Simplest Way to Sort an array in Java and Customized Sorting Of arrays in java

 Simplest Way to Sort an array in Java and Customized Sorting Of arrays in java

Do Check My Video On Utility Classes:

Arrays:

Arrays class is the utility class to define the several utility methods for the array objr=ect

Array class defines the following methods to sort the array

1)public static void sort(Primitive[] P):

to sort acc. to natural sorting order

2)public static void sort(Object[] P):

3)public static void sort(Object[] o,Comparator c):

sort acc to customized sorting order

Example:

import java.util.Arrays;

import java.util.Comparator;

public class Test{

    public static void main(String[] args) {

        int[] a = {10,5,20,11,6};

        System.out.println("Primitive array before sorting: ");

        for(int a1:a){

            System.out.print(""+a1+" ");//10 5 20 11 6

        }

        Arrays.sort(a);

        System.out.println();

        System.out.println("Primitive array after Sorting : ");

        for(int a1:a) {

            System.out.print("" + a1 + " ");//5 6 10 11 20

        }

        System.out.println();

        String[] s = {"s","e","g"};

        System.out.print("Objects Before sorting: ");

        for (String s1:s){

            System.out.print(s1+" ");//s e g

        }

        Arrays.sort(s);

        System.out.println();

        System.out.print("objects after sorting: ");

        for (String s1:s){

            System.out.print(s1+" ");//e g s

        }

        Arrays.sort(s,new MyComparator());

        System.out.println();

        System.out.println("Object array after sorting by comparator: ");

        for(String a1:s){

            System.out.print(a1+" ");//s g e 

        }

    }

}

class MyComparator implements Comparator{

    public int compare(Object obj1,Object obj2){

        String s1 = obj1.toString();

        String s2 = obj2.toString();

        return s2.compareTo(s1);

    }

}

o/p:

Primitive array before sorting:

10 5 20 11 6

Primitive array after Sorting :

5 6 10 11 20

Objects Before sorting: s e g

objects after sorting: e g s

Object array after sorting by comparator:

s g e

Note:we can sort primitive array based on only default natural sorting whereas we cansort object arrays either based on default natural sorting or based on customized sorting.