CODEWITHSUNDEEP
javacollections
DesirePRG
DesirePRG

Reputation: 6388

What is the best way to print elements of a Collection class?

I am playing around with the Collection API in java, and came through two different ways to print out the elements in the collection. I need to know which would be the best method to be used in any situation.

The first method is to use .toString() method (implicitly) in Collection interface. The second method is to use iterators and visit each element and print it out. (This code is commented) 

public class Test  {

    static Set<String> mySet1 = new HashSet<>();
    static Set<String> mySet2 = new LinkedHashSet<>();

    public static void main(String[] args) {

       String[] arr = {"hello","world","I","am","Tom"};
       for(int i=0; i<arr.length;i++){
           mySet1.add(arr[i]);
           mySet2.add(arr[i]);
       }

       System.out.println("HashSet prinitng...");
      /* Iterator iter1 = mySet1.iterator();
       while(iter1.hasNext()){
           System.out.println(iter1.next());
       }*/

       System.out.println(mySet1);

       System.out.println("LinkedHashSet printing");
       /*
       Iterator iter2 = mySet2.iterator();
       while(iter2.hasNext()){
           System.out.println(iter2.next());
       }*/

       System.out.println(mySet2);
    }
}

Which is better and why?

Upvotes: 0

Views: 214

Answers (1)

Maroun
Maroun

Reputation: 95998

In Java 8, you can simply:

mySet2.forEach(System.out::println);

In earlier versions:

for (String str : mySet2)
    System.out.println(str);

Upvotes: 2

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