There are 2 methods to take input from the user which are separated by space which are as follows:
- Using BufferedReader Class and then splitting and parsing each value
- Using nextInt( ) method of Scanner class
Let us discuss both the methods one by one in order to get a better understanding by implementing the same clean java programs.
Method 1:
Using BufferedReader Class and then splitting and parsing each value.
Procedure:
- Using readline() method of BufferedReader and Scan the whole string.
- Split this String for str.split(” “)
- Iterate over the above array and parse each integer value using Integer.parseInt( ).
Example
Java
// Java Program to Take Input from User Separated by Space// Using BufferedReader class// Importing required classesimport java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;// Main class// BufferedReaderTestclass GFG { // Main driver method public static void main(String[] args) throws IOException { // Creating an object of BufferedReader class BufferedReader bi = new BufferedReader( new InputStreamReader(System.in)); // Custom integer array of size 10 int num[] = new int[10]; // Array of string type to store input String[] strNums; // Display message System.out.println("enter string of numbers"); // Reading input a string strNums = bi.readLine().split(" "); for (int i = 0; i < strNums.length; i++) { num[i] = Integer.parseInt(strNums[i]); } // Display message System.out.println("printing stored numbers "); // Printing the stored numbers using for loop for (int i = 0; i < strNums.length; i++) { System.out.println(num[i]); } }} |
Output:
FIG = OUTPUT OF METHOD 1
Method 2: Using nextInt() method of Scanner class.
Procedure:
- Using the nextInt() method of Scanner class and scan to scan the input.
- Using for loop to store input in an array.
- Iterate through the above array and parse each integer using sc.nextInt()
Example
Java
// Java Program to Take Input from User Separated by Space// Using Scanner class// Importing required classesimport java.io.IOException;import java.util.Scanner;// Main class// Scanner classclass GFG { // Main driver method public static void main(String[] args) throws IOException { // Display message for better readability System.out.println("enter input "); // Creating an object of Scanner class Scanner sc = new Scanner(System.in); // Declaring and initializing an array of size 10 int[] nums = new int[10]; int i; // Loop to store input values in nums array for (i = 0; i < nums.length; i++) { nums[i] = sc.nextInt(); } // Display message System.out.println("printing stored values"); // Printing stored values for (i = 0; i < nums.length; i++) { System.out.println(nums[i] + " "); } }} |
Output:
FIG = OUTPUT OF METHOD 2
Note: The first method using Bufferedreader class and then splitting and parsing each value is much faster than using nixing() method of Scanner class. It is nearly 2 times faster than the second one. Below we do provide in order how to calculate the time consume by both methods by using nanotime method
// Initializing variables
long startTime, endTime;
// Start time
startTime = System.nanoTime(); {
// Insert code here
// Method 1 or method 2 code
}
// End time
endTime = System.nanoTime();
