/*********************************************************
function:set and array Convert each other with java sample
file    :setAndArray.java
author  :chinayaosir   QQ:44633197
Tools   :MyEclipse Version: 6.0.1 GA
date    :10/26/2010
blog    :http://blog.csdn.net/chinayaosir
note    :禁止其它网站转载此文章
*********************************************************/

import java.util.*;
public class setAndArray {

  public static void main(String[] args) {
      listToSet();
      arrayListToHashSet();
      setToArray1();
      setToArray2();
  }
 
  public static void listToSet() {
        List<String> myList = new ArrayList<String>();
        myList.add("AA ");
        myList.add("BB ");
        myList.add("CC ");
        myList.add("DD ");

        Set<String> mySet = new HashSet<String>(myList);
        System.out.println("listToSet");
        for (Object theFruit : mySet)
          {System.out.print(theFruit);}
        System.out.println(" ");
       
      } 

 
  public static void arrayListToHashSet() {
        List<String> myList = new ArrayList<String>();
        myList.add("AA ");
        myList.add("BB ");
        myList.add("CC ");
        myList.add("DD ");

        Set<String> mySet = new HashSet<String>(myList);
        System.out.println("arrayListToHashSet");
        for (Object theFruit : mySet)
          {System.out.print(theFruit);}
        System.out.println(" ");       
      } 
 
  public static void setToArray1(){
        //set create and set some value
        Set<String> set = new TreeSet<String>();
        set.add("bb ");
        set.add("cc ");
        set.add("aa ");
        //create array with set.size,then get value from set
        String[] array = (String[]) set.toArray(new String[set.size()]);
        Arrays.toString(array);
        System.out.println("setToArray");
        for (Object theFruit : array)
          {System.out.print(theFruit);}
        System.out.println(" ");   
  }
 
  public static void setToArray2(){
        //set create and set different data type value
        Set<Object> set = new HashSet<Object>();
        set.add("A "); //string
        set.add(new Long(10)); //long
        set.add(new Date());    //date
        //create list with set,list save into Objects array
        List<Object> list = new ArrayList<Object>(set);
        Object[] objects = list.toArray();
        System.out.println("SetToArray With different datatype");
        for (int i = 0; i < objects.length; i++) {
          Object object = objects[i];
          System.out.println("Object = " + object);
        }
    } 
}
/*code run value ,pls see below
listToSet
AA BB CC DD 
arrayListToHashSet
AA BB CC DD 
setToArray
aa bb cc 
SetToArray With different datatype
Object = Tue Oct 26 11:18:19 CST 2010
Object = A
Object = 10
 *
 **/