#JAVA READ INPUT DOWNLOAD#

You can also use Scanner along with FileReader to read input from a file. As evident from the output, the next() method in the Scanner class returns the next token, whereas you can use the nextLine() method to read the current line, excluding any line separator at the end. Here, we read the input string from the console and then parse them.

#JAVA READ INPUT DOWNLOAD#

In order to read a JSON file, we need to download the json-simple.jar file and set the path to execute it. As evident from the output, the next() method in the Scanner class returns the next token. Scanner scanner = new Scanner(System.in) The json.simple is a lightweight JSON processing library that can be used to read and write JSON files and it can be used to encode or decode JSON text and fully compliant with JSON specification ( RFC4627 ). Here, we read the input string from the console and then parse them. Also, as per the output, we can see that the input string splits based on commas. Then we read each of the tokens using the next() method. If you want to do that, then pass input. You cant then switch back to the command line from inside the application. Also, using the useDelimiter() function, we specify a comma as a delimiter. By executing 'java Read < input.txt' youve told the operating system that for this process, the piped file is standard in. Here, we have hardcoded the input in a String and passed it to a Scanner object. String input = 'Comma,separated,input,string' Use Hard-coded Input Strings Split by Custom Delimiters The above program also shows that the default delimiter for Scanner is whitespace. Finally, we read each of the tokens and check if it's a string or a number. String input = 'Ronaldo has an extensive collection of 16 royal cars' There are various ways to read input using the Scanner class. Also, it enables us to provide our own delimiter to parse the input string. So parsing the input in a given way becomes easy. Scanner class breaks this input into tokens and provides methods like next(), nextLine(), nextInt(), nextDouble(), etc to convert the tokens to String, Integer, Double etc respectively. So in our example, the token “Ronaldo” will be String, whereas the token “16” will be an Integer. Now, we can convert these tokens into Integers or String based on the user requirements. Here if we use space as a delimiter, below are the tokens that we get:

Input: Ronaldo has an extensive collection of 16 royal cars. These tokens can later be converted into values of different types using the various next methods. It breaks the input into tokens using a delimiter pattern, which by default is whitespace. Scanner is a class present in the java.util package.

Interview Questions Related to Java Scanner.

Java Clear Scanner Using the nextLine() Method.

This article discusses the Scanner use cases in detail.

Knowing about the functionalities that these methods provide can always come in handy. In many programming interview problems, we need to be comfortable with different ways to handle the input. Scanner reset in Java, as the name suggests, resets the scanner object.

Java read input