The Scanner class is used to get user input, and it is found in the java.util package. To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation.

Use Scanner.next(Pattern) and pass Pattern.compile("[A-Za-z0-9]") to let scanner accept only 1 character defined. You can pass any regex as argument and check for next() Scanner.next(); for next line with spaces

A simple text scanner which can parse primitive types and strings using regular expressions. A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace.

Mar 22, 2012 · I'm writing a program that uses an Event class, which has in it an instance of a calendar, and a description of type String. The method to create an event uses a Scanner to take in a month, day, year, hour, minute, and a description. The problem I'm having is that the Scanner.next() method only returns the first word before a space.

Apr 11, 2025 · In Java, the Scanner class is present in the java.util package is used to obtain input for primitive types like int, double, etc., and strings. We can use this class to read input from a user or a file. In this article, we cover how to take …

Jan 11, 2014 · Firstly, because you want to do validation, just read the input in as a String. Then you want to check that it's a number. You can use the parse method, wrapped up in a try catch. int inputDbl = Integer.parseInt(input); System.out.println("This is not a number");

The Scanner class of the java.util package is used to read input data from different sources like input streams, users, files, etc. In this tutorial, we will learn about the Java Scanner and its methods with the help of examples.

To see how scanning works, let's look at ScanXan, a program that reads the individual words in xanadu.txt and prints them out, one per line. public static void main(String[] args) throws IOException { Scanner s = null; try { s = new Scanner(new BufferedReader(new FileReader("xanadu.txt"))); while (s.hasNext()) { System.out.println(s.next());

Mar 8, 2021 · The Scanner input in Java should be of primitive data types, such as int, float, double, etc., and string types. As an example, to get the value of a variable declared as int type, the function used is nextint().

Oct 6, 2021 · There are different functions in Java’s Scanner Class used to take input directly from the user or read from a file. For instance, nextint() is used to take integer type input, and nextfloat() is for float type input. Similarly, nextLine() and …