trier un tableau de string java

1Arrays.sort(names, 0, names.length, Collections.reverseOrder());
2System.out.println("String array after sorting in descending order : " + Arrays.toString(names));
3

1import java.util.*;
2import java.lang.*;
3import java.io.*;
4import java.util.Arrays;
5 
6class Ideone
7{
8    public static void main (String[] args) throws java.lang.Exception
9    {
10        final String[] data = new String[] {"Raaata", "Tatatara", "Ratatouille", "Gygyghhhygra", "Bla", "Toto"};
11        Arrays.sort(data, new Comparator<String>() {
12            public int compare(String s1, String s2) {
13                int idx1 = s1.toLowerCase().indexOf("ra");
14                int idx2 = s2.toLowerCase().indexOf("ra");
15                if(idx1 == -1) {
16                    idx1 = Integer.MAX_VALUE;
17                }
18                if(idx2 == -1) {
19                    idx2 = Integer.MAX_VALUE;
20                }
21                Integer i1 = new Integer(idx1);
22                Integer i2 = new Integer(idx2);
23                return i1.compareTo(i2);
24            }
25        });
26        System.out.println("Sorted array=" + Arrays.toString(data));
27    }
28}
29

1String[] names = {"John", "Steve", "Shane", "Adam", "Ben"};
2System.out.println("String array before sorting : " + Arrays.toString(names));
3Arrays.sort(names); 
4System.out.println("String array after sorting in ascending order : " + Arrays.toString(names));
5

1import java.util.*;
2import java.lang.*;
3import java.io.*;
4import java.util.Arrays;
5  
6class Ideone
7{
8    public static void main (String[] args) throws java.lang.Exception
9    {
10        final String[] data = new String[] {"Raaata", "Tatatara", "Ratatouille", "Gygyghhhygra", 
11            "Rasatouille", "Paratouille", "Parasouille", "Bla", "Toto"};
12        Arrays.sort(data, new Comparator<String>() {
13            @Override
14            public int compare(String s1, String s2) {
15                int idx1 = s1.toLowerCase().indexOf("ra");
16                int idx2 = s2.toLowerCase().indexOf("ra");
17                if(idx1 == -1 || idx2 == -1) {
18                    if(idx1 == -1) {
19                        idx1 = Integer.MAX_VALUE;
20                    }
21                    if(idx2 == -1) {
22                        idx2 = Integer.MAX_VALUE;
23                    }
24                } else if(idx1 == idx2) {
25                    return s1.substring(idx1).compareTo(s2.substring(idx2));
26                }
27                 
28                Integer i1 = new Integer(idx1);
29                Integer i2 = new Integer(idx2);
30                return i1.compareTo(i2);
31            }
32        });
33        System.out.println("Sorted array=" + Arrays.toString(data));
34    }
35}
36

1import java.util.Arrays;
2
3// creating an array with integers
4int[] array = {7, 4, 2, 1, 19};
5// this is the sorting part just one function ready to be used
6Arrays.sort(array);
7// prints [1, 2, 4, 7, 19]
8System.out.println(Arrays.toString(array));
9

1// How to Sort Object Array in Java using Comparator and Comparable
2Course[] courses = new Course[4];
3courses[0] = new Course(101, "Java", 200);
4courses[1] = new Course(201, "Ruby", 300);
5courses[2] = new Course(301, "Python", 400);
6courses[3] = new Course(401, "Scala", 500);
7       
8System.out.println("Object array before sorting : " + Arrays.toString(courses));
9       
10Arrays.sort(courses);
11System.out.println("Object array after sorting in natural order : " + Arrays.toString(courses));
12       
13Arrays.sort(courses, new Course.PriceComparator());
14System.out.println("Object array after sorting by price : " + Arrays.toString(courses));
15       
16Arrays.sort(courses, new Course.NameComparator());
17System.out.println("Object array after sorting by name : " + Arrays.toString(courses));
18

1int compare(T o1,
2          T o2)
3 
4Retourne un entier négatif (<0), zéro ou un entier positif (>0) si le premier argument est plus petit, égale à ou plus grand que le deuxième argument.
5