Online Test On OOP Using Java
No Negative marking Attempt questions as many you can
- 1.Following code will result in: int a = 3.5;
- A.
Compilation error
- B.
Runtime error
- 2.Following code will result in: int a1 = 5; double a2 = (float)a1;
- A.
Runtime error
- B.
No errors
- 3.Following code will result in: int a = 9/0;
- A.
Compilation error: Divisions must be in a try block.
- B.
Runtime Exception
- 4.Following code will result in: float a = 9/0
- A.
Compilation error: DivideByZeroException
- B.
Runtime Exception
- 5.A class can be transient
- A.
True
- B.
False
- 6.Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}
- A.
Compilation error
- B.
Runtime Error
- 7.Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
- A.
Compile error
- B.
No error
- 8.Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}
- A.
Runtime Exception
- B.
No errors
- 9.Methods that are marked protected can be called in any subclass of that class.
- A.
True
- B.
False
- 10.An abstract class can have non-abstract methods
- A.
True
- B.
False
- 11.Java keywords are written in lowercase as well as uppercase
- A.
True
- B.
False
- 12.What is an instanceof
- A.
A methods in object
- B.
An operator and keyword
- 13.Primitive datatypes are allocated on a stack
- A.
True
- B.
False
- 14.Can you compare a boolean to an integer?
- A.
Yes
- B.
No
- 15.If class A implements an interface does it need to implement all methods of that interface?
- A.
Yes, always
- B.
No, not when A is abstract
- 16.Integer a = new Integer(2); Integer b = new Integer(2); What happens when you do if (a==b)?
- A.
True
- B.
FALSE
- 17.The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.
- A.
True
- B.
False
- 18.Inner classes can be defined within methods
- A.
True
- B.
False
- 19.Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.
- A.
True
- B.
False
- 20.The default statement of a switch is always executed
- A.
True
- B.
False
- 21.How can you prevent a member variable from becoming serialized?
- A.
By marking it volatile
- B.
By marking it transient
- 22.What is Java (in regard to Computer Science) ?
- A.
A type of coffee
- B.
AN OBJECT-ORIENTED PROGRAMMING LANGUAGE
- 23.WHAT IS AN APPLET?
- A.
A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER
- B.
A type of coffee
- 24.Java runs on _______.
- A.
Windows
- B.
All of the Above
- C.
Unix/Linux
- 25.Why can't the whole program just consist of the one line that does the painting ?
- A.
In Java, to create an applet, you can't call on functions without defining a class to call them.
- B.
The drawString function is not defined without the "import" statements at the top.
- C.
All of the above.
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