We can create TreeSet with custom comparator in Java.
// A reverse comparator for strings. class MyComp implements Comparator<String> { public int compare(String aStr, String bStr) { // Reverse the comparison. return bStr.compareTo(aStr); } /*from w w w . ja v a2s .c om*/ // No need to override equals or the default methods. } TreeSet<String> ts = new TreeSet<String>(new MyComp());
Full source
// Use a custom comparator. import java.util.*; // A reverse comparator for strings. class MyComp implements Comparator<String> { public int compare(String aStr, String bStr) { // Reverse the comparison. return bStr.compareTo(aStr); } //from w ww . j a v a 2s . co m // No need to override equals or the default methods. } public class Main { public static void main(String args[]) { // Create a tree set. TreeSet<String> ts = new TreeSet<String>(new MyComp()); // Add elements to the tree set. ts.add("HTML"); ts.add("CSS"); ts.add("demo2s.com"); ts.add("Java"); ts.add("Javascript"); ts.add("Dart"); // Display the elements. for(String element : ts) System.out.print(element + " "); System.out.println(); } }