Java-Book/03：类与对象/img/usb.drawio.svg

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                                计算机有USB接口
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                    计算机有USB接口
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                                手机也有USB接口
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                    手机也有USB接口
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                                这些接口定义了：
                                <br/>
                                1、电压（常量）
                                <br/>
                                <span style="background-color: initial;">
                                    2、数据传输的速度（常量）
                                    <br/>
                                    3、如何收发数据（方法）
                                    <br/>
                                    。。。
                                    <br/>
                                    <br/>
                                    但是计算机或者手机可能使用不同的芯片来实现这些接口（实现方式可能不同）
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                                    <br/>
                                    但是只要满足接口的标准，就可以互操作。
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                    这些接口定义了：1、电压（常量）...
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