Map: containsKey(Object key) : Map « java.util « Java by API

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Java by API » java.util » Map

Map: containsKey(Object key)


 





import java.util.HashMap;

import java.util.Map;



class Counter {

  int i = 1;



  public String toString() {

    return Integer.toString(i);

  }

}



public class Main {

  public static void main(String[] args) {

    Map hm = new HashMap();

    for (int i = 0; i < 10; i++) {

      Integer r = new Integer(20);

      if (hm.containsKey(r))

        ((Counter) hm.get(r)).i++;

      else

        hm.put(r, new Counter());

    }

    System.out.println(hm);

  }

}

Related examples in the same category

1.	implements Map
2.	java.util.Map.Entry
3.	Map: clear()
4.	Map: containsValue(Object value)
5.	Map: equals(Object o)
6.	Map: get(Object key)
7.	Map.Entry: getKey()
8.	Map.Entry: getValue()
9.	Map: keySet()
10.	Map: put(T key, T value)
11.	Map: putAll(Map m)
12.	Map: remove(Object key)
13.	Map: size()
14.	Map: values()

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