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class Main {
public static void main(String[] args) {
System.out.println("Hello World!");
}
interface Quack {
class DuckCanQuack extends Duck implements Quack{}
void quack();
}
interface BarkAndQuack {
class DuckCanBarkAndQuack extends Duck implements BarkAndQuack{}
void bark();
void quack();
}
static class Duck {
public void quack() {}
public void fly() {}
}
}
Java
INFO