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Welcome to the java lang and java io MCQs Page

Dive deep into the fascinating world of java lang and java io with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of java lang and java io, a crucial aspect of Java Programming. In this section, you will encounter a diverse range of MCQs that cover various aspects of java lang and java io, 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 java lang and java io. 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 java lang and java io. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

java lang and java io MCQs | Page 2 of 26

Q11.
Which of these is a wrapper for data type int?
Discuss
Answer: (a).Integer
Q12.
Which of the following methods is a method of wrapper Integer for obtaining hash code for the invoking object?
Discuss
Answer: (c).int hashCode()
Q13.
Which of these is a super class of wrappers Long, Character & Integer?
Discuss
Answer: (d).Number
Q14.
Which of these is a wrapper for simple data type char?
Discuss
Answer: (b).Character
Q15.
Which of the following is method of wrapper Integer for converting the value of an object into int?
Discuss
Answer: (b).int intValue();
Q16.
Which of these methods is used to obtain value of invoking object as a long?
Discuss
Answer: (b).long longValue()
Q17.
What is the output of this program?
    class Output 
    {
        public static void main(String args[]) 
        {
            char a[] = {'a', '5', 'A', ' '};   
            System.out.print(Character.isDigit(a[0]) + " ");
            System.out.print(Character.isWhitespace(a[3]) + " ");
            System.out.print(Character.isUpperCase(a[2]));
        }
    }
Discuss
Answer: (b).false true true
Q18.
What is the output of this program?
    class Output 
    {
        public static void main(String args[]) 
        {
            Integer i = new Integer(257);  
            byte x = i.byteValue();
            System.out.print(x);
        }
    }
Discuss
Answer: (b).1
Q19.
Which of these class have only one field ‘TYPE’?
Discuss
Answer: (a).Void
Q20.
Which of the following method of Process class can terminate a process?
Discuss
Answer: (b).void destroy()
Page 2 of 26

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