TreeMap size()

int size()
Returns the number of key-value mappings in this map.
 
import java.util.TreeMap;

public class Main {
  public static void main(String[] args) {
    TreeMap<String,String> treeMap = new TreeMap<String,String>();
    treeMap.put("1", "One");
    treeMap.put("2", "Two");
    treeMap.put("3", "Three");

    treeMap.clear();
    System.out.println(treeMap.size());
  }
}
  
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TreeMap:
  1. TreeMap Class
  2. new TreeMap<K, V> ()
  3. entrySet()
  4. firstKey()
  5. get(K k)
  6. headMap(K toKey)
  7. headMap(K toKey, boolean inclusive)
  8. higherKey(K key)
  9. lastKey()
  10. lowerKey(K key)
  11. put(K k, V v)
  12. TreeMap size()
  13. subMap(K fromKey, K toKey)
  14. tailMap(T fromKey)
  15. TreeMap values()