Arrays.sort () method is given, but which implements the comparable method, it can achieve the sort

package test powerful performance Arrays sorting function;

import java.util.Arrays;

public class Ceshi {
    public static void main(String[] args) {
        Employee[] employees = new Employee[3];
        employees[0] = new Employee("lgq", 2309.98);
        employees[1] = new Employee("zcp", 234232.8);
        employees[2] = new Employee("wyl", 643.98);
        System.out.println(Arrays.deepToString(employees));
        Arrays.sort(employees);
        System.out.println(Arrays.deepToString(employees));
    }
}

class Employee implements Comparable<Employee> {

    String name;
    double salary;

    public Employee(String name, double salary) {
        this.name = name;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }

    public void raiseSalary(double byPercent) {
        double raise = salary * byPercent / 100;
        salary += raise;
    }

    @Override
    public String toString() {
        return "{" + this.name + ":" + this.salary + "}" ;
    }

    @Override
    public int compareTo(Employee o) {

        if (this.salary < o.salary) return -1;
        if (this.salary > o.salary) return 1;

        return 0;
    }
}