How to implement Map Collection traversal in Java
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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