package Collection; import java.util.HashMap; import java.util.Map; public class HashMapTest extends HashMap{ public static void main(String[] args) { int n = 3 - 1; n |= n >>> 1; System.out.println(n); HashMap map=new HashMap(); map.put("1", "1"); map.put("3", "3"); map.put("2", "2"); map.put("4", "4"); map.put("5", "4"); for(Map.Entry entry: map.entrySet()){ System.out.println(entry.getKey()+":"+entry.getValue()); } for(String str:map.values()){ System.out.println(str); } } }