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每天一段代码-观察者模式(Observer pattern)

2019-11-17 02:22:18
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每天一段代码-观察者模式(Observer pattern)

知识点

  使对象之间达到松耦合的效果。 

  观察者模式定义了对象之间一对多的关系。主题用一个共同的接口来更新观察者。

  观察者和被观察者之间通过松耦合的方式结合,被观察者不用理会观察者的实现细节,只需要观察者实现了观察接口(即所谓的注册)。

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E1MaLvsJpMVpvVJJ7Jd0gf4Kf7mQccVpPJajUTQkwmU+wbg83MfX2Iu33s20UCUF+oL6B+UKeoUwCyDcweHU2DHW1mZmZ6evrcuxmlMt544436+vpkZq80K889xig8r9/EZHXItue/BfAvY17FfTPgnrSZZQ/Jt08J1BfqC6gf1CnqFIBsA7NHR9NaR5uZmXG73efOnfv9739fUlJSWlr68ssvl5SUvPTSS+vWrTt//vzIyEgkEkn0FknEXvAcq+bMfDvn4fz0PYvZJnoVp/HCkwCJtk8J1BfqC6gf1CnqFIBsA7NHR9NURwsGgx6P5+zZs4zWv/zyy++9997ly5cvXLhw+fLlxsbG5FofTb4UxyF9lHtVPCtXeFXsoWTbpwTqC/UF1A/qFHUKQLaB2aOjaaqjeTwet9vN3BJn9erV77///qNHj5h72Pt8vtnZ2XA4nPxdJBfP2sxEcPGsaCE9M/dutXEPmKwOwdL5qMNqYmfnhaJuMxOTKfZI0u1TAfWF+gLqB3WKOgUg28Ds0dE01dEYsy8rKystLf3v//7vn376yePxhEKhUCiUktNziBbIiG6Qw17Wmuja2diLBRfDCkRdoPIpbZ8KqC/UF1A/qFPUKQDZBmaPjqapjsaY/TfffPPNN9+0tbV5PJ4FCT29oL5QX0D9oE5RpwBkG5g9OpqmOlo4HGbk3u12ezye5EvqtQLqC/UF1A/qFHUKQLaB2aOjaa2jRQTke19yB+oL9QXUD+oUdQpAtoHZo6Oho2kB1BfqC6gf1CnqFIBsA7NHR0NHo4OJnifPvv96Ljyr+CzqC/UF1A/qFHUKQLaB2aOjoaPRQSjge/K19V971yv6PeoL9QXUD+oUdQpAtoHZo6Oho9HEjMep6PeoL9QXUD+oU9QpANkGZo+Oho5GH3K/R32hvoD6QZ2iTgHINjB7dDR0NFoR+v17W/+K+kJ9AZWD4yDqFIBsk1Ozd3udI5MDI5MDo0xMMTEoj7GpIVkMs+EcHnMOj4viebyYcI5MOEcmpuUxysRkLMak4RqbdI1NucbjhdM1ET8mhTHNhHtKFk4mXAoxzYZn2uWZdovCFSfcHia8fHgk4WVDCZ/X6/P6fD6fz+f3+//5369df/9VBBVx4/+8+tX7/4n6oqi+YAz6BMdB1CkA2SanZh8I+n0BD4KC8HvR0aig/8G3/9q7/tGlI/936/9GfVETqC+9guMgTYE6BXSSU7OfDQe9QRdC/TETCqCjqRze6f3OsSjqi6pAfekW1ClFgToFlAKzRygEOpqakTg9A+qLokB96RbUKUWBOgWUArNHKAQ6mjpRdHoG1BdFgfrSLahTigJ1CigFZo9QCHQ0FTLR80TR6RlQXxQF6ku3oE4pCtQpoJT8m/31u0+2n7wlj+t3nySuuiJDobGwSP5gUWGh5EFCSN57BF2BjkYdqC+KAvWlW1CnFAXqFFBK/s1++8lbittvP3krcdUVG43Lli6VP15UWFhoMKCjoaPpCtQXRYH60i2oU4oCdQooRRVmH4mE5+bYiETCkUgoGPAqdjSSjKQb571ZUBHoaNSB+qIoUF+6BXVKUaBOAaWowuyDQX8w6A8GfcGgLxDwuV0Tw/2/JJ6riNebCg0GnIVER9MhqC+KAvWlW1CnFAXqFFCKKsze73dLZhT6utsW19G8OAuJjqZLUF8UBepLt6BOKQrUKaAUVZi9x+N0uSanpkYmJ56Pjw0OOrq6O1qTdjQJilMUOBGJjqYTUF8UBepLt6BOKQrUKaAUVZj9UH/Xs87HnU9a7G0/dPx8v6218XHznQQdrdhoNBQUSJpXcZEx3rMFy5blvUfQFeho1IH6oihQX7oFdUpRoE4BpajC7Ntabff/ffVuw8XvGi5813Chsf6L7/91KUFHKzIUFhlEMxPCjiZZYmgoMDBPFRoMvzIW571ZUBHoaNSB+qIoUF+6BXVKUaBOAaXk3+wXeh/fYqORECLsTcwjfEdbsmQJ/5SxsIjvbsVF0jkMBDqaZkB9URSoL92COqUoUKeAUvJv9guKYqNxyZIlkh/mMBYW8asGhZcNGQuLCg2G4iJjUWFhwbJlTMh/1AOBjqYBUF8UBepLt6BOKQrUKaAUysy+0GAQtqQlS5awlw1xJyUNBYZio5H7u8BQUFBUWMhPYzAb5L1fqD/Q0agD9UVRoL50C+qUokCdAkqhzOwRuQl0NOpAfVEUqC/dgjqlKFCngFJg9giFQEejDtQXRYH60i2oU4oCdQooBWaPUAh0NOpAfVEUqC/dgjqlKFCngFJg9giFQEejDtQXRYH60i2oU4oCdQooBWaPUAh0NOpAfVEUqC/dgjqlKFCngFJg9giFQEejDtQXRYH60i2oU4oCdQooBWaPUAh0NOpAfVEUqC/dgjqlKFCngFJg9giFQEejDtQXRYH60i2oU4oCdQooJadmPw/oAR2NLlBfdIH60ieoU7pAnQIayanZ5+yzQPqgo9EF6osuUF/6BHVKF6hTQCMwe6AMOhpdoL7oAvWlT1CndIE6BTRCn9m7xWTkPYEcdDS6

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