Examples with AbstractMap java.util.AbstractMap used on opensource projects

Example 46 with AbstractMap

use of java.util.AbstractMap in project Note-Java by ianlai.

the class HashMapUse method main.

public static void main(String[] args) {
    HashMap<String, Integer> map = new HashMap<String, Integer>();
    map.put("dog", 1);
    map.put("cat", 1);
    map.put("lion", 1);
    map.put("fish", 1);
    // null
    System.out.println(map.get("iii"));
    /* Use iterator to iterate the map */
    Iterator it = map.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry) it.next();
        System.out.println(pair.getKey() + " --- " + pair.getValue());
        System.out.println(pair.getKey().getClass().getName() + " --- " + pair.getValue().getClass().getName());
    }
    add("aa bb ccc dddd ee", "ccc bb ee");
    // ------------------------------------------
    /* We initiate a map with a concrete class */
    Map<Integer, Integer> mp1 = new HashMap<>();
// Map<Integer, Integer> mp2 = new Map<>();                        //Map is an interface
// Map<Integer, Integer> mp2 = new AbstractMap<Integer,Integer>(); //AbstractMap is an abstract class
}