Programa Java para iterar elementos LinkedHashSet

LinkedHashSet es una versión ordenada de HashSet que mantiene una lista doblemente vinculada en todos los elementos. Cuando se necesita mantener el orden de iteración, se utiliza esta clase. Al iterar a través de un HashSet , el orden es impredecible, mientras que un LinkedHashSet nos permite iterar a través de los elementos en el orden en que se insertaron. Al recorrer LinkedHashSet con un iterador, los elementos volverán al orden en que se insertaron.

Diferentes formas de iterar elementos LinkedHashSet:

1. Usando el ciclo for-each
2. Usar iteradores
3. Uso de secuencias JDK 1.8

Método 1: usar el ciclo for-each

// Java Program to Iterate LinkedHashSet Elements
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class GFG {
    // Main driver method
    public static void main(String[] args)
        throws java.lang.Exception
    {
        // Creating a LinkedHashSet
        LinkedHashSet<Integer> hashSet
            = new LinkedHashSet<Integer>();
 
        // Adding elements to LinkedHashSet
        // Custom inputs
        hashSet.add(1);
        hashSet.add(2);
        hashSet.add(3);
        hashSet.add(4);
        hashSet.add(5);
 
        // Iteration over HashSet
        // using for-each loop
        for (Integer element : hashSet)
 
            // Print the elements of LinkedHashSet created above
            System.out.println("Element is " + element);
    }
}

Element is 1
Element is 2
Element is 3
Element is 4
Element is 5

Método 2: usar iteradores

// Java Program to Iterate LinkedHashSet Elements
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class GFG {
    // Main driver method
    public static void main(String[] args)
        throws java.lang.Exception
    {
        // Creating a LinkedHashSet
        LinkedHashSet<Integer> hashSet
            = new LinkedHashSet<Integer>();
 
        // Adding elements to LinkedHashSet
        Custom inputs hashSet.add(1);
        hashSet.add(2);
        hashSet.add(3);
        hashSet.add(4);
        hashSet.add(5);
 
        // Method returning iterator of same elements
        // as in above LinkedHashSet
        Iterator iter = hashSet.iterator();
 
        // Condition check
        // hasNext() method returns true
        // if iterator has more elements to iterate
        // else returns false (where cond violates)
        while (iter.hasNext())
 
            // Print all the elements of LinkedHashSet
            // using next() method
            System.out.println("Element is " + iter.next());
    }
}

Element is 1
Element is 2
Element is 3
Element is 4
Element is 5

Método 3: Uso de secuencias JDK 1.8

// Java Program to Iterate LinkedHashSet Elements
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class GFG {
   
    // Main driver method
    public static void main(String[] args)
        throws java.lang.Exception
    {
        // Creating a LinkedHashSet
        LinkedHashSet<Integer> hashSet
            = new LinkedHashSet<Integer>();
 
        // Adding elements to LinkedHashSet
        // Custom inputs
        hashSet.add(1);
        hashSet.add(2);
        hashSet.add(3);
        hashSet.add(4);
        hashSet.add(5);
 
        // Method returning iterator of same elements
        // as in above LinkedHashSet
        Iterator iter = hashSet.iterator();
 
        // Stream API used to process collection
        // of objects
 
        // Iterating using for-each
        hashSet.stream().forEach(element -> {
           
            // Print all elements of LinkedHashSet
            System.out.println("Element is  " + element);
        });
    }
}

Element is  1
Element is  2
Element is  3
Element is  4
Element is  5