Java Pool Bit Meerut
Testing java by online exam
- 1.What is java ?
- A.
Oop language
- B.
Structure language
- C.
Procedural language
- D.
Application language
- E.
Software devlopment language
- 2.Which of these is a keyword in java?
- A.
Goto
- B.
Enum
- C.
Switch
- D.
Class
- E.
Critical
- 3.Which is legal identifier name?
- A.
Int __;
- B.
Int $_1;
- C.
Int 123;
- D.
Int a*g;
- E.
Int th_is;
- 4."Tiger" is used to denote which version of java?
- A.
Java 5.0
- B.
Java 6.0
- C.
Java 1.1
- D.
Java 1.0
- E.
Java 2.0
- 5.Which one of these is primitive datatype in java?
- A.
Int
- B.
Boolean
- C.
Short
- D.
Long
- E.
Float
- 6.Try{int x=Integer.parseInt("two");}what type of exceptions can be caugth in catch block?
- A.
IllegalStateException
- B.
IllegalArgumentException
- C.
NumberFormatException
- D.
IllegalMonitorStateException
- E.
ArrayIndexOutOfBoundException
- 7.Class A{static void sing(){System.out.print("fa");}}class B extends A{static void sing(){System.out.print("la";)}public static void main(String[] args){A one=new B();B two=new B();System.out.print(one.sing()+""+two.sing());}}}what is the result?
- A.
Fa la
- B.
La fa
- C.
Fa fa
- D.
La la
- E.
Compilation fails
- 8.Class Top{Top(String s){System.out.println("Hello");}}class Bottom extends Top{Bottom(String t){}public static void main(String[] args){new Bottom("BIT"); }}what is the result?
- A.
Hello
- B.
No output is generated
- C.
An Exception is thrown at run time
- D.
Compilation fail
- E.
None of above
- 9.Class Alpha{int over=1;}class Beta extends Alpha{int over=2; }class Gamma extends Beta{int over=3;public static void main(String[] args){new Gamma().go();}void go(){Beta b=new Gamma();Alpha a=new Gamma();System.out.println(super.over+""+b.over+""+a.over);}}what is the result?
- A.
221
- B.
321
- C.
233
- D.
333
- E.
Compilation fails
- 10.Public class Switch2{public static short x=1;staticfinal int y=3;public static void main(String[] args){for(int z=3;z>0;--z){switch(z){case y:System.out.print("0");case y-1:System.out.print("1");case x:z--;}}}}what is the result?
- A.
01
- B.
012
- C.
Compilation fails at line 7
- D.
Compilation fails at line 8
- E.
Compilation fails at line 9
- 11.Class Zeta{public static void main(String[] args){int x=1;if((4>x)^((++x + 2)>3)) x++;if((4 > ++x)^(++x==5)) x++;System.out.print(x);}}what is the result?
- A.
2
- B.
3
- C.
4
- D.
5
- E.
Compilation fails
- 12.Which are true?
- A.
A static method cannot be synchronized.
- B.
If a class has synchronized code,multiple threads can still access the non-synchronized code.
- C.
Variables can be marked synchronized
- D.
When a thread sleeps,it releases its locks
- E.
When a thread invockes wait(),it releases its locks
- 13.Public class MyProgram{public static void main(String[] args){try{ System.out.print("Hello World");}finally{System.out.println("Finally executing");}}}what is the result?
- A.
Compilation fails
- B.
Exception
- C.
Hello world
- D.
Hello world Finally executing
- E.
Finally executing Hello world
- 14.Class Alpha{int doStuff(float b){return 7;}}class Beta extends Alha{//insert code here}which,inserted independently at line 8,will compile?
- A.
Private int doStuff(float y){return 4;}
- B.
Protected int doStuff(float y){return 4;}
- C.
Public Integer doStuff(float y){return 4;}
- D.
Final int doStuff(float y){return 4;}
- E.
Public long doStuff(float y){return 4;}
- 15.Class Silky extends Smooth{int x=5;int y=7;public static void main(String[] args){new Silky().go();}void go(){if(x>y & (Boolean)(this instanceof Silky)) System.out.print("a");if(Long.valueOf(4) instanceof Number) System.out.print("b");}}class Smooth{}what is the result?
- A.
A
- B.
B
- C.
Ab
- D.
Compilation fails
- E.
An exception is thrown at runtime
- 16.Which are true?
- A.
Encapsulation limits the consequences of change.
- B.
Encapsulation makes it easier to reuse classes.
- C.
Encapsulation results in better testing and higher reliability.
- D.
Encapsulation means that methods are all public.
- E.
Encapsulation means that classes are members of packages.
- 17.Class X{void go(){System.out.print("x");}}class Y extends X{void go(){System.out.print("y");}}class Z extends X{void go(){System.out.print("z");}}class Chrome1{public static void main(String[] args){X z=new Z();X y=new Y();Z y2=(Z)y;y.go();y2.go();}}what is the result?
- A.
Xxx
- B.
Xxz
- C.
Zyy
- D.
Zyz
- E.
An exception is thrown at runtime
- 18.Public class Felix{ protected long cat(){return 7L;}}class Oscar extends Felix{//insert code here} which method inserted ,will compile?
- A.
Private long cat(int x){return 7;}
- B.
Public long cat(){return 7;}
- C.
Long cat(){return 7;}
- D.
Protected int cat(int x){return 7;}
- E.
None of these
- 19.Which of the following are legal definitions for non-nested classes and interfaces?
- A.
Static public interface Foo{}
- B.
Abstract public class Foo{}
- C.
Protected interface Foo{}
- D.
Final abstract class Foo{}
- E.
Final public class Foo{}
- 20.Public class Switch2{public static void main(String[] args){int y=0;for(int x=3;x>=0;x--){switch(x){case 3:y=y+100;case 2:y=y+10;case 1:break;case 0:y=y+1;}}System.out.println(y);}}what is the result?
- A.
120
- B.
121
- C.
122
- D.
123
- E.
Compilation fails
- 21.Public static void main(String[] args){TreeSet<Number> tree=new TreeSet<Number>();tree.add(108);//insert here}which is inserted to compile and run
- A.
Tree.add(3.14);
- B.
Tree.add("42");
- C.
Tree.add(Integer.valueOf("-1"));
- D.
Tree.add(null);
- E.
Tree.add(0xCAFE)
- 22.Calss Bulbs{ enum Turn{ ON("bright"),OFF("dark");}public staticmvoid main(String[] args){ System.out.println(Turn.ON);}}what is the result?
- A.
ON
- B.
Bright
- C.
Compilation fails
- D.
No output is produced
- E.
Exception
- 23.Which is true?
- A.
It is not good practice to place assertions where you think execution should never reach.
- B.
It is sometimes appropriate to call getters and setters from assertions.
- C.
Use assertions to verify the arguments of private methods.
- D.
Assertions can be disabled for a particular class
- E.
Never throw an AssertionError explicitly
- 24.Class Battery{static int x=1;public static void main(String[] args) throws Throwable{try{if(x==1)throw new Throwable();System.out.println("try");}catch(Exception e){System.out.println("exc");}finally{System.out.println("fin");}}}what is the result?
- A.
Try
- B.
Try fin
- C.
Exc fin
- D.
Fin then a runtime exception
- E.
Compilation fails
- 25.Which of the following can be constructed using a String?
- A.
Java.io.File
- B.
Java.io.FileWriter
- C.
Java.io.PrintWriter
- D.
Java.io.FileReader
- E.
Java.io.BufferedWriter
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