Download JNTUH MCA 3rd Sem R15 2022 March-April 823AD Marchapril Java Programming Question Paper

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Code No: 823AD R15

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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA III Semester Examinations, March/April - 2022

JAVA PROGRAMMING

Time: 3 Hours Max.Marks:75

Answer any five questions

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All questions carry equal marks

1. a) What is a Constructor? How to invoke a constructor in JAVA? Explain.
   b) Briefly describe about parameter passing techniques in Java. [8+7]
2. a) Discuss various primitive data types in Java.
   b) Write a java program to find maximum of three numbers using ternary operator. [7+8]

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3. Explain the use of ‘super’ and ‘final’ key words in java.
   Illustrate the importance of Abstract classes with a JAVA program. [7+8]
4. Write a detail note on interfaces and packages in java with examples. [15]
5. a) Explain the purpose of BufferedWriter classes in Java with an example.
   b) Write a Java program that reads from the ‘text’ file using File Reader. [7+8]

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6. Briefly explain about the following:
   1) Hash Table ii) String Tokenizer
7. Write a Java program to accepts a file name as command line argument and finds the length of the longest line in the file and displays an error message if the file does not exist. [7+8]
8. a) Demonstrate nested try statements and finally statements.
   b) Explain thread synchronization with respect to multithreading. [7+8]

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9. Describe the event handling mechanism in java with an example.
   Write an applet program that will take an input from the user to calculate the average of two integers. [7+8]

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