@Test
public void run()
{
ArrayList<String> list= new ArrayList<String>();
list.add( "美女");
list.add( "帅哥");
list.add( "芙蓉姐姐" );
for (int i = 0; i < list.size(); i++) {
String str=list.get(i);
System. out.println(str);
}
System. out.println("==============================================" );
for(String str:list)
{
System. out.println(str);
}
System. out.println("==================使用迭代器========================" );
Iterator<String> it=list.iterator();
while(it.hasNext())
{
System. out.println(it.next());
}
}
@Test
public void run1()
{
Set<String>set= new HashSet<String>();
set.add( "aaaaaaaa");
set.add( "bbbbbbbb");
set.add( "cccccccc");
set.add( "dddddddd");
Iterator <String> iset=set.iterator();
while(iset.hasNext())
{
System. out.println(iset.next());
}
}
@Test
public void run2()
{
Map<String,Integer> map= new HashMap<String,Integer>();
map.put( "name", 1);
map.put( "Height", 175);
map.put( "Weight", 68);
Set<String>set=map.keySet();
for (String key:set) {
Integer value=map.get(key);
System. out.println(key +"==>>" +value);
}
Set<Entry<String,Integer>> entrys=map.entrySet();
for(Entry<String,Integer> entry :entrys)
{
System. out.println(entry.getKey()+entry.getValue());
}
}
