multiple interface in java code example

Example 1: 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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how to implement a interface in java

Example 2: 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.