SortedSet: Object first() Returns this set's first element. : SortedSet « Utility Classes « SCJP

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SCJP » Utility Classes » SortedSet

8.18.1.SortedSet: Object first() Returns this set's first element.

import java.util.Iterator;

import java.util.Set;

import java.util.SortedSet;

import java.util.TreeSet;



public class MainClass {

  public static void main(String[] argv) {

    Set set = new TreeSet();

    set.add("1");

    set.add("2");

    set.add("3");



    Iterator it = set.iterator();

    while (it.hasNext()) {

      System.out.println(it.next());

    }



    SortedSet sortedSet = (SortedSet) set;



    System.out.println(sortedSet.first());

  }

}

8.18.SortedSet
	8.18.1.	SortedSet: Object first() Returns this set's first element.
	8.18.2.	SortedSet: Object last() Returns this set's last element.
	8.18.3.	SortedSet headSet(Object thru) Returns a sorted set containing this set's elements through the specified element.
	8.18.4.	SortedSet tailSet(Object from) Returns a sorted set containing this set's elements from the specified element through the end.
	8.18.5.	SortedSet subSet(Object from, Object to) Returns a sorted set containing this set's elements from from through to.

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