Input n numbers of elements into an array and sort them in descending order

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 package com.array.java;
         import java.util.Scanner;

         public class Descending_order {

	     public static void main(String[] args) {
	
		int n;//array size declaration
		Scanner Sc=new Scanner(System.in);
		System.out.println("enter the number of elements:");
		n=Sc.nextInt( );
		int arr[] =new int[n];//array declaration
		System.out.println("enter the elements of the array:");
		for(int i=0;i<n;i++)
		{
			arr[i]=Sc.nextInt( );
		}
		int temp=0;//temporary variable to store the element
		for(int i=0;i<arr.length;i++)//holds each array element
		{
		for(int j=i+1;j<arr.length;j++)//compares with remaining array elements
			{
				if(arr[i]<arr[j])//compare and swap
				{
					temp=arr[i];
					arr[i]=arr[j];
					arr[j]=temp;
				}
			}
		}
		System.out.println( );//displaying elements of array after sorting
		for(int i=0;i<arr.length;i++)
		{
			System.out.println(arr[i]+" ");
		}
		
		
		}
		}

Line-1:

❖ Package com.array.java;

It is a java package( com.array.java) which is a collection of classes and this package is created in a java project .

Line-2:

❖ import java.util.Scanner;

Scanner is a class in java. util package used for obtaining the input of the primitive types like int, double, etc. and strings .

Line-4:

❖ public class Descending_order{

*Here class Descending_order is defined as a class which is a template used to create objects and to define object data types and methods .

>–and it’s defined as public because it can be accessed anywhere .

Line-6:

❖ public static void main(String[] args)

>>– it is a main method in which we can execute a program //public :it is an access modifier of the main function which must be public so that the JVM which is (Java Virtual Machine)can access and execute this method.

//If a method is not public, then access is restricted and its showing error //static is a keyword in which main method has must to be static in which JVM can load the class into memory and call the main method without creating an instance

//void it means no return type

//main() is function string[]args : string means collection of characters ,String[] args represents a collection of Strings that are separated by a space and can be typed into the program on the terminal directly.

Line-8:

❖ int n;

>>it means we declare the size of array.

Line-9:

❖ Scanner sc=new Scanner(System.in);

>>–it means here scanner is a class and Sc is the instance of the object which is new Scanner.System.in is an argument

Line-10:

❖ System.out.println(“Enter the number of elements: “);

>>– it means System is a class name and out is an instance of the System println is print a new line .

Line-11:

n=sc.nextInt();

>>– here i is a variable that we take and Sc is our instance name which is created for an object and nextInt() is a method method of a Scanner object that reads in a string of digits or char and converts them into an int type.

Line-12:

❖ int arr[ ]=new int[n] ;

>>– here we declare array size and initialise the array element which is integer type.

Line-13:

❖ System.out.println(“enter the elements of the array”);

>>– it means System is a class name and out is an instance of the System println is print a new line .

Line-14:

❖ for(int i=0;i<n;i++) {

>>it means loop through the array by incrementing the value of i.

Line-16:

❖ arr[i]=Sc.nextInt();

Line-18: