Collections - Factory method for immutable Set using String java 9

ImmutableSet.java

package com.java9r;

import java.util.*;

public class ImmutableSet {

 public static void main(String[] args) {

  System.out.println("Products List");
  try {
   Set<String> products = Set.of("Product 1", "Product 2", "Product 3", "Product 4", "Product 5", "Product 5");
   products.forEach(product -> {
    System.out.print(product + "\n");

   });

  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}


 

Exception

Names List
Exception in thread "main" java.lang.IllegalArgumentException: duplicate element: Product 5
 at java.base/java.util.ImmutableCollections$SetN.<init>(Unknown Source)
 at java.base/java.util.Set.of(Unknown Source)
 at com.java9r.ImmutableSet.main(ImmutableSet.java:10)

 

ImmutableSet.java

package com.java9r;

import java.util.*;

public class ImmutableSet {

 public static void main(String[] args) {

  System.out.println("Products List");
  try {
   Set<String> products = Set.of("Product 1", "Product 2", "Product 3", "Product 4", "Product 5");
   products.forEach(product -> {
    System.out.print(product + "\n");

   });

  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

 

Output

Names List
Product 5
Product 2
Product 1
Product 4
Product 3