jkost.github.io/Courses/Mathesis/Intro2ProgrammingWithJava/Week4/4.1-Inheritance/sandbox/interfaces.html at master · jkost/jkost.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <link rel="stylesheet" href="https://javaalmanac.io/almanac.min.css">
</head>
<body>

<div class="content" id="content">

<sandbox version="java17" mainclass="Main" preview="true" v-cloak>
<sandbox-source name="Main.java">
interface AInterface {
    default String message() {
        return "Hallo A";
    }
}

class A implements AInterface {
}

interface BInterface extends AInterface {
    default String message() {
        return "Hallo B";
    }
}

class B implements BInterface {
}

class C extends B {
    public String message() {
        return "Hallo C";
    }
}

class D extends C implements AInterface { }

interface Z { static void print() { System.out.println("Hello Z"); }}

class ZZ implements Z {}

public class Main {
  public static void main(String[] args) {
	AInterface a = new A();
	System.out.println(a.message());

	AInterface b = new B();
	System.out.println(b.message());

	AInterface c = new C();
	System.out.println(c.message());

	AInterface d = new D();
	System.out.println(d.message());

	Z.print();
  }
}</sandbox-source>
</sandbox>
</div>
<script src="https://javaalmanac.io/app/sandbox-bundle.js"></script>
<script>new Vue({ el: '#content' })</script>
</body>
</html>