Hello guys, welcome to Lingarajtechhub.com. Today we are going to discuss Input n numbers into an array and add all the elements using java.
package com.array.java; import java.util.Scanner; public class Add_element { public static void main(String[] args) { int size,i,sum=0; Scanner Sc=new Scanner(System.in); System.out.println("enter array size\n"); size=Sc.nextInt( ); int arr[]=new int[100]; System.out.println("enter array elements\n"); for(i=0;i<size;i++) { arr[i]=Sc.nextInt(); sum=sum+arr[i]; } System.out.println("sum of the array:"+sum); } }
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 .
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❖ 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 .
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❖ public class Add_element{
*Here class Add_element 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 .
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❖ 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.
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❖ int size,i,sum=0;
>>it means we declare the size,no and the sum is equal to 0.
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❖ 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
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❖ System.out.println(“Enter array size:\n “);
>>– it means System is a class name and out is an instance of the System println is print a new line .
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- size]=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.
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❖ int arr[ =new int[100] ;
>>– here we declare array size and initialise the array element which is integer type.
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❖ System.out.println(“enter array Elements:\n”);
>>– it means System is a class name and out is an instance of the System println is print a new line .
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❖ for(int i=0;i<size;i++) {
>>it means loop through the array by incrementing the value of i.
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❖ 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.
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❖sum=sum+arr[i];
>>–it means to sum all the elements which is taken by the keyboard.
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❖ System.out.println(“sum of the array:”+sum);
>>– it means System is a class name and out is an instance of the System println is print a new line .
>>– +sum means concatenate or comma operator and sum the element.