苍蝇有" + legs + "条腿

interface Flyable {
void fly();
}

abstract class Insect {
int legs;

public Insect(int legs) {
    this.legs = legs;
}

abstract void reproduce();

}

class Fly extends Insect implements Flyable {
public Fly(int legs) {
super(legs);
System.out.println("苍蝇有" + legs + "条腿。");
}

@Override
public void fly() {
    System.out.println("苍蝇可以在空中飞行。");
}

@Override
void reproduce() {
    System.out.println("苍蝇的繁殖方式是产卵。");
}

}

public class Test {
public static void main(String[] args) {
Fly fly = new Fly(6);
fly.fly();
fly.reproduce();
}
}