Java TreeMap.keySet()
Syntax
TreeMap.keySet() has the following syntax.
public Set <K> keySet()
Example
In the following code shows how to use TreeMap.keySet() method.
import java.util.Set;
import java.util.TreeMap;
/* w w w. j a va 2 s.c om*/
public class Main {
public static void main(String[] args) {
TreeMap<Integer, String> treemap = new TreeMap<Integer, String> ();
// populating tree map
treemap.put(2, "two");
treemap.put(1, "one");
treemap.put(3, "three");
treemap.put(6, "six");
treemap.put(5, "from java2s.com");
// creating set
Set set=treemap.keySet();
// getting set view
System.out.println("Checking values of the set");
System.out.println("Value is: "+set);
}
}
The code above generates the following result.
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