[Java]字符串數組 與 字符串鏈表 之間的相互轉化

        String[] arr= {"Felix","Einstein","Douglas","Cindy","Bill","Andy"};
        
        List<String> readonlyList=Arrays.asList(arr);// Arrays.asList方法可以將數組直接轉化為鏈表,但此鏈表變成了‘只讀鏈表’，不能再使用add/remove方法，使用會導致ava.lang.UnsupportedOperationException異常
        Collections.sort(readonlyList);// 使用Collections.sort對鏈表進行排序
        System.out.print(String.join(",", readonlyList)+"\n");
        
        String[] arr2=readonlyList.toArray(new String[readonlyList.size()]);// 將字符串鏈表轉化為字符串數組
        System.out.print(String.join(";", arr2));
        
        //System.out.println("list size="+readonlyList.size());
        //readonlyList.remove(0);// list.add("ttt");// Arrays.asList之后的鏈表是‘只讀鏈表’，不能改變
        System.out.println("list size="+readonlyList.size());
        
        List<String> rwList = new ArrayList<String>(Arrays.asList(arr));// 數組到鏈表轉型的正確方法
        rwList.add("QiangDong Liu");
        rwList.add("Jack Ma");
        rwList.add("Pony Ma");
        rwList.remove(0);
        System.out.print(String.join(",", rwList)+"\n");

輸出：

Andy,Bill,Cindy,Douglas,Einstein,Felix
Andy;Bill;Cindy;Douglas;Einstein;Felixlist size=6
Bill,Cindy,Douglas,Einstein,Felix,QiangDong Liu,Jack Ma,Pony Ma

--END-- 2019-12-25 16:28