setsexample.java

北京大学出版社的

package examples.collections;

import java.util.*;

/** A class to demonstrate the use of the Set
  * and SortedSet interfaces in the java.util package
  */
public class SetsExample {
   /** Test method for the class
     * @param args not used
     */
   public static void main( String[] args ) {
      // create a set and intialize it
      Set s1 = new HashSet();
      s1.add( new Integer( 6 ) );
      s1.add( new Integer( 100 ) );
      s1.add( new Integer( -89 ) );
      s1.add( new Integer( 2 ) );
      s1.add( new Integer( 57 ) );
      // iterate to display the set values
      Iterator i1 = s1.iterator();
      while ( i1.hasNext() ) {
         System.out.print( i1.next() + " " );
      }
      System.out.println();
      
      // create a SortedSet from a Set
      SortedSet s2 = new TreeSet( s1 );
      // iterate to display the set values
      Iterator i2 = s2.iterator();
      while ( i2.hasNext() ) {
         System.out.print( i2.next() + " " );
      }
      System.out.println();
   }
}