Fresher Drive @ 27th September Java
- 1.What will be the output?public class Test { static String a; static String b; public static void main(String ars[]){ System.out.print(a+b); }}
- A.
Null
- B.
Compile time error
- C.
Nullnull
- D.
0
- 2.You want a class to have access to members of another class in the same package. Which is the most restrictive access that accomplishes this objective?
- A.
Public
- B.
Private
- C.
Protected
- D.
Default access
- 3.Which is a valid declaration within an interface?
- A.
Public static short stop = 23
- B.
Protected short stop = 23
- C.
Transient short stop = 23
- D.
Final void madness(short stop)
- 4.What will be the output of the program?class Base{ Base() { System.out.print("Base"); }}public class Alpha extends Base{ public static void main(String[] args) { new Alpha(); new Base(); }}
- A.
Base
- B.
BaseBase
- C.
Compilation fails
- D.
The code runs with no output
- 5.What will be the output of the program?class Equals public static void main(String [] args) { int x = 100; double y = 100.1; boolean b = (x = y); System.out.println(b); }
- A.
True
- B.
False
- C.
Compilation fails
- D.
An exception is thrown at runtime
- 6.What will be the output of the program?for(int i = 0; i < 3; i++){ switch(i) { case 0: break; case 1: System.out.print("one "); case 2: System.out.print("two "); case 3: System.out.print("three "); }System.out.printIn("done");
- A.
Done
- B.
One two done
- C.
One two three done
- D.
One two three two three done
- 7.Which is a valid keyword in java?
- A.
Interface
- B.
String
- C.
Float
- D.
Unsigned
- 8.Which method must be defined by a class implementing the java.lang.Runnable interface?
- A.
Void run()
- B.
Public void run()
- C.
Public void start()
- D.
Void run(int priority)
- 9.Which interface does java.util.Hashtable implement?
- A.
Java.util.Map
- B.
Java.util.List
- C.
Java.util.HashTable
- D.
Java.util.Collection
- 10.Which class cannot be a subclass in java?
- A.
Abstract class
- B.
Parent class
- C.
Final class
- D.
None of above
- 11.Why we use array as a parameter of main method?
- A.
It is syntax
- B.
Can store multiple values
- C.
Both of above
- D.
None of above
- 12.What will be the output of the program?public class Foo{ public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } }}
- A.
Finally
- B.
Compilation fails
- C.
The code runs with no output
- D.
An exception is thrown at runtime
- 13.Which statement is true about a static nested class?
- A.
You must have a reference to an instance of the enclosing class in order to instantiate it
- B.
It does not have access to nonstatic members of the enclosing class
- C.
It's variables and methods must be static
- D.
It must extend the enclosing class
- 14.Which three are methods of the Object class? notify(); notifyAll(); isInterrupted(); synchronized(); interrupt(); wait(long msecs); sleep(long msecs); yield();
- A.
1, 2, 4
- B.
2, 4, 5
- C.
1, 2, 6
- D.
2, 3, 4
- 15.Which cause a compiler error?
- A.
Int[ ] scores = {3, 5, 7};
- B.
Int [ ][ ] scores = {2,7,6}, {9,3,45};
- C.
String cats[ ] = {"Fluffy", "Spot", "Zeus"};
- D.
Boolean results[ ] = new boolean [] {true, false, true};
- E.
Integer results[ ] = {new Integer(3), new Integer(5), new Integer(8)};
- 16.Which method executes only once?
- A.
Start() method
- B.
Init() method
- C.
Stop() method
- D.
Destroy() method
- 17.Which is a valid keyword in java?
- A.
Interface
- B.
String
- C.
Float
- D.
Unsigned
- 18.Which class cannot be a subclass in java?
- A.
Abstract class
- B.
Parent class
- C.
Final class
- D.
None of above
- 19.What will be the output of the program?public class Foo{ public static void main(String[] args) { try { return; } finally { System.out.println( "Finally" ); } }}
- A.
Finally
- B.
Compilation fails
- C.
The code runs with no output
- D.
An exception is thrown at runtime
- 20.Which statement is true about a static nested class?
- A.
You must have a reference to an instance of the enclosing class in order to instantiate it.
- B.
It does not have access to nonstatic members of the enclosing class
- C.
It's variables and methods must be static
- D.
It must extend the enclosing class
- 21.Which cause a compiler error?
- A.
Int[ ] scores = {3, 5, 7};
- B.
Int [ ][ ] scores = {2,7,6}, {9,3,45};
- C.
String cats[ ] = {"Fluffy", "Spot", "Zeus"};
- D.
Boolean results[ ] = new boolean [] {true, false, true};
- E.
Integer results[ ] = {new Integer(3), new Integer(5), new Integer(8)};
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