String str =" aa.png,a2.png,a3.png";String[] arrayStr =new String[]{};arrayStr = str.split(",");

List list = java.util.Arrays.asList(arrayStr);

String[] storeStr = list.toArray(new String[list.size()]);

public class SplitTest {    public static void main(String args[]) {      String str = "a1.png,a2.png,a3.png";// 原始字符串     String[] arrayStr = new String[] {};// 字符數組     List<String> list = new ArrayList<String>();// list      arrayStr = str.split(",");// 字符串轉字符數組     list = java.util.Arrays.asList(arrayStr);// 字符數組轉list     String[] storeStr = list.toArray(new String[list.size()]);// list轉成字符數組      /* 輸出字符數組的值 */     for (String s : arrayStr) {       System.out.println(s);      }     System.out.println("-------------");     /* 輸出list值 */     for (String s : list) {       System.out.println(s);      }     System.out.println("-------------");      for (String s : storeStr) {       System.out.println(s);      }     System.out.println("-------------");   } }