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JAVA Programming
Map<String, Integer> map = new HashMap<>();
map.put("one", 1);
map.put("two", 2);
map.put("three", 3);
Set<String> keySet = map.keySet();
System.out.println(keySet); // prints [one, two, three]
keySet.remove("two");
System.out.println(map); // prints {one=1, three=3}
System.out.println(keySet.contains("one")); // prints true
System.out.println(keySet.size()); // prints 2
In this example, we create a map with three key-value pairs. We then obtain the KeySet view using the keySet() method and print its contents. Next, we remove the key "two" from the KeySet view, which also removes the corresponding entry from the original map. Finally, we use some of the other methods provided by the KeySet view to check if a key is present and get its size.
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