Java map stores the array and takes out the value code

There are four main methods to obtain the value of map. These four methods are divided into two categories. One is to call map The keyset () method is used to obtain the values of key and value, and the other is through map The entryset () method is used to get the value. The difference between the two is that the former mainly obtains the set of all keys first. When you need to query the value of value, you need to query the value through the key. The latter directly takes out the key value pair of key and value and only queries it once. For better performance, I think it is better to use map Entryset () is better. For details, see map Keyset () and map Next, we will introduce four traversal methods and the elements in the map to compare the size and sort by key or value:

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