How to Read and Write to Console in Java | Speed Code 4X

Read and Write to Console with Examples In this Java tutorial, learn different ways to read from and write to the system console. A console is generally connected with Java processes which are started using the command-line tool.

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It is important to note that if the Java process has started automatically, (for example a background task), the console may not be available for input and output purposes. In such cases, System.console() will return null.

Table Of Contents

1. Reading Input from Console 1.1. Reading Input with readLine() 1.2. Reading Input with readPassword() 1.3. Read Input with reader()
2. Writing Output to Console 2.1. Writing with System.out.println 2.2. Writing with printf()
3. Reading Input from Console By default, to read from system console, we can use the Console class. This class provides methods to access the character-based console, if any, associated with the current Java process. To get access to Console, call the method System.console().

Console gives three ways to read the input:

String readLine() – reads a single line of text from the console. char[] readPassword() – reads a password or encrypted text from the console with echoing disabled Reader reader() – retrieves the Reader object associated with this console. This reader is supposed to be used by sophisticated applications. For example, Scanner object which utilizes the rich parsing/scanning functionality on top of the underlying Reader.

2. Writing Output to Console The easiest way to write the output data to console is System.out.println() statements. Still, we can use printf() methods to write formatted text to console.

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