another instance of the same class.
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