Ctd Techs Java Assessment Test
.
- 1.What is the data type for the number 9.6352?
- A.
float
- B.
Double
- C.
Float
- D.
Double
- 2.What is the meaning of the return data type void?
- A.
An empty memory space is returned so that the developers can utilize it.
- B.
Void returns no data type.
- C.
Void is not supported in Java.
- D.
None of the above.
- 3.Java object oriented programming concepts is/are
- A.
Encapsulation
- B.
Inheritance
- C.
Polymorphism
- D.
All of the above.
- 4.False statement about final method in java
- A.
Value of final variable cannot be changed once initialized.
- B.
Final method is inherited but we cannot override it
- C.
If you make a class final then you cannot extend the class
- D.
Constructor can be declared as final.
- 5.Which method is called internally by Thread start() method?
- A.
Execute()
- B.
Run()
- C.
Launch()
- D.
Main()
- 6.A java interface can contain ————
- A.
Public static Final Variables only
- B.
Public Abstract methods
- C.
Abstract methods(unimplemented) and implemented methods both
- D.
Public static Final Variables and abstract methods both
- 7.Which is the correct way to inherit and implement the interface? Consider and example, Interface is IAnimal and a class is Cat that wants to implement interface.
- A.
Class Cat implements IAnimal{}
- B.
Class Cat extends IAnimal{}
- C.
Class Cat import IAnimal{}
- D.
None is correct
- 8.Which of the following is true about methods in an interface in java?
- A.
An interface can contain only abstract method.
- B.
We can define a method in an interface
- C.
Private and protected access modifiers can also be used to declare methods in interface
- D.
None
- 9.Which is correct option about java interface?
- A.
Interface is used to achieve multiple inheritance in java
- B.
Object of an interface cannot be created.
- C.
An interface can extend another interface.
- D.
All of the above
- 10.Which is true statements about an interface in java?
- A.
An interface can extend another interface
- B.
We can create object of an interface in java
- C.
An interface can have constructor
- D.
None
- 11.Which polymorphism behavior do you see in below class? class Paint { // all methods have same name public void Color(int x) { } public void Color(int x, int y) { } public void Color(int x, int y, int z) { } }
- A.
Method overloading
- B.
Constructor overloading
- C.
Method overriding
- D.
Run time polymorphism
- 12.In below java code, whose “Car” will be called? class Father { public void car() { System.out.println("Father's Car"); } } class Son extends Father { public void car() { System.out.println("Son's Car"); } } public class Sample { public static void main(String[] args) { Son john = new Son(); john.car(); } }
- A.
Father’s Car
- B.
Son’s Car
- C.
There is an ambiguity, so no one Car
- D.
Compiler Error
- 13.Number of threads in below java program is public class ThreadExtended extends Thread { public void run() { System.out.println("\nThread is running now\n"); } public static void main(String[] args) { ThreadExtended threadE = new ThreadExtended(); threadE.start(); } }
- A.
0
- B.
1
- C.
2
- D.
3
- 14.Which thread will be executed first if two threads have same priority
- A.
They will fall in starvation and none will be executed.
- B.
Both will be executed simultaneously
- C.
It depends upon operating system
- D.
They will be executed on first come first serve basis
- 15.In what memory area, variable temp and variable card written in main () get stored? class CreditCard{ int num; } public class Bank { public static void main(String[] args) { int temp; CreditCard card; } }
- A.
Heap, Heap
- B.
Stack, stack
- C.
Heap, Stack
- D.
Stack, Heap
- 16.What exception can occur in the below java program if we access 5 element in the array that does not exist? public class TException { public static void main(String[] args) { try { int a[] = { 5, 10, 15, 20 }; System.out.println("Element :" + a[4]); } finally{} } }
- A.
ArrayIndexOutOfBoundsException
- B.
ArithmeticException
- C.
NullPointerException
- D.
None
- 17.Direct subclass of Throwable in Java
- A.
Exception
- B.
Error
- C.
Both A & C
- D.
None
- 18.Garbage collection in Java is
- A.
Unused package in a program automatically gets deleted.
- B.
Memory occupied by objects with no reference is automatically reclaimed for deletion.
- C.
Java deletes all unused java files on the system.
- D.
The JVM cleans output of Java program.
- 19.True statements about object of Insurance class is/are class Insurance{ int policyNumber; } public class Bank { public static void main(String[] args) { Insurance policy = new Insurance(); } }
- A.
Class object will be garbage collected when it goes out of scope from main ()
- B.
In the middle of main () function, class object can also be set for garbage collection by using statement “policy = NULL;”
- C.
Both A & B are true
- D.
None
- 20.____________ provides run time environment for java byte code to be executed
- A.
JDK
- B.
JRE
- C.
JVM
- D.
JAVAC
- 21.What is output of this java program? public class MemoryJava { public static void main(String[] args) { decreaseNumberbyOne(2); } public static void decreaseNumberbyOne(int num){ if(num >= 0){ decreaseNumberbyOne(num -1); } System.out.println("Number:"+num); } }
- A.
-1,0,1,2
- B.
2,1,0,-1
- C.
Stack overflow
- D.
No output
- 22.__________ can be used to control the order of certain data structure and collection of objects too.
- A.
Serial Comparators.
- B.
Natural Comparators.
- C.
Comparators.
- D.
All of above.
- 23.After the following code fragment, what is the value in fname? String str; int fname; str = “Foolish boy.”; fname = str.indexOf(“fool”);
- A.
0
- B.
2
- C.
-1
- D.
4
- 24.Given the following code snippet; int salaries[]; int index = 0; salaries = new int salaries[4]; while (index < 4) { salaries[index] = 10000; index++; } What is the value of salaries[3]?
- A.
40000
- B.
50000
- C.
15000
- D.
10000
- 25.What is the value of number after the following code fragment execution? int number = 0; int number2 = 12; while (number < number2) { number = number + 1; }
- A.
5
- B.
12
- C.
21
- D.
13
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