接口练习

package come.hanqi;

public interface ICpu {
//创建接口
    //性能
    public void xingneng();

    //品牌
    public void pinpai();

    //质量
    public void zhiliang();
}

package come.hanqi;

public class CPU implements ICpu {
//实现接口

    @Override
    public void xingneng() {

        System.out.println("性能良好");

    }

    @Override
    public void pinpai() {

        System.out.println("品牌为：因特尔");

    }

    @Override
    public void zhiliang() {
        System.out.println("质量为优等");

    }

}

package come.hanqi;

public class Computer {

    private CPU cpu;

    public void cpu()
    {
        if(cpu==null)
        {
            System.out.println("没有装cpu");

        }
        else
        {
            System.out.println("已装cpu");
            cpu. xingneng();
            cpu.zhiliang();
            cpu.pinpai();
        }
    }

    public CPU getCpu() {
        return cpu;
    }

    public void setCpu(CPU cpu2) {
        this.cpu = cpu2;
    }
}

package come.hanqi;

public class Testcpu {

    //private static final String ICpu = null;

    public static void main(String[] args) {

        Computer zw=new Computer();

        zw.setCpu(new CPU());

        zw.cpu();

    }

}

运行结果：

已装cpu
性能良好
质量为优等
品牌为：因特尔