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Why doesn't the Map interface in Java have a removeAll(Collection<?> c) method to remove keys, like it has map.remove(Object)?
I know I can always do map.keySet().removeAll(..) .. but is this a reason that Map doesn't have removeAll() and encourages us to go with map.keySet().removeAll(..) ?
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You may need to update your Google Maps app, connect to a stronger Wi-Fi signal, recalibrate the app, or check your location services. You can also reinstall the Google Maps app if it isn't working, or simply restart your iPhone or Android phone. Visit Business Insider's homepage for more stories.
Though all areas are the correct size relative to each other, most land masses are distorted in order to make it so. Land masses appear stretched — horizontally at the poles and vertically at the Equator — meaning that, though countries are roughly the correct size, they are by no means the right shape.
“The map is not the territory” is a phrase coined by the Polish-American philosopher and engineer Alfred Korzybski. He used it to convey the fact that people often confuse models of reality with reality itself. According to Korzybski, models stand to represent things, but they are not identical to those things.
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The philosophy behind the collections APIs is to be as small and simple as possible. The Collection views on Map allow you to perform this operation already, so there is no need for an extra method.
The keySet method returns a view of the Map. Operations on the key set are reflected on the map.
The more general question on interface design: Why doesn't interface X have convenient method Y? is addressed in more depth by Martin Fowler's discussion of MinimalInterface vs HumaneInterface.
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