Java: Convert a hash set to a tree set
Write a Java program to convert a hash set to a tree set.
Sample Solution:
Java Code:
import java.util.*;
public class Exercise8 {
public static void main(String[] args) {
// Create a empty hash set
HashSet<String> h_set = new HashSet<String>();
// use add() method to add values in the hash set
h_set.add("Red");
h_set.add("Green");
h_set.add("Black");
h_set.add("White");
h_set.add("Pink");
h_set.add("Yellow");
System.out.println("Original Hash Set: " + h_set);
// Creat a TreeSet of HashSet elements
Set<String> tree_set = new TreeSet<String>(h_set);
// Display TreeSet elements
System.out.println("TreeSet elements: ");
for(String element : tree_set){
System.out.println(element);
}
}
}
Sample Output:
Original Hash Set: [Red, White, Pink, Yellow, Black, Green] TreeSet elements: Black Green Pink Red White Yellow
Pictorial Presentation:
Flowchart:

For more Practice: Solve these Related Problems:
- Write a Java program to convert a HashSet to a TreeSet and then print the elements in natural sorted order.
- Write a Java program to convert a HashSet to a TreeSet and verify that adding a new element maintains the sorted order.
- Write a Java program to compare the performance of converting a large HashSet to a TreeSet using different methods.
- Write a Java program to convert a HashSet to a TreeSet and then remove elements that do not meet a specified condition.
Java Code Editor:
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