test Iterator of HashMap - Java Collection Framework

Java examples for Collection Framework:HashMap

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Description

test Iterator of HashMap

Demo Code


import java.util.HashMap;
import java.util.Map;

public class Main {

  public static void main(String[] args) {
    System.out.println("--testIterator--");
    String k1 = "b2";
    String k2 = "aQ";
    Map<String, String> map = new HashMap<String, String>();
    map.put(k1, "v1");
    map.put(k2, "v2");
    map.put("k3", "v3");
    map.put("k4", "v4");
    map.put("k5", "v5");
    for (Map.Entry<String, String> entry : map.entrySet())
    {//from w w  w . j a va 2s.co  m
        System.out.println(entry.getKey());
    }
    
    for (String key : map.keySet())
    {
        System.out.println(key);
        System.out.println(map.get(key));
    }
    
    for (String key : map.values())
    {
        System.out.println(key);
        System.out.println(map.get(key));
    }
  }
}

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