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Java Program to Read The Number From Standard Input
In this article, we will understand how to read a number from standard input in Java. The Scanner.nextInt() method is used to read the number. The java.util.Scanner.nextInt() method Scans the next token of the input as an int. An invocation of this method of the form nextInt() behaves in exactly the same way as the invocation nextInt(radix), where radix is the default radix of this scanner.
Below is a demonstration of the same −
Input
Suppose our input is −
55
Output
The desired output would be −
The input value is 55
Algorithm
Step1- Start Step 2- Declare an integer: value Step 3- Prompt the user to enter an integer value/ define the integer Step 4- Read the values Step 5- Display the value Step 6- Stop
Example 1
Here, the input is being entered by the user based on a prompt. You can try this example live in ourcoding ground tool 
.
import java.util.Scanner;
public class PrintNumber{
public static void main(String[] args){
int value;
System.out.println("Required packages have been imported");
System.out.println("Variable to store value is defined");
Scanner reader = new Scanner(System.in);
System.out.println("A reader object has been defined\n");
System.out.print("Enter a number: ");
value = reader.nextInt();
System.out.println("The nextInt method is used to read the number ");
System.out.println("The number is: ");
System.out.println(value);
}
}Output
Required packages have been imported Variable to store value is defined A reader object has been defined Enter a number: 55 The nextInt method is used to read the number The number is: 55
Example 2
Here, the input is being entered by the user based on a prompt and read through InputStreamReader object.
Here, the input is being entered by the user based on a prompt. You can try this example live in ourcoding ground tool .
import java.io.*;
public class readNum{
public static void main(String args[]) throws IOException{
InputStreamReader read=new InputStreamReader(System.in);
System.out.println("An object of InputStreamReader class is created");
BufferedReader in=new BufferedReader(read);
System.out.println("A constructor of the BufferedReader class is created");
System.out.println("Enter a number: ");
int number=Integer.parseInt(in.readLine());
System.out.println("The number is : "+number);
}
}Output
An object of InputStreamReader class is created A constructor of the BufferedReader class is created Enter a number: The number is : 45
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