Interface segregation principle

ISP.java

//Bad example
interface IWorker {
    public void work();
    public void eat();
}

class Worker implements IWorker{
    public void work() {// ....working}
    public void eat() {// ...... eating in launch break}
}

class SuperWorker implements IWorker {
    public void work() { //.... working much more}
    public void eat() { //.... eating in launch break}
}

class Manager {
    IWorker worker;
    public void setWorker(IWorker w) {worker=w;}
    public void manage() {
        worker.work();
    }
}
      
//Good example
interface IWorkable {
    public void work();
}

interface IFeedable{
    public void eat();
}

class Worker implements IWorkable, IFeedable{
    public void work() {// ....working}
    public void eat() {//.... eating in launch break}
}

class Robot implements IWorkable{
    public void work() {// ....working}
}

class SuperWorker implements IWorkable, IFeedable{
    public void work() {//.... working much more}
    public void eat() {//.... eating in launch break}
}