Java中实现list显示的三种方法

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;public class TestList {
     private List list = new ArrayList(); 

       private void initializelist() { 
 
         for (int i = 1; i < 5; i++) { 
 
             list.add("111"); 
 
         } 
 
     } 
 

       private void showIterator() { 
 
         for (Iterator it = list.iterator(); it.hasNext();) { 
 
             String str = (String) it.next(); 
 
             System.out.println(str); 
 
         } 
 
     } 
 

       private void showlistwhile() { 
 
         Iterator it = list.iterator(); 
 
         while (it.hasNext()) { 
 
             String str = (String) it.next(); 
 
             System.out.println(str); 
 
         } 
 

       } 

 

       private void showlistsize() { 
 
         for (int i = 0; i < list.size(); i++) { 
 
             String str = list.get(i).toString(); 
 
             System.out.println(str); 
 
         } 
 
     } 
 

       public static void main(String[] args) { 
 
         TestList testlist = new TestList(); 
 
         testlist.initializelist(); 
 
//         testlist.showIterator(); 
 
//         testlist.showlistlength(); 
 
         testlist.showlistwhile(); 
 
     } 
 

  }