java 接口

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package edu.javase.buffer;

interface faces {
    public void facefun1();

    public int facefun2();

    public String facefun3();
}

class demoface implements faces {

    @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;
    }
}

public class demointerface {
    public static void main(String[] args) {
        demoface dd = new demoface();
        dd.facefun1();
        dd.facefun2();
        dd.facefun3();
    }
}

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