how to sort array java

1import java. util. Arrays;
2Arrays. sort(array);

1// java sort arraylist
2import java.util.ArrayList;
3import java.util.Collections;
4public class JavaSortArraylist 
5{
6   public static void main(String[] args) 
7   {
8      ArrayList<String> al = new ArrayList<String>();
9      al.add("Bear"); 
10      al.add("Fox"); 
11      al.add("Deer"); 
12      al.add("Cheetah"); 
13      al.add("Anteater");
14      al.add("Elephant");
15      System.out.println("Before sorting ArrayList: " + al);
16      Collections.sort(al); 
17      System.out.println("After sorting ArrayList in Ascending order: " + al);
18   }
19}

1enum Code {
2    Str1(1), Str2(2), Str3(3), Str4(4), Str5(5));
3
4    int sortNumber;
5
6    Code(int sortNumber) {
7        this.sortNumber = sortNumber;
8    }
9
10    int returnNumber() {
11        return sortNumber;
12    }
13};
14
15public static void main(String[] args) {
16    List<Object> obj = new ArrayList<Object>();
17
18    Collections.sort(obj, new Comparator<Object>() {
19        @Override
20        public int compare(Object object1, Object object2) {
21            return Code.valueOf(object1.getStr()).returnNumber() > Code.valueOf(object2.getStr()).returnNumber() ? 1 : -1;
22        }
23    });
24}

1// how to sort an array of strings in descending
2import java.util.Arrays;
3import java.util.Collections;
4public class SortStringAlphabeticalOrder 
5{
6   public static void main(String[] args) 
7   {
8      String[] strDesc = {"Bear","Fox","Deer","Cheetah","Anteater","Elephant"};
9      System.out.println("Before sorting: ");
10      for(String string : strDesc)
11      {
12         System.out.println(string);
13      }
14      // arrays.sort
15      Arrays.sort(strDesc, Collections.reverseOrder());   
16      System.out.println("-----------------------------------");
17      System.out.println("Sorting string array in descending or reverse order: ");
18      for(String string : strDesc)
19      {
20         System.out.println(string);
21      }
22   }
23}

1// java sort array of objects
2import java.util.Arrays;
3public class Employee implements Comparable<Employee>
4{
5   private String empName; 
6   private int empAge;
7   public Employee(String name, int age) 
8   { 
9      this.empName = name; 
10      this.empAge = age; 
11   }
12   @Override 
13   public String toString() 
14   { 
15      return "{" + "name='" + empName + '\'' + ", age=" + empAge + '}'; 
16   }
17   public String getName() 
18   { 
19      return empName; 
20   }
21   public int getAge() 
22   { 
23      return empAge; 
24   }
25   @Override 
26   public int compareTo(Employee o) 
27   { 
28      if(this.empAge != o.getAge()) 
29      { 
30         return this.empAge - o.getAge(); 
31      }
32      return this.empName.compareTo(o.getName()); 
33   }
34}
35public class SortArrayObjects 
36{
37   public static void main(String[] args) 
38   {
39      Employee[] obj = { new Employee("virat", 25), new Employee("dhoni", 20), 
40                         new Employee("rohit", 22), new Employee("rahul", 24)};
41      Arrays.sort(obj); 
42      System.out.println(Arrays.toString(obj));
43   }
44}

1int[] array = new int[10];
2Random rand = new Random();
3for (int i = 0; i < array.length; i++)
4    array[i] = rand.nextInt(100) + 1;
5Arrays.sort(array);
6System.out.println(Arrays.toString(array));
7// in reverse order
8for (int i = array.length - 1; i >= 0; i--)
9    System.out.print(array[i] + " ");
10System.out.println();
11