Which component is used to compile, debug and execute a program?
Anonymous Quiz
50%
JVM
31%
JDK
8%
JIT
12%
JRE
How to remove duplicates from List?
Anonymous Quiz
37%
HashSet<String> listToSet = new HashSet<String>(duplicateList);
24%
HashSet<String> listToSet = duplicateList.toSet();
27%
HashSet<String> listToSet = Collections.convertToSet(duplicateList);
12%
HashSet<String> listToSet = duplicateList.getSet();
Which of the following is a correct way of inheriting class A by class B?
Anonymous Quiz
6%
class B + class A{ }
21%
class B inherits class A{ }
49%
class B extends A{ }
25%
class B extends class A{ }
Which of these is super Class of wrappers Double & Integer?
Anonymous Quiz
26%
Long
13%
Digits
26%
Float
36%
Number
which concept of java is a way of converting real world objects in terms of class?
Anonymous Quiz
38%
Polymorphism
16%
Inheritance
22%
Abstraction
25%
Encapsulation
What will be the output of the following code snippet?
class A{ } enum Enums extends A{ ABC,BCD,CDE,DEF; }
class A{ } enum Enums extends A{ ABC,BCD,CDE,DEF; }
Anonymous Quiz
15%
Runtime Error
21%
Compile time Error
34%
It runs successfully
30%
EnumNotDefinedException
What will be the output of the following Java code?
enum Season
{ WINTER, SPRING, SUMMER, FALL }; System.out.println(Season.WINTER.ordinal());
enum Season
{ WINTER, SPRING, SUMMER, FALL }; System.out.println(Season.WINTER.ordinal());
Anonymous Quiz
42%
0
40%
1
17%
2
0%
3
What is the difference between length() and size() of ArrayList?
Anonymous Quiz
19%
length() and size() return the same value
24%
length() is not defined in ArrayList
10%
size() is not defined in ArrayList
47%
length() returns capacity of ArrayList and size() returns actual number of elements stored in list
public class Program
{
public static void main(String[] args) { String s="I LIKE JAVA"; System.out.println(s.charAt(3)); } }
{
public static void main(String[] args) { String s="I LIKE JAVA"; System.out.println(s.charAt(3)); } }
Anonymous Quiz
42%
I
34%
L
22%
K
3%
E
The "all-or-none" property commonly known as
Anonymous Quiz
22%
Isolation
11%
Durability
30%
Atomicity
37%
All the above
When an array is passed to a method, will the content of the array undergo changes with the actions carried within the function?
Anonymous Quiz
70%
True
30%
False
public class VarArgs
{
public static void print(Object... obj){
System.out.println("Object...:"+obj[0]);
}
public static void main(String[] args) {
//(1) Method call here)
}
}
Which Method call, when inserted at (1), will not result in the following output from the program:
Object...: 9
{
public static void print(Object... obj){
System.out.println("Object...:"+obj[0]);
}
public static void main(String[] args) {
//(1) Method call here)
}
}
Which Method call, when inserted at (1), will not result in the following output from the program:
Object...: 9
Given the following declaration, which expression return the size of the array, assuming the array has been initialized? Select the one correct answer.
int[] array;
int[] array;
Anonymous Quiz
24%
array[].length()
14%
array.length()
17%
array[].length
26%
array.length
5%
array[].size()
14%
array.size()
Given the following code which statement is true?
public class Program
{
public static void main(String[] args) {
int k=0;
int l=0;
for(int i=0;i<=3;i++){
k++;
if(i==2){
break;
}
l++;
}
System.out.println(k+" "+l);
}
}
public class Program
{
public static void main(String[] args) {
int k=0;
int l=0;
for(int i=0;i<=3;i++){
k++;
if(i==2){
break;
}
l++;
}
System.out.println(k+" "+l);
}
}
Options for above question
Anonymous Quiz
10%
The Program will fail to compile
22%
The Program will print 3 3 , when run
42%
The Program will print 4 3 ,when run, if break is replaced by continue
18%
The Program will fail to compile of break is replaced by return
8%
The Program will fail to compile of break is replaced by empty statement
How to use the Throws keyword in Java (and when to use Throw)
https://rollbar.com/blog/how-to-use-the-throws-keyword-in-java/
https://rollbar.com/blog/how-to-use-the-throws-keyword-in-java/
Rollbar
How to use the Throws keyword in Java (and when to use Throw)
Both throw and throws are concepts of exception handling in Java. The throws keyword is used to ..., while the throw keyword is used to explicitly...
Learn Java by building a classic arcade game | Opensource.com
https://opensource.com/article/21/3/java-object-orientation
https://opensource.com/article/21/3/java-object-orientation
Opensource
Learn Java by building a classic arcade game
As a second-semester student in systems and digital media at the Federal University of Ceará in Brazil, I was given the assignment to remake the classic Atari 2600
Consider the following Java Interface:
interface Pet{
void play();
} Suppose we want to code the Dog class, which is not an abstract class, and implement the pet interface. Which of the following actions needs to be performed in the given scenario? Choose the best options: A) Declare the Dog class to extend the Pet interface and override the abstract method play. B) State "Dog implements Pet" in the class declaration. The play method is automatically inherited from the pet interface. C) State "Dog implements Pet" in the class declaration and provides an implementation for the play method in the code of Dog class. D) Implement the play method in the Dog class. The Java compiler automatically deduces that the class Dog implements the corresponding interface.
interface Pet{
void play();
} Suppose we want to code the Dog class, which is not an abstract class, and implement the pet interface. Which of the following actions needs to be performed in the given scenario? Choose the best options: A) Declare the Dog class to extend the Pet interface and override the abstract method play. B) State "Dog implements Pet" in the class declaration. The play method is automatically inherited from the pet interface. C) State "Dog implements Pet" in the class declaration and provides an implementation for the play method in the code of Dog class. D) Implement the play method in the Dog class. The Java compiler automatically deduces that the class Dog implements the corresponding interface.