Java Quiz 1 From Java Tutorials

25 Questions | By Avni1488 | Updated: Mar 20, 2022 | Attempts: 878

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1.
- Given:
- 11. public interface Status {
- 12. /* insert code here */ int MY_VALUE = 10;
- 13. }
- Which three are valid on line 12? (Choose three.)
- A.
  
  Final
- B.
  
  Static
- C.
  
  Native
- D.
  
  Public
- E.
  
  Private
- F.
  
  Abstract
- G.
  
  Protected
2.
- Given:
- 10. public class Bar {
- 11.static void foo(int...x) {
- 12. // insert code here
- 13. }
- 14. }
- Which two code fragments, inserted independently at line 12, will allow
- the class to compile? (Choose two.)
- A.
  
  Foreach(x) System.out.println(z);
- B.
  
  for(int z : x) System.out.println(z);
- C.
  
  while( x.hasNext()) System.out.println( x.next());
- D.
  
  For( int i=0; i< x.length; i++ ) System.out.println(x[i]);
3.
- Given:
- 11. public class Test {
- 12. public static void main(String [] args) {
- 13. int x =5;
- 14. boolean b1 = true;
- 15. boolean b2 = false;
- 16.
- 17.if((x==4) && !b2)
- 18. System.out.print(”l “);
- 19. System.out.print(”2 “);
- 20. if ((b2 = true) && b1)
- 21. System.out.print(”3 “);
- 22. }
- 23. }
- What is the result?
- A.
  
  2
- B.
  
  3
- C.
  
  1 2
- D.
  
  2 3
- E.
  
  1 2 3
- F.
  
  Compilation fails.
- G.
  
  Au exceptional is thrown at runtime.
4.
- 4. 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. }
- Under which three circumstances will the code on line 37 be executed?
- (Choose three.)
- A.
  
  The instance gets garbage collected.
- B.
  
  The code on line 33 throws an exception.
- C.
  
  The code on line 35 throws an exception.
- D.
  
  The code on line 31 throws an exception.
- E.
  
  The code on line 33 executes successfully.
5.
- Given:
- 10. interface Foo {}
- 11. class Alpha implements Foo { }
- 12. class Beta extends Alpha {}
- 13. class Delta extends Beta {
- 14. public static void main( String[] args) {
- 15. Beta x = new Beta();
- 16. // insert code here
- 17. }
- 18. }
- Which code, inserted at line 16, will cause a
- java.lang.ClassCastException?
- A.
  
  Alpha a = x;
- B.
  
  Alpha a = x;
- C.
  
  Foo f= (Delta)x;
- D.
  
  Foo f= (Alpha)x;
- E.
  
  Beta b = (Beta)(Alpha)x;
6.
- Given:
- • d is a valid, non-null Date object
- • df is a valid, non-null DateFormat object set to the
- current locale
- What outputs the current locales country name and the appropriate
- version of d’s date?
- A.
  
  Locale loc = Locale.getLocale(); System.out.println(loc.getDisplayCountry() + “ “+ df.format(d));
- B.
  
  Locale loc = Locale.getDefault(); System.out.println(loc.getDisplayCountry() + “ “ + df.format(d));
- C.
  
  Locale bc = Locale.getLocale(); System.out.println(loc.getDisplayCountry() + “ “+ df.setDateFormat(d));
- D.
  
  Locale loc = Locale.getDefault(); System.out.println(loc.getDispbayCountry() + “ “+ df.setDateFormat(d));
7.
- Given:
- 20. public class CreditCard {
- 21.
- 22. private String cardlD;
- 23. private Integer limit;
- 24. public String ownerName;
- 25.
- 26. public void setCardlnformation(String cardlD,
- 27. String ownerName,
- 28. Integer limit) {
- 29. this.cardlD = cardlD;
- 30. this.ownerName = ownerName;
- 31. this.limit = limit;
- 32. }
- 33. }
- Which is true?
- A.
  
  The class is fully encapsulated.
- B.
  
  The code demonstrates polymorphism.
- C.
  
  The ownerName variable breaks encapsulation.
- D.
  
  The cardlD and limit variables break polymorphism.
- E.
  
  The setCardlnformation method breaks encapsulation.
8.
- Assume that country is set for each class.
- Given:
- 10. public class Money {
- 11. private String country, name;
- 12. public getCountry() { return country; }
- 13.}
- and:
- 24. class Yen extends Money {
- 25. public String getCountry() { return super.country; }
- 26. }
- 27.
- 28. class Euro extends Money {
- 29. public String getCountry(String timeZone) {
- 30. return super.getCountry();
- 31. }
- 32. }
- Which two are correct? (Choose two.)
- A.
  
  Yen returns correct values.
- B.
  
  Euro returns correct values.
- C.
  
  An exception is thrown at runtime.
- D.
  
  Yen and Euro both return correct values.
- E.
  
  Compilation fails because of an error at line 25.
- F.
  
  Compilation fails because of an error at line 30.
9.

Which Man class properly represents the relationship “Man has a best friend who is a Dog”?
- A.
  
  class Man extends Dog { }
- B.
  
  class Man implements Dog { }
- C.
  
  Class Man { private BestFriend dog; }
- D.
  
  Class Man { private Dog bestFriend; }
- E.
  
  Class Man { private Dog }
- F.
  
  Class Man { private BestFriend }
10.
- Given:
- 11. public class Person {
- 12. private name;
- 13. public Person(String name) {
- 14. this.name = name;
- 15. }
- 16. public int hashCode() {
- 17. return 420;
- 18. }
- 19. }
- Which is true?
- A.
  
  The time to find the value from HashMap with a Person key depends on the size of the map.
- B.
  
  Deleting a Person key from a HashMap will delete all map entries for all keys of type Person.
- C.
  
  Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate.
- D.
  
  The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
11.
- Given:
- 23. Object [] myObjects = {
- 24. new integer(12),
- 25. new String(”foo”),
- 26. new integer(5),
- 27. new Boolean(true)
- 28. };
- 29. Arrays.sort(myObjects);
- 30. for( int i=0; i
- 31. System.out.print(myObjects[i].toString());
- 32. System.out.print(” “);
- 33. }
- What is the result?
- A.
  
  Compilation fails due to an error in line 23.
- B.
  
  Compilation fails due to an error in line 29.
- C.
  
  A ClassCastException occurs in line 29.
- D.
  
  A ClassCastException occurs in line 31.
- E.
  
  The value of all four objects prints in natural order.
12.
- 12. Given:
- 13. public class Pass {
- 14. public static void main(String [1 args) {
- 15. int x 5;
- 16. Pass p = new Pass();
- 17. p.doStuff(x);
- 18. System.out.print(” main x = “+ x);
- 19. }
- 20.
- 21. void doStuff(int x) {
- 22. System.out.print(” doStuff x = “+ x++);
- 23. }
- 24. }
- What is the result?
- A.
  
  Compilation fails.
- B.
  
  An exception is thrown at runtime.
- C.
  
  doStuffx = 6 main x = 6
- D.
  
  DoStuffx = 5 main x = 5
- E.
  
  DoStuffx = 5 main x = 6
- F.
  
  doStuffx = 6 main x = 5
13.
- Given:
- 10. package com.sun.scjp;
- 11. public class Geodetics {
- 12. public static final double DIAMETER = 12756.32; // kilometers
- 13. }
- Which two correctly access the DIAMETER member of the Geodetics
- class? (Choose two.)
- A.
  
  import com.sun.scjp.Geodetics; public class TerraCarta { public double halfway() { return Geodetics.DIAMETER/2.0; } }
- B.
  
  Import static com.sun.scjp.Geodetics; public class TerraCarta { public double halfway() { return DIAMETER/2.0; } }
- C.
  
  import static com.sun.scjp.Geodetics. *; public class TerraCarta { public double halfway() { return DIAMETER/2.0; } }
- D.
  
  Package com.sun.scjp; public class TerraCarta { public double halfway() { return DIAMETER/2.0; } }
14.
- Given:
- 10. class Nav{
- 11. public enum Direction { NORTH, SOUTH, EAST, WEST }
- 12. }
- 13. public class Sprite{
- 14. // insert code here
- 15. }
- Which code, inserted at line 14, allows the Sprite class to compile?
- A.
  
  Direction d = NORTH;
- B.
  
  Nav.Direction d = NORTH;
- C.
  
  Direction d = Direction.NORTH;
- D.
  
  Nav.Direction d = Nav.Direction.NORTH;
15.
- Given:
- 10. interface Foo { int bar(); }
- 11. public class Sprite {
- 12. public int fubar( Foo foo) { return foo.bar(); }
- 13. public void testFoo() {
- 14. fubar(
- 15. // insert code here
- 16.);
- 17. }
- 18. }
- Which code, inserted at line 15, allows the class Sprite to compile?
- A.
  
  Foo { public int bar() { return 1; } }
- B.
  
  New Foo { public int bar() { return 1; } }
- C.
  
  NewFoo() { public int bar(){return 1; } }
- D.
  
  New class Foo { public int bar() { return 1; } }
16.
- Click the Exhibit button.
- 10. interface Foo {
- 11. int bar();
- 12. }
- 13.
- 14. public class Beta {
- 15.
- 16. class A implements Foo {
- 17. public int bar() { return 1; }
- 18. }
- 19.
- 20. public int fubar( Foo foo) { return foo.bar(); }
- 21.
- 22. public void testFoo() {
- 23.
- 24. class A implements Foo {
- 25. public int bar() { return 2; }
- 26. }
- 27.
- 28. System.out.println( fubar( new A()));
- 29. }
- 30.
- 31. public static void main( String[] argv) {
- 32. new Beta().testFoo();
- 33. }
- 34. }
- Which three statements are true? (Choose three.)
- A.
  
  Compilation fails.
- B.
  
  The code compiles and the output is 2.
- C.
  
  If lines 16, 17 and 18 were removed, compilation would fail.
- D.
  
  If lines 24, 25 and 26 were removed, compilation would fail.
- E.
  
  If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.
- F.
  
  If lines 24, 25 and 26 were removed, the code would compile and the output would be 1.
17.
- Given:
- 1. package sun.scjp;
- 2. public enum Color { RED, GREEN, BLUE }
- 1. package sun.beta;
- 2. // insert code here
- 3. public class Beta {
- 4. Color g = GREEN;
- 5. public static void main( String[] argv)
- 6. { System.out.println( GREEN); }
- 7. }
- The class Beta and the enum Color are in different packages.
- Which two code fragments, inserted individually at line 2 of the Beta
- declaration, will allow this code to compile? (Choose two.)
- A.
  
  import sun.scjp.Color.*;
- B.
  
  Import static sun.scjp.Color.*;
- C.
  
  Import sun.scjp.Color; import static sun.scjp.Color.*;
- D.
  
  Import sun.scjp.*; import static sun.scjp.Color.*;
- E.
  
  Import sun.scjp.Color; import static sun.scjp.Color.GREEN
18.
- Given:
- 1. public interface A {
- 2. String DEFAULT_GREETING = “Hello World”;
- 3. public void method1();
- 4. }
- A programmer wants to create an interface called B that has A as its
- parent. Which interface declaration is correct?
- A.
  
  public interface B extends A { }
- B.
  
  public interface B implements A {}
- C.
  
  Public interface B instanceOf A {}
- D.
  
  Public interface B inheritsFrom A { }
19.
- Given:
- 1. class TestA {
- 2. public void start() { System.out.println(”TestA”); }
- 3. }
- 4. public class TestB extends TestA {
- 5. public void start() { System.out.println(”TestB”); }
- 6. public static void main(String[] args) {
- 7. ((TestA)new TestB()).start();
- 8. }
- 9. }
- What is the result?
- A.
  
  TestA
- B.
  
  TestB
- C.
  
  Compilation fails.
- D.
  
  An exception is thrown at runtime.
20.
- Given:
- 1. interface TestA { String toString(); }
- 2. public class Test {
- 3. public static void main(String[] args) {
- 4. System.out.println(new TestA() {
- 5. public String toString() { return “test”; }
- 6. });
- 7. }
- 8. }
- What is the result?
- A.
  
  Test
- B.
  
  Null
- C.
  
  An exception is thrown at runtime.
- D.
  
  Compilation fails because of an error in line 1.
- E.
  
  Compilation fails because of an error in line 4.
- F.
  
  Compilation fails because of an error in line 5.
21.
- Question 21
- Given:
- 11. public abstract class Shape {
- 12. int x;
- 13. int y;
- 14. public abstract void draw();
- 15. public void setAnchor(int x, int y) {
- 16. this.x = x;
- 17. this.y = y;
- 18. }
- 19. }
- and a class Circle that extends and fully implements the Shape class.
- Which is correct?
- A.
  
  Shape s = new Shape(); s.setAnchor(10,10); s.draw();
- B.
  
  Circle c = new Shape(); c.setAnchor(10,10); c.draw();
- C.
  
  Shape s = new Circle(); s.setAnchor(10,10); s.draw();
- D.
  
  Shape s = new Circle(); s->setAnchor(10,10); s->draw();
- E.
  
  Circle c = new Circle(); c.Shape.setAnchor(10,10); c.Shape.draw();
22.
- Given:
- 10. abstract public class Employee {
- 11. protected abstract double getSalesAmount();
- 12. public double getCommision() {
- 13. return getSalesAmount() * 0.15;
- 14. }
- 15. }
- 16. class Sales extends Employee {
- 17. // insert method here
- 18. }
- Which two methods, inserted independently at line 17, correctly
- complete the Sales class? (Choose two.)
- .
- A.
  
  Double getSalesAmount() { return 1230.45; }
- B.
  
  Public double getSalesAmount() { return 1230.45; }
- C.
  
  private double getSalesAmount() { return 1230.45; }
- D.
  
  Protected double getSalesAmount() { return 1230.45; }
23.
- Given:
- 10. interface Data { public void load(); }
- 11. abstract class Info { public abstract void load(); }
- Which class correctly uses the Data interface and Info class?
- A
- A.
  
  public class Employee extends Info implements Data { public void load() { /*do something*/ } }
- B.
  
  S
- C.
  
  public class Employee implements Info extends Data { public void load() { /*do something*/ } } C. public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } }
- D.
  
  public class Employee implements Info extends Data { public void Data.load() { /*d something */ } public void load() { /*do something */ } }
- E.
  
  Public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } }
- F.
  
  . public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } }
24.
- Given:
- 11. public abstract class Shape {
- 12. private int x;
- 13. private int y;
- 14. public abstract void draw();
- 15. public void setAnchor(int x, int y) {
- 16. this.x = x;
- 17. this.y = y;
- 18. }
- 19. }
- Which two classes use the Shape class correctly? (Choose two.)
- A.
  
  public class Circle implements Shape { private int radius; }
- B.
  
  Public abstract class Circle extends Shape { private int radius; }
- C.
  
  public class Circle extends Shape { private int radius; public void draw(); }
- D.
  
  Blic abstract class Circle implements Shape { private int radius; public void draw(); }
- E.
  
  public class Circle extends Shape { private int radius; public void draw() {/* code here */} }
- F.
  
  Public abstract class Circle implements Shape { private int radius; public void draw() { / code here */ } }
25.

Which two classes correctly implement both the java.lang.Runnable and the java.lang.Clonable interfaces? (Choose two.)
- A.
  
  public class Session implements Runnable, Clonable { public void run(); public Object clone(); }
- B.
  
  . public class Session extends Runnable, Clonable { public void run() { / do something */ } public Object clone() { / make a copy */ } }
- C.
  
  . public class Session implements Runnable, Clonable { public void run() { / do something */ } public Object clone() { /* make a copy */ } }
- D.
  
  . public abstract class Session implements Runnable, Clonable { public void run() { / do something */ } public Object clone() { /*make a copy */ } }
- E.
  
  Public class Session implements Runnable, implements Clonable { public void run() { / do something */ } public Object clone() { / make a copy */ } }