Java Junior
It is created for Beginners in Java. This is to test the knowledge of any Java Developer wannabe.
- 1.If none of the private/protected/public is specified for a member, that member ...
- A.
Is accessible publicly
- B.
Is only accessible by other classes of the same package
- C.
Is only accessible from within the class
- D.
Is accessible by the class and its subclasses
- 2.Which one is not correct?
- A.
A class needs to be instantiated as an object before being used
- B.
An objects exists in memory in run time
- C.
Class and object are just different names for the same thing
- D.
An object is a variable, where its type is the class used to declare the variable
- 3.Which is not a part of defining an object?
- A.
Description
- B.
Methods
- C.
Associations with other objects
- D.
Name
- 4.Class B inherits from Class A, what cannot be said:
- A.
B is a sub-class of A
- B.
A is a super-class of B
- C.
B has access to private members of A
- D.
B has access to protected members of A
- 5.What is a member of a class
- A.
An attribute
- B.
A method
- C.
Attribute or method
- D.
A sub-class
- 6.A class is...
- A.
An object
- B.
An executable piece of code
- C.
An abstract definition of an object
- D.
A varibale
- 7.Which package do you need to use widgets such as JApplet, JFrame, JPanel and JButton?
- A.
Javax.swing
- B.
Javax.gui
- C.
Java.awt
- D.
Java.swing
- 8.Which one needs a web page to run
- A.
A Java Application
- B.
A Java Stand-Alone Application
- C.
A Java Applet
- D.
A Java Class
- 9.How to define a JButton with the caption test?
- A.
JButton aButton('test');
- B.
JButton aButton=new JButton("test");
- C.
JButton aButton=new JButton('test');
- D.
JButton("test") aButton;
- 10.The last value in an array called ar can be found at index:
- A.
0
- B.
1
- C.
Ar.length
- D.
Ar.length - 1
- 11.What would display from the following statements? int [ ] nums = {1,2,3,4,5,6}; System.out.println((nums[1] + nums[3]));
- A.
6
- B.
2+4
- C.
1+3
- D.
4
- 12.What loop will display each of the numbers in this array on a separate line: float [ ] nums= {1.1f, 2.2f, 3.3f};
- A.
For (int i =0; i < 3; i++) System.out.println( nums[i]);
- B.
For (i = 1; i
- C.
For (i = 0; i
- D.
For (i = 1; i < 3; i++) System.out.println(nums[i]);
- 13.What displays from the following statements? String word = "abcde"; for (int i = 0; i <4; i+=2) System.out.print(word[i]);
- A.
Ab
- B.
Ac
- C.
Ace
- D.
Bd
- 14.If we declare int [ ] ar = {1,2,3,4,5,6}; The size of array ar is:
- A.
0
- B.
5
- C.
6
- D.
7
- 15.The following prototype shows that a Cylinder subclass is derived from a superclass called Circle
- A.
Class Circle extends Cylinder
- B.
Class Cylinder derived Circle
- C.
Class Cylinder extends Circle
- D.
Class Circle derived Cylinder
- 16.With inheritance, a derived subclass object can directly access any
- A.
Public or private superclass member
- B.
Private superclass member
- C.
Public superclass member (and protected subclass members if it's in the same package)
- D.
Protected, public or private superclass member
- 17.What is the role of the constructor?
- A.
Create an instance of a class (an object)
- B.
Create names for methods
- C.
To create some type of change in the state of an object
- 18.A class cannot be declared:
- A.
Static
- B.
Private
- C.
Protected
- 19.Following code will result in: int num = 6.7;
- A.
Compilation error
- B.
Runtime error
- C.
Num being 6.7
- D.
Num being 6
- 20.Following code will result in: int a1 = 5; double a2 = (float)a1;
- A.
Compilation error
- B.
Runtime error
- C.
No errors
- D.
Runtime Exception
- 21.Following code will result in: int num = 8/0;
- A.
Compilation error: Divisions must be in a try block
- B.
Compilation error: DivideByZeroException
- C.
Runtime Exception
- D.
No Error: a is NaN
- 22.Following code will result in: float num = 5/0;
- A.
Compilation error: Divisions must be in a try block
- B.
Compilation error: DivideByZeroException
- C.
Runtime Exception
- D.
No Error: a is NaN
- 23.A class can be transient
- A.
True
- B.
False
- 24.Following code will result in: class A { int x = 1; public static void main(String [] args) { System.out.println("x is " + x); }}
- A.
Compilation error
- B.
Runtime Error
- C.
Runtime Exception
- D.
Output of x is 1
- 25.Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}
- A.
Compile error
- B.
Runtime Exception
- C.
No error
- D.
No Output
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