Arrays.sort() en Java con ejemplos

La clase de array es una clase que contiene métodos estáticos que se utilizan con arrays para buscar, ordenar, comparar, insertar elementos o devolver una representación de string de una array. en una array. Entonces, especifiquemos las funciones primero y más adelante discutiremos lo mismo. Son los siguientes que están presentes en la clase java.util.Arrays . Aquí discutiremos diferentes gráficos usando el método sort() de la clase Arrays .

El método Arrays.sort() consta de dos variaciones, una en la que no pasamos ningún argumento donde ordena la array completa, ya sea una array entera o una array de caracteres, pero si se supone que debemos ordenar una parte específica usando este método de la clase Arrays, entonces lo sobrecargamos y pasamos el índice inicial y el último a la array.

import java.util.Arrays;
  
class GFG {
    public static void main(String args[])
    {
        int[] arr = { 5, -2, 23, 7, 87, -42, 509 };
        System.out.println("The original array is: ");
        for (int num : arr) {
            System.out.print(num + " ");
        }
        Arrays.sort(arr);
        System.out.println("\nThe sorted array is: ");
        for (int num : arr) {
            System.out.print(num + " ");
        }
    }
}

// Java Program to Sort Array of Integers
// by Default Sorts in an Ascending Order
// using Arrays.sort() Method
  
// Importing Arrays class from the utility class
import java.util.Arrays;
  
// Main class
public class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        // Custom input array
        int[] arr = { 13, 7, 6, 45, 21, 9, 101, 102 };
  
        // Applying sort() method over to above array
        // by passing the array as an argument
        Arrays.sort(arr);
  
        // Printing the array after sorting
        System.out.println("Modified arr[] : "
                           + Arrays.toString(arr));
    }
}

// Java program to Sort a Subarray in Array
// Using Arrays.sort() method
  
// Importing Arrays class from java.util package
import java.util.Arrays;
  
// Main class
public class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        // Custom input array
        // It contains 8 elements as follows
        int[] arr = { 13, 7, 6, 45, 21, 9, 2, 100 };
  
        // Sort subarray from index 1 to 4, i.e.,
        // only sort subarray {7, 6, 45, 21} and
        // keep other elements as it is.
        Arrays.sort(arr, 1, 5);
  
        // Printing the updated array which is
        // sorted after 2 index inclusive till 5th index
        System.out.println("Modified arr[] : "
                           + Arrays.toString(arr));
    }
}

// Java program to Sort a Subarray in Descending order
// Using Arrays.sort()
  
// Importing Collections class and arrays classes
// from java.util package
import java.util.Arrays;
import java.util.Collections;
  
// Main class
public class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        // Note that we have Integer here instead of
        // int[] as Collections.reverseOrder doesn't
        // work for primitive types.
        Integer[] arr = { 13, 7, 6, 45, 21, 9, 2, 100 };
  
        // Sorts arr[] in descending order using
        // reverseOrder() method of Collections class
        // in Array.sort() as an argument to it
        Arrays.sort(arr, Collections.reverseOrder());
  
        // Printing the array as generated above
        System.out.println("Modified arr[] : "
                           + Arrays.toString(arr));
    }
}

// Java program to sort an array of strings
// in ascending and descending alphabetical order
// Using Arrays.sort()
  
// Importing arrays and Collections class
// from java.util class
import java.util.Arrays;
import java.util.Collections;
  
// Main class
public class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        // Custom input string
        String arr[] = { "practice.geeksforgeeks.org",
                         "quiz.geeksforgeeks.org",
                         "code.geeksforgeeks.org" };
  
        // Sorts arr[] in ascending order
        Arrays.sort(arr);
        System.out.println("Modified arr[] : "
                           + Arrays.toString(arr));
  
        // Sorts arr[] in descending order
        Arrays.sort(arr, Collections.reverseOrder());
  
        // Lastly printing the above array
        System.out.println("Modified arr[] :"
                           + Arrays.toString(arr));
    }
}

// Java program to demonstrate Working of
// Comparator interface
  
// Importing required classes
import java.io.*;
import java.lang.*;
import java.util.*;
  
// Class 1
// A class to represent a student.
class Student {
    int rollno;
    String name, address;
  
    // Constructor
    public Student(int rollno, String name, String address)
    {
        // This keyword refers to current object itself
        this.rollno = rollno;
        this.name = name;
        this.address = address;
    }
  
    // Used to print student details in main()
    public String toString()
    {
        return this.rollno + " " + this.name + " "
            + this.address;
    }
}
  
// Class 2
// Helper class extending Comparator interface
class Sortbyroll implements Comparator<Student> {
    // Used for sorting in ascending order of
    // roll number
    public int compare(Student a, Student b)
    {
        return a.rollno - b.rollno;
    }
}
  
// Class 3
// Main class
class GFG {
  
    // Main driver method
    public static void main(String[] args)
    {
        Student[] arr
            = { new Student(111, "bbbb", "london"),
                new Student(131, "aaaa", "nyc"),
                new Student(121, "cccc", "jaipur") };
  
        System.out.println("Unsorted");
  
        for (int i = 0; i < arr.length; i++)
            System.out.println(arr[i]);
  
        // Sorting on basic as per class 1 created
        // (user-defined)
        Arrays.sort(arr, new Sortbyroll());
  
        System.out.println("\nSorted by rollno");
  
        for (int i = 0; i < arr.length; i++)
            System.out.println(arr[i]);
    }
}

// This will sort the array in the descending order
/*package whatever //do not write package name here */
import java.util.Arrays;
import java.util.Collections;
public class GFG {
    public static void main(String[] args)
    {
        Integer[] array
            = { 99, 12, -8, 12, 34, 110, 0, 121, 66, -110 };
  
        Arrays.sort(array, Collections.reverseOrder());
        System.out.println(
            "Array in descending order: "
            + Arrays.toString(array));
    }
}