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Retrieve the first entry in the TreeMap in Java
Use the firstEntry() method in TreeMap to retrieve the first entry.
Create a TreeMap and add some elements
TreeMap<Integer, String> m = new TreeMap<Integer, String>(); m.put(1,"India"); m.put(2,"US"); m.put(3,"Australia"); m.put(4,"Netherlands"); m.put(5,"Canada");
Now, retrieve the first entry
m.firstEntry()
The following is an example to retrieve first entry in the TreeMap
Example
import java.util.*; public class Demo { public static void main(String args[]){ TreeMap<Integer, String> m = new TreeMap<Integer, String>(); m.put(1,"India"); m.put(2,"US"); m.put(3,"Australia"); m.put(4,"Netherlands"); m.put(5,"Canada"); for(Map.Entry e:m.entrySet()){ System.out.println(e.getKey()+" "+e.getValue()); } System.out.println("First Entry in Map is "+m.firstEntry()); } }
Output
1 India 2 US 3 Australia 4 Netherlands 5 Canada First Entry in Map is 1=India
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