Jjaavvaa
- 1.
Which declaration of the main method below would allow a class to be started as a standalone program. Select the one correct answer.
- A.
Public static int main(char args[])
- B.
Public static void main(String args[])
- C.
Public static void MAIN(String args[])
- D.
Public static void main(String args)
Correct Answer
B. Public static void main(String args[]) -
- 2.
What all gets printed when the following code is compiled and run? Select the three correct answers. public class xyz { public static void main(String args[]) { for(int i = 0; i < 2; i++) { for(int j = 2; j>= 0; j--) { if(i == j) break; System.out.println("i=" + i + " j="+j); } } } }
- A.
I=0 j=1
- B.
I=0 j=0
- C.
I=1 j=0
- D.
I=2 j=0
Correct Answer
A. I=0 j=1 -
- 3.
What gets printed when the following code is compiled and run with the following command - java test 2 Select the one correct answer. public class test { public static void main(String args[]) { Integer intObj=Integer.valueOf(args[args.length-1]); int i = intObj.intValue(); if(args.length > 1) System.out.println(i); if(args.length > 0) System.out.println(i - 1); else System.out.println(i - 2); } }
- A.
Test
- B.
Test -1
- C.
0
- D.
1
Correct Answer
D. 1 -
- 4.
- In Java technology what expression can be used to represent number of elements in an array named arr ?
- A.
Array.len
- B.
Arr.length
- C.
Len.arr
- D.
Arr.len
Correct Answer
B. Arr.length - 5.
Is the following statement true or false. The constructor of a class must not have a return type.
- A.
True
- B.
False
Correct Answer
A. True -
- 6.
Which of the following is a Java keyword. Select the four correct answers.
- A.
Extern
- B.
Synchronized
- C.
Volatile
- D.
Friend
- E.
Friendly
- F.
Transient
- G.
This
- H.
Then
Correct Answer(s)
B. Synchronized
C. Volatile
F. Transient
G. This -
- 7.
What is the number of bytes used by Java primitive long. Select the one correct answer
- A.
The number of bytes is compiler dependent
- B.
2
- C.
4
- D.
8
Correct Answer
D. 8 -
- 8.
Which of the following is correct? Select the correct answers.
- A.
The native keyword indicates that the method is implemented in another language like C/C++.
- B.
The only statements that can appear before an import statement in a Java file are comments.
- C.
The method definitions inside interfaces are not public and abstract. They cannot be private or protected.
- D.
A class constructor may have public or protected keyword before them, nothing else.
Correct Answer
A. The native keyword indicates that the method is implemented in another language like C/C++. -
- 9.
Which of the following are true. Select the one correct answers.
- A.
&& operator is used for short-circuited logical AND.
- B.
~ operator is the bit-wise XOR operator
- C.
| operator is used to perform bitwise OR and also short-circuited logical OR.
- D.
The unsigned right shift operator in Java is >>.
Correct Answer
A. && operator is used for short-circuited logical AND. -
- 10.
Name the access modifier which when used with a method, makes it available to all the classes in the same package and to all the subclasses of the class.
- A.
Private
- B.
Protected
- C.
Public
- D.
Default
Correct Answer
B. Protected -
- 11.
Which of the following is true. Select the two correct answers.
- A.
A class that is abstract may not be instantiated.
- B.
The final keyword indicates that the body of a method is to be found elsewhere. The code is written in non-Java language, typically in C/C++.
- C.
A static variable indicates there is only one copy of that variable.
- D.
A method defined as private indicates that it is accessible to all other classes in the same package.
Correct Answer(s)
A. A class that is abstract may not be instantiated.
C. A static variable indicates there is only one copy of that variable. -
- 12.
Which of these statements are true. Select the two correct answers.
- A.
For each try block there must be at least one catch block defined.
- B.
A try block may be followed by any number of finally blocks.
- C.
A try block must be followed by at least one finally or catch block.
- D.
If both catch and finally blocks are defined, catch block must precede the finally block.
Correct Answer(s)
C. A try block must be followed by at least one finally or catch block.
D. If both catch and finally blocks are defined, catch block must precede the finally block. -
- 13.
Which of these are core interfaces in the collection framework. Select the one correct answer.
- A.
Tree
- B.
Stack
- C.
Queue
- D.
Map
Correct Answer
D. Map -
- 14.
Name the keyword that makes a variable belong to a class, rather than being defined for each instance of the class. Select the one correct answer.
- A.
Static
- B.
Final
- C.
Native
- D.
Abstract
Correct Answer
A. Static -
- 15.
Which of the following are correct. Select the one correct answer.
- A.
An import statement, if defined, must always be the first non-comment statement of the file.
- B.
Private members are accessible to all classes in the same package
- C.
An abstract class can be declared as final.
- D.
Local variables cannot be declared as static
Correct Answer
D. Local variables cannot be declared as static -
- 16.
Select the one correct answer. Which method defined in Integer class can be used to convert an Integer object to primitive int type.
- A.
ValueOf
- B.
IntValue
- C.
GetInt
- D.
GetInteger
Correct Answer
B. IntValue -
- 17.
Select the one correct answer. The number of characters in an object of a class String is given by
- A.
The member variable called size
- B.
The member variable called length
- C.
The method size() returns the number of characters
- D.
The method length() returns the number of characters.
Correct Answer
D. The method length() returns the number of characters. -
- 18.
What is the result of compiling and running the following program. public class test { public static void main(String args[]) { String str1="abc"; String str2="def"; String str3=str1.concat(str2); str1.concat(str2); System.out.println(str1); } }
- A.
Abc
- B.
Acb
- C.
Bca
- D.
Cba
Correct Answer
A. Abc -
- 19.
Which of these classes defined in java.io and used for file-handling are abstract. Select the two correct answers.
- A.
InputStream
- B.
PrintStream
- C.
Reader
- D.
FileInputStream
Correct Answer(s)
A. InputStream
C. Reader -
- 20.
Is the following statement true or false. As the toString method is defined in the Object class, System.out.println can be used to print any object.
- A.
True
- B.
False
Correct Answer
A. True -
- 21.
What gets written on the screen when the following program is compiled and run. Select the one right answer. public class test { public static void main(String args[]) { int i; float f = 2.3f; double d = 2.7; i = ((int)Math.ceil(f)) * ((int)Math.round(d)); System.out.println(i); } }
- A.
4
- B.
5
- C.
6
- D.
9
Correct Answer
D. 9 -
- 22.
What is the return type of method round(double d) defined in Math class.
- A.
Long
- B.
Int
- C.
Short
- D.
Float
Correct Answer
A. Long -
- 23.
Assume that class A extends class B, which extends class C. Also all the three classes implement the method test(). How can a method in a class A invoke the test() method defined in class C (without creating a new instance of class C). Select the one correct answer.
- A.
C.test();
- B.
Super.test();
- C.
Super.super.test();
- D.
It is not possible to invoke test() method defined in C from a method in A.
Correct Answer
D. It is not possible to invoke test() method defined in C from a method in A. -
- 24.
Which of the following are true about interfaces. Select the one correct answers.
- A.
Methods declared in interfaces are implicitly private.
- B.
Variables declared in interfaces are implicitly public, static, and final.
- C.
An interface can not extend any number of interfaces.
- D.
The keyword implements indicate that an interface inherits from another.
Correct Answer
B. Variables declared in interfaces are implicitly public, static, and final. -
- 25.
In which all cases does an exception gets generated. Select the two correct answers. int i = 0, j = 1;
- A.
If((i == 0) || (j/i == 1))
- B.
If((i == 0) | (j/i == 1))
- C.
If((i != 0) && (j/i == 1))
- D.
If((i != 0) & (j/i == 1))
Correct Answer(s)
B. If((i == 0) | (j/i == 1))
D. If((i != 0) & (j/i == 1)) -
- 26.
If a base class has a method defined as void method() { } Which of the following are legal prototypes in a derived class of this class. Select the two correct answers.
- A.
Void method(;) { }
- B.
Int method() { return 0;}
- C.
Void method(int i) { }
- D.
Private void method() { }
Correct Answer
C. Void method(int i) { } -
- 27.
Which of the following statements related to Garbage Collection are correct. Select the two correct answers.
- A.
It is possible for a program to free memory at a given time.
- B.
Garbage Collection feature of Java ensures that the program never runs out of memory
- C.
It is possible for a program to make an object available for Garbage Collection.
- D.
The finalize method of an object is invoked before garbage collection is performed on the object.
Correct Answer(s)
C. It is possible for a program to make an object available for Garbage Collection.
D. The finalize method of an object is invoked before garbage collection is performed on the object. -
- 28.
String s = new String("xyz"); Assuming the above declaration, which of the following statements would compile. Select the one correct answer.
- A.
S = 2 * s;
- B.
Int i = s[0];
- C.
S = s + s;
- D.
S = s >> 2;
Correct Answer
C. S = s + s; -
- 29.
At what stage in the following method does the object initially referenced by s becomes available for garbage collection. Select the one correct answer. void method X() { String r = new String("abc"); String s = new String("abc"); r = r+1; //1 r = null; //2 s = s + r; //3 } //4
- A.
Before statement labeled 1
- B.
Before statement labeled 2
- C.
Before statement labeled 3
- D.
Before statement labeled 4
Correct Answer
D. Before statement labeled 4 -
- 30.
Which of the following are legal identifier names in Java. Select the two correct answers.
- A.
%abcd
- B.
$abcd
- C.
1abcd
- D.
Package
- E.
_a_long_name
Correct Answer(s)
B. $abcd
E. _a_long_name -
- 31.
Which of these is a legal definition of a method named m assuming it throws IOException, and returns void. Also assume that the method does not take any arguments. Select the one correct answer.
- A.
Void m() throws IOException{}
- B.
Void m() throw IOException{}
- C.
Void m(void) throws IOException{}
- D.
M() throws IOException{}
Correct Answer
A. Void m() throws IOException{} -
- 32.
What gets printed when the following code is compiled and run. Select the one correct answer. public class test { public static void main(String args[]) { int i = 1; do { i--; } while (i > 2); System.out.println(i); } }
- A.
0
- B.
1
- C.
2
- D.
-1
Correct Answer
A. 0 -
- 33.
How can you ensure that the memory allocated by an object is freed. Select the one correct answer.
- A.
By invoking the free method on the object.
- B.
By calling system.gc() method.
- C.
By setting all references to the object to new values (say null).
- D.
Garbage collection cannot be forced. The programmer cannot force the JVM to free the memory used by an object.
Correct Answer
D. Garbage collection cannot be forced. The programmer cannot force the JVM to free the memory used by an object. -
- 34.
What is the range of values that can be specified for an int. Select the one correct answer.
- A.
-231 to 231 - 1
- B.
-231-1 to 231
- C.
-215 to 215 - 1
- D.
-215-1 to 215
Correct Answer
A. -231 to 231 - 1 -
- 35.
Which of the following are legal array declarations. Select the three correct answers.
- A.
Int i[5][];
- B.
Int i[][];
- C.
Int []i[];
- D.
Int i[5][5];
- E.
Int[][] a;
Correct Answer(s)
B. Int i[][];
C. Int []i[];
E. Int[][] a; -
- 36.
What all gets printed when the following gets compiled and run. Select the two correct answers. public class test { public static void main(String args[]) { String s1 = "abc"; String s2 = new String("abc"); if(s1 == s2) System.out.println(1); else System.out.println(2); if(s1.equals(s2)) System.out.println(3); else System.out.println(4); } }
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer(s)
B. 2
C. 3 -
- 37.
What all gets printed when the following gets compiled and run. Select the two correct answers. public class test { public static void main(String args[]) { String s1 = "abc"; String s2 = "abc"; if(s1 == s2) System.out.println(1); else System.out.println(2); if(s1.equals(s2)) System.out.println(3); else System.out.println(4); } }
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer(s)
A. 1
C. 3 -
- 38.
What all gets printed when the following gets compiled and run. Select the three correct answers. public class test { public static void main(String args[]) { int i=1, j=1; try { i++; j--; if(i/j > 1) i++; } catch(ArithmeticException e) { System.out.println(0); } catch(ArrayIndexOutOfBoundsException e) { System.out.println(1); } catch(Exception e) { System.out.println(2); } finally { System.out.println(3); } System.out.println(4); } }
- A.
0
- B.
1
- C.
2
- D.
3
- E.
4
Correct Answer(s)
A. 0
D. 3
E. 4 -
- 39.
What all gets printed when the following program is compiled and run. Select the one correct answer. public class test { public static void main(String args[]) { int i=0, j=2; do { i=++i; j--; } while(j>0); System.out.println(i); } }
- A.
0
- B.
1
- C.
2
- D.
3
Correct Answer
C. 2 -
- 40.
What all gets printed when the following program is compiled and run. Select the two correct answers. public class test { public static void main(String args[]) { int i, j=1; i = (j>1)?2:1; switch(i) { case 0: System.out.println(0); break; case 1: System.out.println(1); case 2: System.out.println(2); break; case 3: System.out.println(3); break; } } }
- A.
0
- B.
1
- C.
2
- D.
3
Correct Answer(s)
B. 1
C. 2 -
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Mar 19, 2012Quiz Edited by
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