Java Collection Tutorial - Java Map.size()

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Syntax

Map.size() has the following syntax.

int size()

Example

In the following code shows how to use Map.size() method.

 // w w w.  j  a v  a 2 s. c om
import java.util.HashMap;
import java.util.Map;

public class Main{
  public static void main(String[] a) {
    Map<String,String> map = new HashMap<String,String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");

    System.out.println(map.size());
  }
}
  

The code above generates the following result.

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