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Sort HashMap based on keys in Java
Firstly, create a HashMap −
HashMap hm = new HashMap();
Add some elements to the HashMap −
hm.put("Shirts", new Integer(700));
hm.put("Trousers", new Integer(600));
hm.put("Jeans", new Integer(1200));
hm.put("Android TV", new Integer(450));
hm.put("Air Purifiers", new Integer(300));
hm.put("Food Processors", new Integer(950));Now, sort the HashMap based on keys using TreeMap −
Map<String, String> sort = new TreeMap<String, String>(hm);
System.out.println("Sorted Map based on key = "+sort);The following is an example to sort HasMap based on keys −
Example
import java.util.*;
public class Demo {
public static void main(String args[]) {
HashMap hm = new HashMap();
hm.put("Shirts", new Integer(700));
hm.put("Trousers", new Integer(600));
hm.put("Jeans", new Integer(1200));
hm.put("Android TV", new Integer(450));
hm.put("Air Purifiers", new Integer(300));
hm.put("Food Processors", new Integer(950));
System.out.println("Map = "+hm);
Map<String, String> sort = new TreeMap<String, String>(hm);
System.out.println("Sorted Map based on key = "+sort);
}
}Output
Map = {Shirts=700, Food Processors=950, Air Purifiers=300, Jeans=1200, Android TV=450, Trousers=600}
Sorted Map based on key = {Air Purifiers=300, Android TV=450, Food Processors=950, Jeans=1200, Shirts=700, Trousers=600}
Updated on: 30-Jul-2019
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