Hello guys, welcome to Lingarajtechhub.com . Today we are going to discus about Input n numbers of elements into an array and sort them in descending order.
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();
>>– 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-18:
❖int temp=0;
>>temporary variable to store the element.
Line-19:
❖ for(int i=0;i<n;i++) {
>>it means loop through the array by incrementing the value of i,and hold each array element.
Line-21:
❖for(int j=i+1;j<arr.length;j++)
>>it compares the remaining array elements.
Line-23:
❖if(arr[i]<arr[j]
>>compare and swap.
Line-31:
❖ System.out.println( );
>>– it means System is a class name and out is an instance of the System println is print a new line .
>>– displaying elements of array after sorting.
Line-32:
❖for(int i=0;i<arr.length;i++)
>> >>it means loop through the array by incrementing the value of i,and hold each array element.
Line-34:
❖ System.out.println(arr[i];i+” “ );
>>– it means System is a class name and out is an instance of the System println is print a new line .
>>+ is a comma operator.
