Java SortedMap.firstKey()
Syntax
SortedMap.firstKey() has the following syntax.
K firstKey()
Example
In the following code shows how to use SortedMap.firstKey() method.
/*w w w.j av a2 s . co m*/
import java.util.SortedMap;
import java.util.TreeMap;
public class Main {
public static void main(String[] args) {
SortedMap<String, Integer> sortedMap = new TreeMap<String, Integer>();
sortedMap.put("A", 1);
sortedMap.put("B", 2);
sortedMap.put("C", 3);
sortedMap.put("D", 4);
sortedMap.put("E", 5);
sortedMap.put("java2s", 6);
System.out.println(sortedMap.firstKey());
}
}
The code above generates the following result.
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