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19 lines
399 B
19 lines
399 B
/**
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* 电脑：使用USB设备
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*/
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public class Computer {
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/**
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* 使用USB设备
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* @param usb USB设备实例
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*/
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public void useUSB(USB usb) {
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if (usb == null) {
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System.out.println("USB设备为空，无法使用。");
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return;
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}
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usb.open();
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System.out.println("使用USB设备中...");
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usb.close();
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}
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}
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