Java-DSA/ChapterComparator.java at main · shanks-d-fury/Java-DSA · GitHub

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import java.util.*;

class Employee {

String name;

String department;

double salary;

int age;

Employee(String name, String department, double salary, int age) {

this.name = name;

this.department = department;

this.salary = salary;

this.age = age;

}

public String getDepartment() {

return this.department;

}

public double getSalary() {

return this.salary;

}

public int getAge() {

return this.age;

}

@Override

public String toString() {

return name + " | " + department + " | $" + salary + " | Age: " + age;

}

public class ChapterComparator {

public static void main(String[] args) {

List<Employee> employees = Arrays.asList(

new Employee("Alice", "Engineering", 75000, 30),

new Employee("Bob", "Marketing", 60000, 28),

new Employee("Charlie", "Engineering", 75000, 27),

new Employee("David", "Engineering", 90000, 35),

new Employee("Eve", "Marketing", 60000, 25),

new Employee("Frank", "Engineering", 75000, 29));

// Custom Comparator using compare()

Comparator<Employee> employeeComparator = (Employee e1, Employee e2) -> {

// 1️⃣ Sort by Department (Alphabetically)

int departmentComparison = e1.department.compareTo(e2.department);

if (departmentComparison != 0) {

return departmentComparison;

}

// 2️⃣ If same department, sort by Salary (Descending)

int salaryComparison = Double.compare(e2.salary, e1.salary); // Higher salary first

if (salaryComparison != 0) {

return salaryComparison;

}

// 3️⃣ If same salary, sort by Age (Ascending)

return Integer.compare(e1.age, e2.age); // Younger first

};

// Sorting employees using custom comparator

employees.sort(employeeComparator);

// Alternative code to sort the following with the same conditions

employees.sort(Comparator.comparing(Employee::getDepartment)

.thenComparing(Employee::getSalary, Comparator.reverseOrder()).thenComparing(Employee::getAge));

// Printing sorted list

for (Employee e : employees) {

System.out.println(e);

}

Java-DSA/ChapterComparator.java at main · shanks-d-fury/Java-DSA · GitHub

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