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Computer Science public void verticalmotion(); // interface method (does not have a body)
}
// Hen “implements” the Bird interface
class Hen implements Bird {
FOR ONLINE READING ONLY
public void birdcries() {
// The body of birdcries() is provided here
System.out.println(“The hen speak: kooo..kokoko…kookoko”);
}
public void verticalmotion() {
// The body of verticalmotion() is provided here
System.out.println(“fyu!fyu!fyu!fyu!fyuuuuu”);
}
}
class Main {
public static void main(String[] args) {
Hen myHen = new Hen(); // This create a Hen object
myHen.birdcries();
myHen.verticalmotion();
}
}
Output:
Figure 5.26: Output of interface program
(c) Multiple inheritance using interface
In Java, multiple inheritance can be achieved using interfaces. Unlike classes, Java
permits a class to implement multiple interfaces. This allows the class to inherit
method signatures from multiple interfaces, enabling it to exhibit behavior from
each interface it implements. This approach avoids the conflicts that can arise with
multiple inheritance in class-based systems, known as the diamond problem. In
order to implement multiple interfaces, use a comma to separate them. Program
Example 5.25 shows a multiple interface.
358
for Advanced Secondary Schools
Computer Science Form 5.indd 358 23/07/2024 12:34
