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This article is about how to implement traversal of Map collections in Java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Map collection traversal mode

Method 1: through map.keySet (), as follows:

Public void mapKeySet (Map map) {

/ / get the collection of the map collection key through map.keySet () and then traverse the key to get the value according to the key

For (String key:map.keySet ()) {

String value = map.get (key) .toString (); / / get the value through key

System.out.println ("key:" + key+ "vlaue:" + value)

}

} method 2: use iterator through Map.entrySet, as follows:

Public void mapEntrySet (Map map) {

/ / Map.entrySet traverses using iterator to get key and value values

Iterator entry = map.entrySet () .iterator ()

While (entry.hasNext ()) {

Entry newEntry = entry.next ()

System.out.println ("key:" + newEntry.getKey () + "value:" + newEntry.getValue ())

}

} method 3: through Map.entrySet (), as follows:

Public void mapEntrySet (Map map) {

/ / through map. EntrySet () to traverse key and value

For (Map.Entry entry: map.entrySet ()) {

System.out.println ("key:" + entry.getKey () + "value:" + entry.getValue ());}

} Note: this method is recommended, especially for Map collections with large capacity

Method 4: get all the value by Map.values () traversal, as follows:

Public void mapValues (Map map) {

For (Object obj:map.values ()) {

System.out.println (obj)

}

} Note: the map collection key cannot be obtained in this way

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