Java Collection, TreeSet Exercises: Retrieve and remove the first element of a tree set
Java Collection, TreeSet Exercises: Exercise-14 with Solution
Write a Java program to retrieve and remove the first element of a tree set.
Sample Solution:
Java Code:
import java.util.TreeSet;
import java.util.Iterator;
public class Exercise14 {
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("Original tree set: "+tree_num);
System.out.println("Removes the first(lowest) element: "+tree_num.pollFirst());
System.out.println("Tree set after removing first element: "+tree_num);
}
}
Sample Output:
Original tree set: [10, 14, 16, 22, 25, 36, 70, 82, 89] Removes the first(lowest) element: 10 Tree set after removing first element: [14, 16, 22, 25, 36, 70, 82, 89]
Flowchart:
Java Code Editor:
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
Ref: https://bit.ly/32urdSe
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