OOP-I Exam Preparation
Full explanation, worked examples & memory tricks in the app
OOP-I Exam Preparation
English 25 leveled MCQs Free
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7 marks Long answer
Write a java program to sum first n natural numbers.
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Use a loop to iterate from 1 to n and sum the numbers.
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7 marks Long answer
With the help of example explain use of break and continue in java.
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Break exits the loop; Continue skips the current iteration.
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7 marks Long answer
Write a code segment to get input from keyboard in java. Import all necessary packages.
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Use Scanner class from java.util package.
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7 marks Long answer
Write a java program for adding two 2x2 matrix.
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Use nested loops to sum corresponding elements.
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7 marks Long answer
Write a java program to sort an array of five integer in descending order.
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Use Arrays.sort() in reverse order.
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7 marks Long answer
List various classes of java.io package used for Text IO.
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BufferedReader, FileReader, PrintWriter.
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7 marks Long answer
List various classes of java.io package used for Binary IO.
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FileInputStream, FileOutputStream, ObjectInputStream.
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7 marks Long answer
Draw and explain life cycle of Thread.
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Thread lifecycle includes New, Runnable, Blocked, Waiting, Timed Waiting, and Terminated states.
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7 marks Long answer
Show the two methods which are used to create a thread in Java.
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Extending Thread class and implementing Runnable interface.
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4 marks Medium answer
Explain the syntax of loops in java.
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Loops in Java include for, while, and do-while with specific syntax for each.
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4 marks Medium answer
Write java syntax to create array with five integers. (use array initialization)
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int[] arr = {1, 2, 3, 4, 5};
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4 marks Medium answer
Write a java syntax to create a two dimensional array with 3 row and 3 columns. Also initialize the array.
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int[][] arr = {{1,2,3}, {4,5,6}, {7,8,9}};
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4 marks Medium answer
Define exception. Explain throw and throws.
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An exception is an event that disrupts normal program flow; 'throw' creates an exception, 'throws' declares it.
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4 marks Medium answer
With the help of example explain the priority queue in java.
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PriorityQueue orders elements based on priority; example: storing tasks with different priorities.
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4 marks Medium answer
List various static methods of List.
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Methods include 'of()', 'copyOf()', 'fill()', 'sort()'.
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2 marks Short answer
Define Object, Class and Instance
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Object is an instance of a class; Class is a blueprint for creating objects; Instance is a specific realization of a class.
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2 marks Short answer
List any four features of Object oriented programming language.
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Encapsulation, Inheritance, Polymorphism, Abstraction.
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2 marks Short answer
List and explain any three category of operator in java.
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Arithmetic, Relational, and Logical operators.
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2 marks Short answer
Explain abstract method using example.
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An abstract method has no body and must be implemented in derived classes.
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2 marks Short answer
Explain abstract class with the help of example.
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An abstract class cannot be instantiated and may contain abstract methods.
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2 marks Short answer
Compare run time and compile time exception.
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Compile-time exceptions are checked at compile time; run-time exceptions occur during execution.
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2 marks Short answer
List various UI Controls in javaFX.
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Button, Label, TextField, and ComboBox.
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2 marks Short answer
With the help of example explain handling events in javaFX.
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Event handling in JavaFX involves using EventHandlers to respond to user actions.
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2 marks Short answer
Compare Set and List in java.
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Set does not allow duplicates; List allows duplicates and maintains order.
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2 marks Short answer
Compare Vector and Stack.
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Vector is synchronized; Stack is a subclass of Vector with LIFO behavior.
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