Java Multiple Interfaces
/Extending Multiple Interfaces
A Java class can only extend one parent class. Multiple inheritance is not allowed. Interfaces are not classes, however, and an interface can extend more than one parent interface.
The extends keyword is used once, and the parent interfaces are declared in a comma-separated list.
Example
public interface Hockey extends Sports, Eventimplement two interfaces java
public class A implements C,D {...}reason we can implement multiple interfaces in java
A class can implement any number of interfaces.
In this case there is no ambiguity even
though both the interfaces are having same method.
Because methods in an interface are always
abstract by default, which doesn’t let them
give their implementation
in interface itself.how to declare a interface in java
// Assume we have the simple interface:
interface Appendable {
void append(string content);
}
// We can implement it like that:
class SimplePrinter implements Appendable {
public void append(string content) {
System.out.println(content);
}
}
// ... and maybe like that:
class FileWriter implements Appendable {
public void append(string content) {
// Appends content into a file
}
}
// Both classes are Appendable.
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