Interfaces - in COBOL and Java

*> Accessibility keywords
*>public
*>private
*>internal
*>protected
*>protected internal
*>static

class-id Competition.

end class.

*> Inheritance
class-id FootballGame inherits type Competition.

end class.


*> Interface definition
interface-id IClock.

end interface.

interface-id ITimer.

end interface.

*> Extending an interface 
interface-id IAlarmClock inherits type IClock.

end interface.


*> Interface implementation
class-id WristWatch implements type IAlarmClock, type ITimer.

end class.

//Accessibility keywords 
public
private
// The closest counterpart to .NET's "internal" is specified
// by ommitting the visibility keyword, though this "default"
// visibility has some behavior differences.
protected
static

// Inheritance
class FootballGame extends Competition
{
  ...
}


// Interface definition
interface IAlarmClock
{
  ...
}

// Extending an interface 
interface IAlarmClock extends IClock
{
  ...
}


// Interface implementation
class WristWatch implements IAlarmClock, ITimer
{
   ...
}