How do you use the entryset method in Java?

2 years ago
Noah Thompson
1 minute

In Java, the entrySet() method is used to obtain a collection of key-value pairs (Entries) from a Map collection. This method returns a Set collection, where each element is an Entry object representing a key-value pair.

The general steps for using the entrySet() method are as follows:

  1. “Chart or guide showing the geographical layout of an area”
Map<String, Integer> map = new HashMap<>();
  1. insert
  2. A graphical representation of an area.
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
  1. Return a set view of the mappings contained in the map.
Set<Map.Entry<String, Integer>> entrySet = map.entrySet();
  1. for the purpose of
for (Map.Entry<String, Integer> entry : entrySet) {
    String key = entry.getKey();
    Integer value = entry.getValue();
    System.out.println("键：" + key + "，值：" + value);
}

During the iteration process, you can use the getKey() method to retrieve the key and the getValue() method to retrieve the value.

The collection returned by the entrySet() method is closely linked to the original Map collection, modifying elements within it will affect the corresponding elements in the original Map collection.

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