Taskthree.java

class Employee {
    protected int empID;
    protected String empname;

    public Employee(int empID, String empname) {
        this.empID = empID;
        this.empname = empname;
    }

    public void displayEmpinfo() {
        System.out.println("Employee name is: " + empname);
        System.out.println("Employee ID is: " + empID);
    }
}

class Manager extends Employee {
    private String deptname;
    private int teamsize;

    public Manager(int empID, String empname, String deptname, int teamsize) {
        super(empID, empname);
        this.deptname = deptname;
        this.teamsize = teamsize;
    }

    public void displayEmpinfo() {
        super.displayEmpinfo();
        System.out.println("Department name: " + deptname);
        System.out.println("Team size is: " + teamsize);
    }
}

class Developer extends Employee {
    protected String prolang;

    public Developer(int empID, String empname, String prolang) {
        super(empID, empname);
        this.prolang = prolang;
    }

    public void displayEmpinfo() {
        super.displayEmpinfo();
        System.out.println("Using language is: " + prolang);
    }
}

class SeniorDev extends Developer {
    private int expyear;

    public SeniorDev(int empID, String empname, String prolang, int expyear) {
        super(empID, empname, prolang);
        this.expyear = expyear;
    }

    public void displayEmpinfo() {
        super.displayEmpinfo();
        System.out.println("Total experience: " + expyear + " years");
    }
}

class JuniorDev extends Developer {
    private int trDuration;

    public JuniorDev(int empID, String empname, String prolang, int trDuration) {
        super(empID, empname, prolang);
        this.trDuration = trDuration;
    }

    public void displayEmpinfo() {
        super.displayEmpinfo();
        System.out.println("Training duration is: " + trDuration + " months");
    }
}

public class Taskthree {
    public static void main(String[] args) {

        Manager mgr = new Manager(101, "Abol", "IT Infrastructure", 8);

        System.out.println("[Manager Information]");
        mgr.displayEmpinfo();

        System.out.println();

        SeniorDev seniorDev = new SeniorDev(102, "Habul", "Java / Spring Boot", 7);

        System.out.println("[Senior Developer Information]");
        seniorDev.displayEmpinfo();

        System.out.println();

        JuniorDev juniorDev = new JuniorDev(103, "Kabul", "Python / React", 3);

        System.out.println("[Junior Developer Information]");
        juniorDev.displayEmpinfo();
    }
}