how to add some other collection to the HashSet using collections in java
how to add some other collection to the HashSet using collections in java
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package r4r.co.in;
import java.util.*;
public class CollectionExample {
/**
* @param args
*/
public static void main(String[] args)
{
// TODO Auto-generated method stub
ArrayList<Integer> al=new ArrayList<Integer>(); // creating an ArrayList of Integer elements
al.add(56); // adding elements to the arraylist
al.add(72);
al.add(97);
System.out.println("The contents of the ArrayList are: "+al);
HashSet<Integer> set=new HashSet<Integer>(); // creating a HashSet named set
set.add(1); // adding elements to the HashSet
set.add(3);
set.add(4);
set.add(5);
set.add(7);
set.add(1);
set.add(4);
set.add(7);
System.out.println("The contents of the set are:"); //displaying the contents of the HashSet
System.out.println(set);
set.addAll(al); // Adding the ArrayList to the HashSet set
System.out.println("The contents of set after adding Arraylist is: "+set); // displaying the resultant collection HashSet
}
}
The output of the above written code is as follows:
The contents of the ArrayList are: [56, 72, 97]
The contents of the set are:
[1, 3, 4, 5, 7]
The contents of set after adding Arraylist is: [1, 3, 4, 5, 97, 7, 56, 72]
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