Explain features of Java programming. Write a program implementing class object.

Java is a popular programming language that is used to develop a wide range of applications, from desktop software to mobile apps and web applications. Some of the key features of Java programming include:

Object-oriented: Java is an object-oriented programming language, which means that it is based on the concept of objects. Everything in Java is an object, including classes, methods, and variables.
Platform-independent: Java programs can run on any platform that has a Java Virtual Machine (JVM), which means that Java code can be developed on one platform and run on any other platform that supports Java.
Garbage collection: Java has a built-in mechanism for automatic memory management called garbage collection. This means that developers don't have to manage memory manually, which can reduce errors and improve performance.
Multi-threaded: Java supports multi-threading, which means that multiple threads can execute concurrently within a single program. This allows developers to take advantage of modern multi-core processors and improve application performance.
Exception handling: Java provides a robust system for handling errors and exceptions, which makes it easier for developers to write reliable code that can handle unexpected situations.
Rich API: Java comes with a large set of APIs that make it easy to develop a wide range of applications, from desktop software to mobile apps and web applications.

Here is an example of implementing a class object in Java:

public class Car {
// member variables
private String make;
private String model;
private int year;
// constructor
public Car(String make, String model, int year) {
this.make = make;
this.model = model;
this.year = year;
}
// getter methods
public String getMake() {
return make;
}
public String getModel() {
return model;
}
public int getYear() {
return year;
}
// setter methods
public void setMake(String make) {
this.make = make;
}
public void setModel(String model) {
this.model = model;
}
public void setYear(int year) {
this.year = year;
}
}
// main program
public class Main {
public static void main(String[] args) {
// create a Car object
Car myCar = new Car("Toyota", "Camry", 2022);
// print the car's make, model, and year
System.out.println("Make: " + myCar.getMake());
System.out.println("Model: " + myCar.getModel());
System.out.println("Year: " + myCar.getYear());
// change the car's make and year
myCar.setMake("Honda");
myCar.setYear(2023);
// print the updated make and year
System.out.println("Make: " + myCar.getMake());
System.out.println("Year: " + myCar.getYear());
}
}

This program defines a Car class with three member variables (make, model, and year) and getter and setter methods for each variable. It also defines a Main class with a main method that creates a Car object and prints its make, model, and year. The program then updates the car's make and year using the setter methods and prints the updated values.

Write a program using the algorithm count() to count how many elements in a container have a specified value.

Here's an example program using the count() algorithm to count the number of occurrences of a specific value in a vector container: #include <iostream> #include <vector> #include <algorithm> using namespace std; int main() { vector<int> numbers = { 2, 5, 3, 7, 8, 5, 1, 5, 4 }; // count the number of occurrences of the value 5 in the vector int count = count(numbers.begin(), numbers.end(), 5); cout << "The number of occurrences of 5 in the vector is: " << count << endl; return 0; } Output: The number of occurrences of 5 in the vector is: 3 Explanation: The program starts by creating a vector named numbers that contains several integer values. The count() algorithm is used to count the number of occurrences of the value 5 in the numbers vector. The function takes three arguments: the beginning and end iterators of...

Define polymorphism. Differentiate between overloading and overriding method with example.

Polymorphism is a concept in object-oriented programming that allows objects of different classes to be treated as if they were objects of the same class. It allows a single method or operation to have different meanings or behaviors based on the context in which it is used. In Java, there are two types of polymorphism: Compile-time Polymorphism: This is achieved through method overloading, where two or more methods in a class have the same name but different parameters. Runtime Polymorphism: This is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its parent class. Here is an example of method overloading: class MyClass { public int sum(int a, int b) { return a + b; } public double sum(double a, double b) { return a + b; } } public class Main { public static void main(String[] args) { ...

write a program in C++ to overload '-' operator to find difference of two complex object.

write a program to overload '-' operator to find difference of two complex object /* program in C++ to overload '-' operator to find difference of two complex object */ #include<iostream> using namespace std; class Complex{ public: float a, b; complex(): a(0), b(0) {} complex(float x, float y): a(x), b(y){} void display(){ cout<<this->a<<"+"<<this->b<<"i"<<endl; } friend Complex operator-(const Complex&, const Complex&); }; complex operator-(const Complex& com, const Complex& comp){ float x= com.a - comp.a; foat y= com.b - comp.b; return Complex(x,y); } int main(){ Complex a(1,7), b(6,9); cout<<"A = ";a.display(); cout<<"B = ";b.display(); cout<<"A - B = ";(a-b).display(); ...

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