Given the list of employees, count number of employees with age

Given the list of employees, count number of employees with age 25?

You can use the Java 8 Stream API along with the filter() and count() methods to count the number of employees with age 25. Here's how you can do it:

import java.util.Arrays;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        // Sample list of employees
        List<Employee> employees = Arrays.asList(
                new Employee("Alice", 25),
                new Employee("Bob", 30),
                new Employee("Charlie", 20),
                new Employee("David", 25)
        );

        // Count number of employees with age 25
        long count = employees.stream()
                             .filter(employee -> employee.getAge() == 25)
                             .count();

        System.out.println("Number of employees with age 25: " + count);
    }
}

class Employee {
    private String name;
    private int age;

    public Employee(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

In this example:

• We define a Employee class to represent employees with name and age properties.
• We create a list of Employee objects.
• We use the stream() method to convert the list into a Stream.
• We use the filter() method to filter employees whose age is 25.
• We use the count() method to count the number of employees with age 25.
• We print the count to the console.

This code will output the number of employees with age 25:

Number of employees with age 25: 2