Arrays.sort() in java

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

// how to sort an array of strings in descending
import java.util.Arrays;
import java.util.Collections;
public class SortStringAlphabeticalOrder 
{
   public static void main(String[] args) 
   {
      String[] strDesc = {"Bear","Fox","Deer","Cheetah","Anteater","Elephant"};
      System.out.println("Before sorting: ");
      for(String string : strDesc)
      {
         System.out.println(string);
      }
      // arrays.sort
      Arrays.sort(strDesc, Collections.reverseOrder());   
      System.out.println("-----------------------------------");
      System.out.println("Sorting string array in descending or reverse order: ");
      for(String string : strDesc)
      {
         System.out.println(string);
      }
   }
}

// java program to sort strings in an alphabetical order
import java.util.Arrays;
public class SortStringAlphabeticalOrder
{
   public static void main(String[] args)
   {
      String[] strAsc = {"Bear","Fox","Deer","Cheetah","Anteater","Elephant"};
      System.out.println("Before sorting: ");
      for(String string : strAsc)
      {
         System.out.println(string);
      }
      // arrays.sort
      Arrays.sort(strAsc);
      System.out.println("-----------------------------------");
      System.out.println("After sorting: ");
      for(String str : strAsc)
      {
         System.out.println(str);
      }
   }
}

// how to sort an array in java without using sort method
public class WithoutUsingSortMethod
{
   public static void main(String[] args) 
   {
      int temp;
      int[] arrNumbers = {14, 8, 5, 54, 41, 10, 1, 500};
      System.out.println("Before sort: ");
      for(int num : arrNumbers)
      {
         System.out.println(num);
      }
      for(int a = 0; a <= arrNumbers.length - 1; a++)
      {
         for(int b = 0; b <= arrNumbers.length - 2; b++)
         {
            if(arrNumbers[b] < arrNumbers[b + 1])
            {
               temp = arrNumbers[b];
               arrNumbers[b] = arrNumbers[b + 1];
               arrNumbers[b + 1] = temp;
            }
         }
      }
      System.out.println("---------------");
      System.out.println("After sort: ");
      for(int num : arrNumbers)  
      {
         System.out.println(num);
      }
   }
}

// java sort arraylist
import java.util.ArrayList;
import java.util.Collections;
public class JavaSortArraylist 
{
   public static void main(String[] args) 
   {
      ArrayList<String> al = new ArrayList<String>();
      al.add("Bear"); 
      al.add("Fox"); 
      al.add("Deer"); 
      al.add("Cheetah"); 
      al.add("Anteater");
      al.add("Elephant");
      System.out.println("Before sorting ArrayList: " + al);
      Collections.sort(al); 
      System.out.println("After sorting ArrayList in Ascending order: " + al);
   }
}

// how to sort an array in java without using sort() method (ascending order)
public class WithoutSortMethod
{
   public static void main(String[] args)
   {
      int temp;
      int[] arrNumbers = {14, 8, 5, 54, 41, 10, 1, 500};
      System.out.println("Before sort: ");
      for(int num : arrNumbers)
      {
         System.out.println(num);
      }
      for(int a = 0; a < arrNumbers.length; a++)
      {
         for(int b = a + 1; b < arrNumbers.length; b++)
         {
            if(arrNumbers[a] > arrNumbers[b])
            {
               temp = arrNumbers[a];
               arrNumbers[a] = arrNumbers[b];
               arrNumbers[b] = temp;
            }
         }
      }
      System.out.println("---------------");
      System.out.println("After sort: ");
      for(int num : arrNumbers)
      {
         System.out.println(num);
      }
   }
}

// java sort array of objects
import java.util.Arrays;
public class Employee implements Comparable<Employee>
{
   private String empName; 
   private int empAge;
   public Employee(String name, int age) 
   { 
      this.empName = name; 
      this.empAge = age; 
   }
   @Override 
   public String toString() 
   { 
      return "{" + "name='" + empName + '\'' + ", age=" + empAge + '}'; 
   }
   public String getName() 
   { 
      return empName; 
   }
   public int getAge() 
   { 
      return empAge; 
   }
   @Override 
   public int compareTo(Employee o) 
   { 
      if(this.empAge != o.getAge()) 
      { 
         return this.empAge - o.getAge(); 
      }
      return this.empName.compareTo(o.getName()); 
   }
}
public class SortArrayObjects 
{
   public static void main(String[] args) 
   {
      Employee[] obj = { new Employee("virat", 25), new Employee("dhoni", 20), 
                         new Employee("rohit", 22), new Employee("rahul", 24)};
      Arrays.sort(obj); 
      System.out.println(Arrays.toString(obj));
   }
}

Here’s the java program to sort an array using Arrays.sort() method.

import java.util.Arrays;
public class JavaArraySortMethod
{
   public static void main(String[] args)
   {
      String[] strGiven = {"Great Barrier Reef", "Paris", "borabora", "Florence","tokyo", "Cusco"};
      Arrays.sort(strGiven);
      System.out.println("Output(case sensitive) : " + Arrays.toString(strGiven));
   }
}