Page 366 - Computer_Science_F5

(c) Multiple inheritance in Java interfaces, which offers certain advantages
Multiple inheritance is the ability of a of multiple inheritance without the
programming language to enable a class associated complexities. In Java, a class
to inherit characteristics from more than can implement multiple interfaces, each of Chapter Five: Object oriented programming with Java
one parent class. However, in Java, which specifies a set of methods that the
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class must implement. By implementing
direct support for multiple inheritance multiple interfaces, a class can inherit
of classes is not provided. Instead, Java behaviors from each interface while still
allows for multiple inheritance using an adhering to a single inheritance hierarchy.

Java interfaces
An interface in Java is a blueprint for a group of related methods without providing
implementations. In Java, interfaces establish an arrangement for classes by defining
a series of method declarations without implementing them. Classes implement
interfaces by providing actual implementations for the methods defined in the
interface.

(a) Interface Declaration
An interface is declared using the “interface” keyword followed by the interface
name. This can be presented as:

interface Animal {
void eat(); //Interface method does not have a body
void sleep(); // Interface method does not have a body
}

(b) Implementing an interface

To implement an interface, a class uses the “implements” keyword followed by the
interface name. To utilise the methods defined in an interface, another class must
“implement” the interface using the implements keyword instead of extends. The
body of the interface method is provided by the “implement” class, as shown in
Program Example 5.24.

Program Example 5.24:

Java program for interface

// Interface
interface Bird {
public void birdcries(); // interface method (does not have a body)

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Student’s Book Form Five

Computer Science Form 5.indd 357 23/07/2024 12:34