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Java Collection, TreeSet Exercises: Get an element in a tree set which is strictly less than the given element

Java Collection, TreeSet Exercises: Exercise-13 with Solution

Write a Java program to get an element in a tree set which is strictly less than the given element.

Sample Solution:

Java Code:

import java.util.TreeSet;
import java.util.Iterator;

  public class Exercise13 {
  public static void main(String[] args) {
 // creating TreeSet 
   TreeSet <Integer>tree_num = new TreeSet<Integer>();
   TreeSet <Integer>treeheadset = new TreeSet<Integer>();
     
   // Add numbers in the tree
   tree_num.add(10);
   tree_num.add(22);
   tree_num.add(36);
   tree_num.add(25);
   tree_num.add(16);
   tree_num.add(70);
   tree_num.add(82);
   tree_num.add(89);
   tree_num.add(14);
   
   System.out.println("Strictly less than 69 : "+tree_num.lower(69));
   System.out.println("Strictly less than 12 : "+tree_num.lower(12));
   }    
}

Sample Output:

Strictly less than 69 : 36                                             
Strictly less than 12 : 10

Flowchart:

Flowchart: Get an element in a tree set which is strictly less than the given element

Java Code Editor:

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Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt