check if map contains key java
if (map.containsKey(key)) {
// Okay, there's a key but the value is null
} else {
// Definitely no such key
}check if map contains key java
if (map.containsKey(key)) {
// Okay, there's a key but the value is null
} else {
// Definitely no such key
}if hashmap contains only one key then how to get that key
HashMap<Node, Integer> x = qu.remove();
// This "qu" is a queue which is returning a Hashmap
// of type HashMap<Node, Integer> this hashmap contains
// only one key,value pair
Node node = x.keySet().iterator().next();
// here we are extracting that "KEY" of hashMap into variable of Node typeCopyright © 2021 Codeinu
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