Interfaces

Defining an interface

Java Syntax

public interface InterfaceName {
	method prototypes
}

Example

public interface Ownable {
    Owner owner();
    boolean updateOwner(Owner newOwner);
}

Implementing an interface

Java Syntax

public class ClassName implements InterfaceName1, InterfaceName2, ... {
	data members
	constructors
	methods
}

Example

public class Car implements Ownable {

    // data members
    private Owner myOwner;
	
	
	
    // constructors
	
    // other Car methods
	
    public Owner owner() {
    	return myOwner; // method implementation
    }
	
    public void updateOwner(Owner newOwner) {
        myOwner = newOwner;
        return true;
    }
}