Java Collection Tutorial - Java TreeSet.addAll(Collection <? extends E > c)

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Syntax

TreeSet.addAll(Collection <? extends E > c) has the following syntax.

public boolean addAll(Collection <? extends E> c)

Example

In the following code shows how to use TreeSet.addAll(Collection <? extends E > c) method.

//from   www  . j  a v  a  2  s  . c  o m
import java.util.Iterator;
import java.util.TreeSet;

public class Main {
   public static void main(String[] args) {
     
     TreeSet <Integer> treeone = new TreeSet<Integer> ();
     TreeSet <Integer> treetwo = new TreeSet<Integer> ();
     
     treeone.add(12);
     treeone.add(13);
     treeone.add(14);
     
     treetwo.add(15);
     treetwo.add(16);
     treetwo.add(17);  
     
     // adding treetwo to treeone
     treeone.addAll(treetwo);
     
     Iterator<Integer> iterator = treeone.iterator();
     
     while (iterator.hasNext()){
        System.out.print(iterator.next());
     }
   }    
}

The code above generates the following result.

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