Code snippet 2 for Interface Segregation Principle

IPS2.java

// class Assignee
abstract class Assignee {}

// Interface Dev for Developer tasks
interface Dev { void code(); }

// Interface QA for Test tasks
interface QA { void test(); }

// Developer is an Assingee
class Developer extends Assignee implements Dev {
    @Override
    public void code() { System.out.println("Developer can code!"); }
}

// Tester is an Assingee
class Tester extends Assignee implements QA {
    @Override
    public void test() { System.out.println("Tester can test!"); }
}

// ProjectLead is an Assignee
class ProjectLead extends Assignee implements Dev, QA {
    @Override
    public void code() { System.out.println("ProjectLead can code!"); }
    @Override
    public void test() { System.out.println("ProjectLead can test!"); }
}

public class ISP2 {
    public static void main(String[] args) {
        Developer coder = new Developer();
        Tester tester = new Tester();
        ProjectLead lead = new ProjectLead();

        coder.code();
        tester.test();
        lead.code();
        lead.test();
    }
}

Program output:

Developer can code!
Tester can test!
ProjectLead can code!
ProjectLead can test!