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How to sort Map values by key in Java?
Let’s say the following is our Map with unsorted keys −
HashMap<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("6", "B");
map.put("3", "C");
map.put("7", "D");
map.put("5", "E");
map.put("2", "F");
map.put("4", "G");
map.put("8", "H");Now, sort the above Map. The result of tMap below would be a sorted map by key −
Map<String, String>tMap = 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[] args) {
HashMap<String, String>map = new HashMap<String, String>();
map.put("1", "A");
map.put("6", "B");
map.put("3", "C");
map.put("7", "D");
map.put("5", "E");
map.put("2", "F");
map.put("4", "G");
map.put("8", "H");
Map<String, String>tMap = new TreeMap<String, String>(map);
System.out.println("Sorted Map values: "+tMap);
}
}Output
{1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H}
Updated on: 30-Jul-2019
148 Views
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