Convert HashSet to TreeSet in Java

At first, create a HashSet with string values −

HashSet<String> hashSet = new HashSet<String>();
hashSet.add("Bradley");
hashSet.add("Katie");
hashSet.add("Brad");
hashSet.add("Amy");
hashSet.add("Ryan");
hashSet.add("Jamie");

Now, convert the HashSet to TreeSet −

Set<String> set = new TreeSet<String>(hashSet);

Example

Following is the program to convert HashSet to TreeSet in Java −

import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;
public class Demo {
   public static void main(String[] args) {
      HashSet<String> hashSet = new HashSet<String>();
      hashSet.add("Bradley");
      hashSet.add("Katie");
      hashSet.add("Brad");
      hashSet.add("Amy");
      hashSet.add("Ryan");
      hashSet.add("Jamie");
      hashSet.add("Kevin");
      hashSet.add("David");
      System.out.println("HashSet = "+ hashSet);
      Set<String> set = new TreeSet<String>(hashSet);
      System.out.println("TreeSet = "+set);
   }
}

Output

HashSet = [Kevin, Jamie, Ryan, Bradley, Katie, David, Brad, Amy]
TreeSet = [Amy, Brad, Bradley, David, Jamie, Katie, Kevin, Ryan]

AmitDiwan

Published on 25-Sep-2019 12:12:10