HashMap: keySet() : HashMap « java.util « Java by API






  1. Java by API
  2. java.util
  3. HashMap

HashMap: keySet()

 


import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

public class Main {
  public static void main(String[] args) {
    HashMap<String, String> hMap = new HashMap<String, String>();

    hMap.put("1", "One");
    hMap.put("2", "Two");
    hMap.put("3", "Three");

    Set st = hMap.keySet();
    Iterator itr = st.iterator();

    while (itr.hasNext())
      System.out.println(itr.next());

    // remove 2 from Set
    st.remove("2");

    System.out.println(hMap.containsKey("2"));
  }
}








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4.HashMap: containsKey(Object key)
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6.HashMap: entrySet()
7.HashMap: get(E o)
8.HashMap: put(E o, E o1)
9.HashMap: putAll(Map m)
10.HashMap: remove(Object key)
11.HashMap: size()
12.HashMap: values()