Java Core Mock Test-3
Access Specifers, Constructors and method
- 1.Which access modifier have almost identical behaviour as that of default.?
- A.
Protected
- B.
Public
- C.
Private
- D.
Both public and protected
- 2.Check the statements which are true.(Choose all that apply)
- A.
A member declared as ‘public’ CAN be accessed from ‘Other packages’.
- B.
A member declared with ‘protected’ access modifier CAN be accessed by the members of the ‘subclass’.
- C.
A member declared with ‘protected’ access modifier CANNOT be accessed by the members of the ‘Other package’.
- D.
A member declared with ‘Default’ access modifier CANNOT be accessed by the members of the ‘subclass’.
- 3.State True are False. Overriding does not depends on inheritance.
- A.
True
- B.
False
- 4.Consider the following code: class AT1 { public static void main (String[] args) { byte[] a = new byte[1]; long[] b = new long[1]; float[] c = new float[1]; Object[] d = new Object[1]; System.out.print(a[0]+","+b[0]+","+c[0]+","+d[0]); } } Which of the following will be the output of the above code?
- A.
Prints: 0,0,0,null
- B.
Run-time error
- C.
Prints: 0,0,0.0,null
- D.
Compile-time error 12 Consider the following code snippet: interface i1 { int i = 0; } interface i2 { int i = 0; } class inter implements i1, i2 { public static void main(String[] a) { System.out.println(i); } } Which of the following options will be the output of the above code snippet? Answer: a. Runtime
- 5.The following class definitions are in separate files. Note that the Widget and BigWidget classes are in different packages: package conglomo; public class Widget extends Object{ private int myWidth; XXXXXX void setWidth( int n ) { myWidth = n; } } // the following is in a separate file and in separate package package conglomo.widgets; import conglomo.Widget ; public class BigWidget extends Widget { BigWidget() { setWidth( 204 ); } } Which of the following modifiers, used in line 4 instead of XXXXXX, would allow the BigWidget class to access the setWidth method (as in line 12)? (Choose 2)
- A.
Final
- B.
Default (blank), that is, the method declaration would read void setWidth( int n )
- C.
Protected
- D.
Private
- E.
Public
- 6.what do u mean by signatures in the function overloading?
- A.
Return types
- B.
Parameters of functions
- C.
Datatypes of parameters
- D.
Properties
- 7.interface Base { boolean m1 (); byte m2(short s); } which two code fragments will compile?
- A.
Abstract class Class2 implements Base {}
- B.
Abstract class Class2 extends Base { public boolean m1(){ return true; }}
- C.
Abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }}
- D.
Abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}
- 8.public class Test { } What is the prototype of the default constructor?
- A.
Test( )
- B.
Public Test( )
- C.
Test(void)
- D.
Public Test(void)
- 9.Consider the code publi class Animal { public void eat() } Which is the legal method override of Animal eat()
- A.
Private void eat()
- B.
Public void eat()
- C.
Public void eat() throws Exeption
- D.
Public String eat()
- 10.public class Outer { public void someOuterMethod() { //Line 5 } public class Inner { } public static void main(String[] argv) { Outer ot = new Outer(); //Line 10 } } Which of the following code fragments inserted, will allow to compile?
- A.
New Inner(); //At line 5
- B.
New Inner(); //At line 10
- C.
New ot.Inner(); //At line 10
- D.
New Outer.Inner(); //At line 10
- 11.Given a method in a protected class, what access modifier do you use to restrict access to that method to only the other members of the same class?
- A.
Final
- B.
Private
- C.
Protected
- D.
Default
- 12.Class Animal { class Dog extends Animal { class DogTest { public static void main(String ar[]) { Animal animal=new Animal(); Dog d=(Dog) animal; } } What happen when the program is executed?
- A.
Runtime exception
- B.
Throws ClassCastExeption
- C.
Throws NullPointerException
- D.
No error, will compile.
- 13.State True or False Abstract methods must be implemented by the concrete subclass, its also like concrete subclass overrides the abstract methods
- A.
True
- B.
False
- 14.class A { protected int method1(int a, int b) { return 0; } } Which is valid in a class that extends class A?
- A.
Public int method1(int a, int b) {return 0; }
- B.
Private int method1(int a, int b) { return 0; }
- C.
Public short method1(int a, int b) { return 0; }
- D.
Static protected int method1(int a, int b) { return 0; }
- 15.Which of the following class level (nonlocal) variable declarations will not compile?
- A.
Protected int a;
- B.
Transient int b = 3;
- C.
Private synchronized int e;
- D.
Volatile int d;
- 16.public class Myfile { public static void main (String[] args) { String biz = args[1]; String baz = args[2]; String rip = args[3]; System.out.println("Arg is " + rip); } } Select how you would start the program to cause it to print: Arg is 2
- A.
Java Myfile 222
- B.
Java Myfile 1 2 2 3 4
- C.
Java Myfile 1 3 2 2
- D.
Java Myfile 0 1 2 3
- 17.Choose all that apply.
- A.
Overloaded methods must change the argument list
- B.
Overloaded methods can change the argument list
- C.
Overloaded methods can change the return type
- D.
Overloaded methods must change the return type
- E.
Overloaded methods can delare new or broader checked exceptions
- 18.Public class foo { public void dostuff(int y,String s) {} } class bar extends foo { public void dostuff(int y, long s)throws IOException } What is true about this?
- A.
Dostuff method is not overridden
- B.
Subclass bar overrides the dostuff() method
- C.
Dostuff method is not overloaded.
- D.
IOException an not be inserted in the overloading method.
- 19.Abstract class Director { protected String name; Director(String name) { this.name = name; } abstract void occupation(); } class FilmDirector extends Director { FilmDirector(String name) { super(name); } void occupation() { System.out.println("Director " + name + " directs films"); } } public class TestDirector { public static void main(String[] args) { FilmDirector fd = new FilmDirector("Manirathnam"); fd.occupation(); new Director("Manirathnam") { void occupation() { System.out.println("Director " + name + " also produces films"); } } .occupation(); } } Which of the following will be the output of the above code snippet?
- A.
Compilation fails at TestDirector class
- B.
Prints: Director Manirathnam also produces films
- C.
Prints: Director Manirathnam directs films Director Manirathnam also produces films
- D.
Prints: Director Manirathnam directs films
- 20.Which of the following modifier cannot be applied to the declaration of a field?
- A.
Protected
- B.
Final
- C.
Abstract
- D.
Public
- 21.Consider s1 and s2 are sets. Which of the following options gives the exact meaning of the method call s1.retainAll(s2)?
- A.
A. transforms s1 into the union of s1 and s2
- B.
Transforms s1 into the intersection of s1 and s2.
- C.
Transforms s1 into the (asymmetric) set difference of s1 and s2
- D.
Copies elements from s2 to s1
- 22.Class Test { Test(int i) { System.out.println("Test(" + i +")"); } } public class Question{ static Test t1 = new Test(1); Test t2 = new Test(2); static Test t3 = new Test(3); public static void main(String[] args){ Question Q = new Question(); } } Which of the following options gives the correct order of initialization?
- A.
A. Test(3) Test(2) Test(1)
- B.
Test(2) Test(1) Test(3)
- C.
Test(1) Test(2) Test(3)
- D.
Test(1) Test(3) Test(2)
- 23.Class TestString4 { public static void main(String args[]) { String s1 = "Its Great"; String s2 = "Its Tricky"; System.out.print(s1.concat(s2).length() + " "); System.out.print(s1.concat(s2.substring(1, s1.length())).length()); } } What will be the output of the following code snippet? Answer:
- A.
18 20
- B.
17 18
- C.
19 17
- D.
17 17
- 24.Which of the following options is true about multi-level inheritance?
- A.
Inheriting from two super classes
- B.
Inheriting from a class which is already in an inheritance hierarchy
- C.
Inheriting from more than one super class
- D.
Inheriting from a single class
- 25.Anonymous class can have their own members.
- A.
True
- B.
False
Questions: 30 | Attempts: 2680 | Last updated: Mar 22, 2022
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