Abstraction
- What is the output of this program?
class N
{
public int K;
protected int L;
}
class M extends N
{
int L;
void display()
{
super.L = 5;
System.out.println(K + " " + L);
}
}
public class Result
{
public static void main(String args[])
{
M object = new M();
object.K=3;
object.L=4;
object.display();
}
}
-
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NA
Correct Option: C
Both class N & M have member with same name that is L, member of class M will be called by default if no specifier is used. K contains 3 & L contains 4, printing 3 4.
- What is the output of this program?
class N
{
int K;
void display()
{
System.out.println(K);
}
}
class M extends N
{
int L;
void display()
{
System.out.println(L);
}
}
public class MethodOverriding
{
public static void main(String args[])
{
M object = new M();
object.K=6;
object.L=5;
object.display();
}
}
-
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NA
Correct Option: B
class N & class M both contain display() method, class M inherits class N, when display() method is called by object of class M, display() method of class M is executed rather than that of Class N.
- What is the output of this program?
class N
{
public int K;
public int L;
N()
{
K = 5;
L = 6;
}
}
class M extends N
{
int p;
M()
{
super();
}
}
public class super_Example
{
public static void main(String args[])
{
M object = new M();
System.out.println(object.K + " " + object.L);
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: A
Keyword super is used to call constructor of class N by constructor of class M. Constructor of a initializes K & L to 5 & 6 respectively.
- What is the output of this program?
class N
{
public int K;
private int L;
}
class M extends N
{
void display()
{
super.K = super.L + 2;
System.out.println(super.K + " " + super.L);
}
}
public class inheritance_Example
{
public static void main(String args[])
{
M object = new M();
object.K=1;
object.L=2;
object.display();
}
}
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
Class contains a private member variable L, this cannot be inherited by subclass M and does not have access to it.
- Which of these packages contains abstract keyword?
-
View Hint View Answer Discuss in Forum
NA
Correct Option: C
java.lang
