arrays sort 28 29 in java

1// how to sort an array in java without using sort() method (ascending order)
2public class WithoutSortMethod
3{
4   public static void main(String[] args)
5   {
6      int temp;
7      int[] arrNumbers = {14, 8, 5, 54, 41, 10, 1, 500};
8      System.out.println("Before sort: ");
9      for(int num : arrNumbers)
10      {
11         System.out.println(num);
12      }
13      for(int a = 0; a < arrNumbers.length; a++)
14      {
15         for(int b = a + 1; b < arrNumbers.length; b++)
16         {
17            if(arrNumbers[a] > arrNumbers[b])
18            {
19               temp = arrNumbers[a];
20               arrNumbers[a] = arrNumbers[b];
21               arrNumbers[b] = temp;
22            }
23         }
24      }
25      System.out.println("---------------");
26      System.out.println("After sort: ");
27      for(int num : arrNumbers)
28      {
29         System.out.println(num);
30      }
31   }
32}

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}

1// how to sort an array in java without using sort method
2public class WithoutUsingSortMethod
3{
4   public static void main(String[] args) 
5   {
6      int temp;
7      int[] arrNumbers = {14, 8, 5, 54, 41, 10, 1, 500};
8      System.out.println("Before sort: ");
9      for(int num : arrNumbers)
10      {
11         System.out.println(num);
12      }
13      for(int a = 0; a <= arrNumbers.length - 1; a++)
14      {
15         for(int b = 0; b <= arrNumbers.length - 2; b++)
16         {
17            if(arrNumbers[b] < arrNumbers[b + 1])
18            {
19               temp = arrNumbers[b];
20               arrNumbers[b] = arrNumbers[b + 1];
21               arrNumbers[b + 1] = temp;
22            }
23         }
24      }
25      System.out.println("---------------");
26      System.out.println("After sort: ");
27      for(int num : arrNumbers)  
28      {
29         System.out.println(num);
30      }
31   }
32}

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 program to sort strings in an alphabetical order
2import java.util.Arrays;
3public class SortStringAlphabeticalOrder
4{
5   public static void main(String[] args)
6   {
7      String[] strAsc = {"Bear","Fox","Deer","Cheetah","Anteater","Elephant"};
8      System.out.println("Before sorting: ");
9      for(String string : strAsc)
10      {
11         System.out.println(string);
12      }
13      // arrays.sort
14      Arrays.sort(strAsc);
15      System.out.println("-----------------------------------");
16      System.out.println("After sorting: ");
17      for(String str : strAsc)
18      {
19         System.out.println(str);
20      }
21   }
22}

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}