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Java Program to convert HashMap to TreeMap
To convert HashMap to TreeMap, let us first create a Map with key-value pair −
Map<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("2", "B");
map.put("3", "C");
map.put("4", "D");
map.put("5", "E");
map.put("6", "F");
map.put("7", "G");Now, convert the above HashMap to TreeMap −
Map<String, String>sorted = new TreeMap<String, String>(map);
Example
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
public class Demo {
public static void main(String[] a) {
Map<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("2", "B");
map.put("3", "C");
map.put("4", "D");
map.put("5", "E");
map.put("6", "F");
map.put("7", "G");
map.put("8", "H");
map.put("9", "I");
Map<String, String>sorted = new TreeMap<String, String>(map);
System.out.println("Sorted Map = "+sorted);
}
}Output
Sorted Map = {1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H, 9=I}
Updated on: 30-Jul-2019
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