Question

The aim of this lab is to learn the way of converting an ARRAY to a SET and the other way around. To complete this lab we need to remember the implementation of the Set Interface, HashSet Class, and Arrays.

1. Build an array with some elements (String, Integer, or Float).
2. Then initialize a set (using HashSet) with the elements of the converted array. To transfer an Array into a Set, firstly we have to convert it to a List using asList() method as HashSet accepts a List as a constructor.
3. Build a direct conversion over the same Array to be a Set by using the stream() method, instead of converting an Array to a List then to a Set as been done on Sept 2.

Answer 1

Java code for your requirements given below,

Java program:

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

public class ArrayToSet
{
public static void main(String aa[])
{
   String courses[]= {"cse","ece","eee","it","mech"};

//Convert using asList method
   Set<String> set = new HashSet<String>(Arrays.asList(courses));
   System.out.println(set);

//Convert using stream
   Set<String> set1= Arrays.stream(courses).collect(Collectors.toSet());
   System.out.println(set1);
  
}
}

Output should be displaying like this,

Note:

I printed set objects directly, If u want to print set values one by one use Iterator like this,

Iterator value=set.iterator();
   while(value.hasNext())
   {
       System.out.println(value.next());
   }