How To Read Input From Ascendency Trouble Inwards Coffee Using Scanner
Java v introduced a prissy utility called java.util.Scanner which is capable of reading input shape ascendence employment inwards Java. Using Scanner is a prissy in addition to laid upward clean agency of retrieving user input from console or ascendence line. The scanner tin convey InputStream, Reader or exactly path of the file from where to read input. In gild to read from the ascendence line, nosotros tin overstep System.in into Scanner's constructor every bit a origin of input. The scanner offers several do goodness over classical BufferedReader approach, hither are about of the benefits of using java.util.Scanner for reading input from ascendence employment inwards Java:
1) The scanner supports regular expression, which gives yous the ability to read solely matching the designing from the input.
2) The scanner has methods similar nextInt(), nextFloat() which tin live on used to read numeric input from ascendence employment in addition to tin live on require used inwards code without using Integer.parseInt() or whatsoever other parsing logic to convert String to Integer or String to double for floating betoken input.
Reading input from the ascendence employment should live on the outset few matter which novel Java programmer should live on taught every bit it helps them to write an interactive programme in addition to consummate programming practice similar checking for a prime number, finding the factorial of a number, reversing String etc. Once yous are comfortable reading input from the ascendence employment yous tin write many interactive Java application without learning in GUI applied scientific discipline similar Swing or AWT.
Java programme to read input from ascendence prompts inwards Java
Here is sample code instance of How to read input from the ascendence employment or ascendence prompt in Java using java.util.Scanner class:
import java.io.IOException;
import java.util.Scanner;
public class ReadInputScannerExample {
public static void main(String args[]) throws IOException {
Scanner scanner = new Scanner(new InputStreamReader(System.in));
System.out.println("Reading input from console using Scanner inwards Java ");
System.out.println("Please piece of work into your input: ");
String input = scanner.nextLine();
System.out.println("User Input from console: " + input);
System.out.println("Reading int from console inwards Java: ");
int seat out = scanner.nextInt();
System.out.println("Integer input: " + number);
}
}
Output:
Reading input from console using Scanner inwards Java
Please piece of work into your input:
number
User Input from console: number
Reading int from console inwards Java:
1232
Integer input: 1232
import java.util.Scanner;
public class ReadInputScannerExample {
public static void main(String args[]) throws IOException {
Scanner scanner = new Scanner(new InputStreamReader(System.in));
System.out.println("Reading input from console using Scanner inwards Java ");
System.out.println("Please piece of work into your input: ");
String input = scanner.nextLine();
System.out.println("User Input from console: " + input);
System.out.println("Reading int from console inwards Java: ");
int seat out = scanner.nextInt();
System.out.println("Integer input: " + number);
}
}
Output:
Reading input from console using Scanner inwards Java
Please piece of work into your input:
number
User Input from console: number
Reading int from console inwards Java:
1232
Integer input: 1232
Just banknote that java.util.Scanner nextInt() volition throw "Exception inwards thread "main" java.util.InputMismatchException" exception if yous entered String or grapheme information which is non seat out spell reading input using nextInt(). That’s all on how to read user input from the ascendence employment or ascendence prompt inwards Java. Further Learning
Complete Java Masterclass
How to run Java programme from ascendence line
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