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In Object-Oriented Programming (OOP), key concepts include classes, objects, instances, and the various features that define OOP languages such as encapsulation, inheritance, and polymorphism. Understanding Java syntax f…
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Write a java program to sum first n natural numbers.
Use a loop to iterate from 1 to n and accumulate the sum.
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Draw and explain life cycle of Thread.
The thread life cycle includes states like New, Runnable, Blocked, Waiting, Timed Waiting, and Terminated.
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With the help of example explain use of break and continue in java.
Break exits the loop, while continue skips the current iteration.
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Write a code segment to get input from keyboard in java. Import all necessary packages.
Use Scanner class from java.util package to read input.
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Write a java program for adding two 2x2 matrix.
Use nested loops to iterate and sum corresponding elements.
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Write a java program to sort an array of five integers in descending order.
Use Arrays.sort() with a custom comparator or implement a sorting algorithm.
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Show the two methods which are used to create a thread in Java.
Threads can be created by extending Thread class or implementing Runnable interface.
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Explain the syntax of loops in java.
Loops in Java include for, while, and do-while with specific syntax for each.
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Write java syntax to create array with five integers. (use array initialization)
int[] arr = {1, 2, 3, 4, 5};
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Write a java syntax to create a two dimensional array with 3 row and 3 columns. Also initialize the array.
int[][] arr = {{1,2,3}, {4,5,6}, {7,8,9}};
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Define exception. Explain throw and throws.
An exception is an event that disrupts the normal flow of execution; 'throw' is used to explicitly throw an exception, while 'throws' declares an exception in a method signature.
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With the help of example explain the priority queue in java.
PriorityQueue orders elements based on their natural ordering or a comparator.
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With the help of example explain handling events in javaFX.
Event handling in JavaFX involves using event handlers to respond to user actions.
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Define Object, Class and Instance
Object is an instance of a class, a Class is a blueprint for creating objects, and an Instance is a specific realization of a class.
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List any four features of Object oriented programming language.
Features include encapsulation, inheritance, polymorphism, and abstraction.
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List and explain any three category of operator in java.
Categories include arithmetic operators, relational operators, and logical operators.
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Explain abstract method using example.
An abstract method is declared without implementation, requiring subclasses to provide it.
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Explain abstract class with the help of example.
An abstract class cannot be instantiated and can contain abstract methods.
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Compare run time and compile time exception.
Compile time exceptions are checked at compile time, while runtime exceptions occur during program execution.
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List various UI Controls in javaFX.
Controls include Button, Label, TextField, and ComboBox.
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List various classes of java.io package used for Text IO.
Classes include FileReader, BufferedReader, PrintWriter.
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List various classes of java.io package used for Binary IO.
Classes include FileInputStream, FileOutputStream, ObjectInputStream.
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Compare Set and List in java.
Set does not allow duplicates, while List allows duplicates and maintains insertion order.
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Compare Vector and Stack.
Vector is synchronized and can grow dynamically, while Stack is a subclass of Vector with LIFO behavior.
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List various static methods of List.
Static methods include of(), copyOf(), and toArray().
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