Detailed explanation of the use of the Java sorting method sort

Forgot where the down note came from. . .

Detailed explanation of the use of the Java sorting method sort

Sort an array:

// sort the array
public void arraySort(){
    int[] arr = {1,4,6,333,8,2};
    Arrays.sort(arr);// Use the sort method of the java.util.Arrays object
    for(int i=0;i<arr.length;i++){
        System.out.println(arr[i]);
    }
}

Sort the collection:

// sort the list in ascending order
    public void listSort1(){
        List<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(55);
        list.add(9);
        list.add(0);
        list.add(2);
        Collections.sort(list);// Use the sort method of Collections
        for(int a :list){
            System.out.println(a);
        }
    }
    // sort the list in descending order
    public void listSort2(){
        List<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(55);
        list.add(9);
        list.add(0);
        list.add(2);
        Collections.sort(list, new Comparator<Integer>() {
            public int compare(Integer o1, Integer o2) {
                return o2 - o1;
            }
        });// Use the sort method of Collections and override the compare method
        for(int a :list){
            System.out.println(a);
        }
    }<br> Note: The default sorting method of Collections is ascending order. If you need to sort in descending order, you need to override the compare method.