What does scanner do in java

In this tutorial, we will learn about the Java Scanner and its methods with the help of examples. The Scanner class of the java.

Let's take an example. The System. It works just like taking inputs from the keyboard. We have then used the nextLine method of the Scanner class to read a line of text from the user. As we can see from the above example, we need to import the java. Scanner package before we can use the Scanner class. To learn more about importing packages, visit Java Packages. Here, we have created objects of the Scanner class that will read input from InputStream , File , and String respectively.

The Scanner class provides various methods that allow us to read inputs of different types. In the above example, we have used the nextDouble method to read a floating-point value. In the above example, we have used the next method to read a string from the user.

Here, we have provided the full name. However, the next method only reads the first name. This is because the next method reads input up to the whitespace character.

Once the whitespace is encountered, it returns the string excluding the whitespace. In the first example, we have used the nextLine method to read a string from the user. Unlike next , the nextLine method reads the entire line of input including spaces.

Recommended Reading: Java Scanner skipping the nextLine. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. Data Warehouse.

Javatpoint Services JavaTpoint offers too many high quality services. It is used to find the next occurrence of a pattern constructed from the specified string, ignoring delimiters. It is used to check if the next token in this scanner's input can be interpreted as a BigDecimal using the nextBigDecimal method or not.

It is used to check if the next token in this scanner's input can be interpreted as a Boolean using the nextBoolean method or not. It is used to check if the next token in this scanner's input can be interpreted as a Byte using the nextBigDecimal method or not. It is used to check if the next token in this scanner's input can be interpreted as a BigDecimal using the nextByte method or not.

To use the Scanner class, create an object of the class and use any of the available methods found in the Scanner class documentation.

In our example, we will use the nextLine method, which is used to read Strings:. Run Example ». If you don't know what a package is, read our Java Packages Tutorial. In the example above, we used the nextLine method, which is used to read Strings. To read other types, look at the table below:.

Note: If you enter wrong input e.