Defining new set java

In Java, a set is a collection of unique elements, which means that it does not allow duplicate values. Here's how you can define a new set in Java:

Using the HashSet class:

import java.util.HashSet;

public class MySet {
    public static void main(String[] args) {
        // Create a new set
        HashSet<String> mySet = new HashSet<>();

        // Add elements to the set
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");
        mySet.add("banana"); // duplicate, will be ignored

        // Print the set
        System.out.println(mySet);
    }
}

In this example, we create a new HashSet object called mySet and add some elements to it. The HashSet class uses a hash table to store its elements, which means that it has a fast lookup time and does not allow duplicate values.

Using the TreeSet class:

import java.util.TreeSet;

public class MySet {
    public static void main(String[] args) {
        // Create a new set
        TreeSet<String> mySet = new TreeSet<>();

        // Add elements to the set
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");
        mySet.add("banana"); // duplicate, will be ignored

        // Print the set
        System.out.println(mySet);
    }
}

In this example, we create a new TreeSet object called mySet and add some elements to it. The TreeSet class uses a tree data structure to store its elements, which means that it is sorted by default and does not allow duplicate values.

Using the LinkedHashSet class:

import java.util.LinkedHashSet;

public class MySet {
    public static void main(String[] args) {
        // Create a new set
        LinkedHashSet<String> mySet = new LinkedHashSet<>();

        // Add elements to the set
        mySet.add("apple");
        mySet.add("banana");
        mySet.add("orange");
        mySet.add("banana"); // duplicate, will be ignored

        // Print the set
        System.out.println(mySet);
    }
}

In this example, we create a new LinkedHashSet object called mySet and add some elements to it. The LinkedHashSet class uses a combination of a hash table and a linked list to store its elements, which means that it preserves the order in which elements were added and does not allow duplicate values.

Note that all three classes (HashSet, TreeSet, and LinkedHashSet) implement the Set interface, which means that they share a common set of methods and behavior.