Courses/Mathesis/Intro2ProgrammingWithJava/Week4/4.1-Inheritance/sandbox/interfaces.html

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<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>
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