Interfaces and inheritance in Java:

Some programming languages permita class to inherit from two or more other classes - this is known as multiple inheritance. In Java, this is not permitted - a Java class can inherit from at most one other class, using the extends keyword. Typically, multiple inheritance is used when a programmer wants a class to inherit certain behaviour from each of a number of superclasses. This can, however, lead to a number of complications, such as making the class hierarchy rather complex.

Java neatly avoids such problems by the use of interfaces. Classes can implement more than one interface, as well as potentially extending one class - this gives an alternative to multiple inheritance, without most of its complications. For example, consider the following class header:

class MonthlyEmployee extends Employee
implements Comparable, Serializable

{ 

...
}

If the class implements more than one interface, the interface names are listed in any order, separated by commas

Although an interface is not a class, it is possible for an interface to inherit from another interface, using the extends keyword. For example:

public interface List extends Collection
{
...
}

This means that the List interface has all the methods or constants defined in the Collection interface and may add more methods or constants to this. Interfaces can have an inheritance hierarchy, similar to a class hierarchy. For example:

public interface Set extends Collection
{
...
}
public interface SortedSet extends Set
{
...
}

In fact, multiple inheritance is allowed for interfaces (unlike for Java classes). This is consistent with permitting classes to implement more than one interface. For example:

public interface PersistentComparable extends Comparable, Serializable
{
...
}

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