java 继承 多接口

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package edu.javase.buffer;

interface faces {
    public void facefun1();

    public int facefun2();

    public String facefun3();
}

interface faces2 {
    public void facefun11();

    public int facefun22();

    public String facefun33();
}

class fatherz {
    public fatherz() {
        System.out.println("fatherz 构造器");
    }

    public fatherz(int i) {
        System.out.println("fatherz int i 构造器" + i);
    }

    public void fatherfun() {
        System.out.println("fatherfun");
    }

}

class demoface extends fatherz implements faces, faces2 {// 一旦集成必须实现所有接口
    public demoface() {
        super();
        System.out.println("demoface 构造器");
    }

    public demoface(int i) {
        super(1);
        System.out.println("demoface int i 构造器" + i);
    }

    @Override
    public void facefun1() {
        System.out.println("实现接口  facefun1");
    }

    @Override
    public int facefun2() {
        System.out.println("实现接口  facefun2");
        return 0;
    }

    @Override
    public String facefun3() {
        System.out.println("实现接口  facefun3");
        return null;
    }

    @Override
    public void facefun11() {
        System.out.println("实现接口  facefun11");
    }

    @Override
    public int facefun22() {
        System.out.println("实现接口  facefun22");
        return 0;
    }

    @Override
    public String facefun33() {
        System.out.println("实现接口  facefun33");
        return null;
    }
}

public class demointerface {
    public static void main(String[] args) {
        demoface dd = new demoface();
        dd.facefun1();// 调用接口，并且实现
        dd.facefun2();
        dd.facefun3();

        dd.facefun11();
        dd.facefun22();
        dd.facefun33();
        System.out.println("----------------");

        demoface ff = new demoface(5);
        ff.fatherfun(); // 同事继承father
    }
}

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