List与数组转换

//字符数组转List

String[] s = {"a","b","c"}; 
List list= java.util.Arrays.asList(s); 

//List转字符数组——例子一

List<String> list = new ArrayList<String>();    
list.add("a1");    
list.add("a2");    
String[] toBeStored = list.toArray(new String[list.size()]);    
for(String s : toBeStored) {    
     System.out.println(s);    
}   

//List转字符数组——例子二

List<String> list = new ArrayList<String>();    
list.add("a1");    
list.add("a2");    
            
String[] toBeStored = new String[al.size()];    
list.toArray(toBeStored);    
for (String s : toBeStored) {    
    System.out.println(s);    
}   

//List转字符数组——例子三

List<String> list = new ArrayList<String>();    
list.add("a1");    
list.add("a2");    
            
String[] toBeStored = new String[]{};    
String[] str = al.toArray(toBeStored);    
for (String s : str) {    
              System.out.println(s);    
}   

利用此转化：

String str[] = list.toArray(new String[]{});   
List   list= java.util.Arrays.asList(String str[]);