List.toArray(),Arrays.sort(), Collections.sort()

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    public static void main(String[] args) {        Double d1 = 4.0;        Double d2 = 3.0;        System.out.println(d1.compareTo(d2));        System.out.println("-----------------------------------------");        String[] arrString = new String[]{"qwe","Afd","cfd","123"};        Arrays.sort(arrString);        for(int i=0;i<arrString.length;i++){            System.out.println(arrString[i]);        }        System.out.println("-----------------------------------------");        List<String> list = new ArrayList<String>();        list.add("123");        list.add("asd");        list.add("wed");        list.add("QWEW");        Collections.sort(list);        for(int i=0;i<list.size();i++){            System.out.println(list.get(i));        }        System.out.println("-----------------------------------------");        String[] convertArray = list.toArray(new String[list.size()]);        for(int i=0;i<convertArray.length;i++){            System.out.println(convertArray[i]);        }    }//main

1-----------------------------------------123Afdcfdqwe-----------------------------------------123QWEWasdwed-----------------------------------------123QWEWasdwed

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