Java Paper - 4
- 1.Which of the following are valid inside a class?
- protected abstract void display();
- static final void display(){}
- public synchronized final void display() {}
- private native void display1();
- A.
1 and 3
- B.
2 and 4
- C.
1 only
- D.
All
- 2.To compile any source java file, which of the following must be true.
- A.
It should have default package statement
- B.
file extension must be .java
- C.
File extension must be .Java
- D.
It should have public static void main().
- 3.Public interface Value { String value = 4; }What is following is true about “value” inside interface.1. final String value = 4; 2. public String value = 4; 3. abstract String value = 4; 4. volatile String value = 4; 5. protected String value = 4;
- A.
1, 2
- B.
1, 3
- C.
2, 4
- D.
4, 5
- 4.What will be the output of the program? public class ArrayCopy { public static void main(String [] args) { ArrayCopy arrayCopy = new ArrayCopy(); arrayCopy.display(); } void display() { long [] array1 = {3,4,5}; long [] array2 = arrayPrint(array1); System.out.print(array1 [0] + array1 [1] + array1 [2] + " "); System.out.println(array2 [0] + array2 [1] + array2 [2]); } long [] arrayPrint(long [] a3) { a3[1] = 6; return a3; }}
- A.
12, 14
- B.
14, 14
- C.
3 4 5 3 6 5
- D.
3 6 5 3 6 5
- 5.What will be the output of the program?public class IntegerEqual{ public static void main(String [] args) { int a = 100; Integer b = new Integer("100"); boolean c = (a == b); System.out.println(c); }}
- A.
True
- B.
False
- C.
Compilation fails
- D.
An exception is thrown at runtime
- 6.What will be the output of the program? public class LeftShift { public static void main(String [] args) { int a = 4; a = a << 2; System.out.println("a = " + a); }}
- A.
2
- B.
4
- C.
8
- D.
16
- 7.What will be the output of the program?public class Test { public static void main(String[] args) { try { int i = 0; int j = j / i; } catch (Exception e) { System.out.println("Exception"); } catch (ArithmeticException ae) { System.out.println(" Arithmetic Exception"); } System.out.println("finished"); } }
- A.
Finished
- B.
Exception
- C.
Compilation fails.
- D.
Arithmetic Exception
- 8.What will be the output of the program? public class PrintTest { public static void main(String [] args) { try { System.out.print("X"); } catch (Exception ex) { System.out.print("Y"); } finally { System.out.print("Z"); } System.out.print("?"); } public static void doNothing() throws RuntimeException{ try { } catch(Exception e) { throw new printException(); } } class printException extends RuntimeException { private static final long serialVersionUID = 1L; }}
- A.
XY?
- B.
XZ?
- C.
XYZ?
- D.
YZ?
- 9.Which collection class allows you to grow or shrink its size?
- A.
Java.util.HashSet
- B.
Java.util.LinkedHashSet
- C.
Java.util.LinkList
- D.
Java.util.ArrayList
- 10.Which constructs an anonymous inner class instance?
- A.
Runnable r = new Runnable() { };
- B.
Runnable r = new Runnable(public void run() { });
- C.
Runnable r = new Runnable { public void run(){}};
- D.
System.out.println(new Runnable() {public void run() { }});
- 11.Which one of following option will not stop thread execution?
- A.
SetPriority() method on a Thread object.
- B.
Wait() method on an object.
- C.
Read() method on an InputStream object.
- D.
Calling read() method on an InputStream object
- 12.Void testObject() { class1 object1 = new class1 (); class2 object2 = new class2 (); object1.s(object2); object2 = null; object1 = null; System.out.println("start completed");}When the class2 object, will be eligible for garbage collection?
- A.
After line 5
- B.
After line 6
- C.
After line 7
- D.
None of the above
- 13.What is will be output of following programpublic class TestFinal { private final int a = 10; private static final int b; private final int c; { b = 20; } TestFinal() { c = 30; } public static void main(String[] args) { System.out.println("a " + a); System.out.println("a " + b); System.out.println("a " + c); }}
- A.
10 20 30
- B.
10 0 30
- C.
Compilation error
- D.
10 Garbage value 30
- 14.What will be the output of the program? public class Test { public static void main(String[] args) { int x = 0; assert (x > 0) ? true : false ; System.out.println("finished"); } }
- A.
Finished
- B.
Compiliation fails.
- C.
Run time fails
- D.
None of the above
- 15.What will be output of following program. public class TestMain { public static void main(String[] args) { int a = 5; int b = a++ * a++; System.out.println(" a = " + a); System.out.println(" b = " + b); }
- A.
6, 30
- B.
7, 42
- C.
7, 30
- D.
6, 36
- 16.Select the ones you like
- A.
Option1
- B.
Option2
- C.
Option3
- D.
Option4
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