Which interface provides the ability to see changes in real-time as they occur ？（）<br>A: ConcurrentMap<br>B: java.util.AbstractMap<br>C: ObservableMap<br>D: InvocableMap

Which interface provides the ability to see changes in real-time as they occur ？（）
A: ConcurrentMap
B: java.util.AbstractMap
C: ObservableMap
D: InvocableMap

出自：Oracle认证

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