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Welcome to the Interfaces and Packages MCQs Page

Dive deep into the fascinating world of Interfaces and Packages with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Interfaces and Packages, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of Interfaces and Packages, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Java Programming.

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Check out the MCQs below to embark on an enriching journey through Interfaces and Packages. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Java Programming.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Interfaces and Packages. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Interfaces and Packages MCQs | Page 1 of 12

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Q1.
Which of these keywords is used to define packages in Java?
Discuss
Answer: (c).package
Q2.
Which of these is a mechanism for naming and visibility control of a class and its content?
Discuss
Answer: (b).Packages
Q3.
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?
Discuss
Answer: (d).All of the mentioned
Q4.
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?
Discuss
Answer: (a).Public
Q5.
Which of the following is the correct way of importing an entire package โ€˜pkgโ€™?
Discuss
Answer: (c).import pkg.*
Discuss
Answer: (d).A package can be renamed without renaming the directory in which the classes are stored
Q7.
Which of the following package stores all the standard java classes?
Discuss
Answer: (b).java
Q8.
What is the output of this program?

Note : packages.class file is in directory pkg;
    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();
         }
    }
Discuss
Answer: (c).2
Q9.
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);
        }
    }
Discuss
Answer: (c).Hxllo
Q10.
What is the output of this program?

Note : Output.class file is not in directory pkg.
    package pkg;
    class output 
    {
        public static void main(String args[])
        {
            StringBuffer s1 = new StringBuffer("Hello World");
            s1.insert(6 , "Good ");
            System.out.println(s1);
        }
   }
Discuss
Answer: (d).Runtime error

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