Java Interfaces and Packages Mcqs
Our collections of Multiple choice questions and answers focuses on study of Java Interfaces and Packages. These questions are chosen from a collection of most authoritative and best reference books on Java. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams and various tests and job interviews. One should practice our Mcqs to assimilate Java Interfaces and Packages topic comprehensively.
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2.
Which of these is a mechanism for naming and visibility control of a class and its content?
3.
Which of this access specifies can be used for a class so that its members can be accessed by a different class in the same package?
4.
Which of these access specifiers can be used for a class so that its members can be accessed by a different class in the different package?
6.
Which of the following is an incorrect statement about packages?
7.
Which of the following package stores all the standard java classes?
8.
What is the output of this program?
package pkg;
class display
{
int x;
void show()
{
if (x > 1)
System.out.print(x + " ");
}
}
class packages
{
public static void main(String args[])
{
display[] arr=new display[3];
for(int i=0;i<3;i++)
arr[i]=new display();
arr[0].x = 0;
arr[1].x = 1;
arr[2].x = 2;
for (int i = 0; i < 3; ++i)
arr[i].show();
}
}
package pkg;
class display
{
int x;
void show()
{
if (x > 1)
System.out.print(x + " ");
}
}
class packages
{
public static void main(String args[])
{
display[] arr=new display[3];
for(int i=0;i<3;i++)
arr[i]=new display();
arr[0].x = 0;
arr[1].x = 1;
arr[2].x = 2;
for (int i = 0; i < 3; ++i)
arr[i].show();
}
}
9.
What is the output of this program?
package pkg;
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello");
s1.setCharAt(1, x);
System.out.println(s1);
}
}
package pkg;
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello");
s1.setCharAt(1, x);
System.out.println(s1);
}
}
10.
What is the output of this program?
package pkg;
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello World");
s1.insert(6 , "Good ");
System.out.println(s1);
}
}
package pkg;
class output
{
public static void main(String args[])
{
StringBuffer s1 = new StringBuffer("Hello World");
s1.insert(6 , "Good ");
System.out.println(s1);
}
}
11.
Which of these keywords is used to define interfaces in Java?
12.
Which of these access specifiers can be used for an interface?
13.
Which of these keywords is used by a class to use an interface defined previously?
14.
Which of the following is the correct way of implementing an interface salary by class manager?
15.
What is the output of this program?
interface calculate
{
void cal(int item);
}
class display implements calculate
{
int x;
public void cal(int item)
{
x = item * item;
}
}
class interfaces
{
public static void main(String args[])
{
display arr = new display;
arr.x = 0;
arr.cal(2);
System.out.print(arr.x);
}
}
interface calculate
{
void cal(int item);
}
class display implements calculate
{
int x;
public void cal(int item)
{
x = item * item;
}
}
class interfaces
{
public static void main(String args[])
{
display arr = new display;
arr.x = 0;
arr.cal(2);
System.out.print(arr.x);
}
}
16.
What is the output of this program?
interface calculate
{
void cal(int item);
}
class displayA implements calculate
{
int x;
public void cal(int item)
{
x = item * item;
}
}
class displayB implements calculate
{
int x;
public void cal(int item)
{
x = item / item;
}
}
class interfaces
{
public static void main(String args[])
{
displayA arr1 = new displayA;
displayB arr2 = new displayB;
arr1.x = 0;
arr2.x = 0;
arr1.cal(2);
arr2.cal(2);
System.out.print(arr1.x + " " + arr2.x);
}
}
interface calculate
{
void cal(int item);
}
class displayA implements calculate
{
int x;
public void cal(int item)
{
x = item * item;
}
}
class displayB implements calculate
{
int x;
public void cal(int item)
{
x = item / item;
}
}
class interfaces
{
public static void main(String args[])
{
displayA arr1 = new displayA;
displayB arr2 = new displayB;
arr1.x = 0;
arr2.x = 0;
arr1.cal(2);
arr2.cal(2);
System.out.print(arr1.x + " " + arr2.x);
}
}