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Sort items in a Java TreeSet
First, create a TreeSet and add elements to it −
TreeSet<String> set = new TreeSet<String>();
set.add("65");
set.add("45");
set.add("19");
set.add("27");
set.add("89");
set.add("57");Now, sort it in ascending order, which is the default −
Iterator<String> i = set.iterator();
while(i.hasNext()){
System.out.println(i.next());
}If you want to sort in descending order, then use the descendingIterator() method −
Iterator<String> j = set.descendingIterator();
while(j.hasNext()) {
System.out.println(j.next());
}The following is an example to sort items in a TreeSet in ascending and descending order −
Example
import java.util.*;
public class Demo {
public static void main(String args[]){
TreeSet<String> set = new TreeSet<String>();
set.add("65");
set.add("45");
set.add("19");
set.add("27");
set.add("89");
set.add("57");
System.out.println("TreeSet elements (Sorted)...");
Iterator<String> i = set.iterator();
while(i.hasNext()) {
System.out.println(i.next());
}
System.out.println("
TreeSet elements (Sorted) in Descending order...");
Iterator<String> j = set.descendingIterator();
while(j.hasNext()) {
System.out.println(j.next());
}
}
}Output
TreeSet elements (Sorted)... 19 27 45 57 65 89 TreeSet elements (Sorted) in Descending order... 89 65 57 45 27 19
Updated on: 30-Jul-2019
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