How to Handle Java Files with Streams
See Java: Tips and Tricks for similar articles.Streams permit the Java developer to handle files. In other words, a file can be read or created by the use of streams. To read a file, a file input stream reader can be combined with a buffered reader. A record from the file can then be presented to an application. To create a file, a file output writer can be combined with a print writer object to write a stream of data to a file. To learn how to handle Java files with streams, follow these four steps.
- Open your text editor and type in the following Java statements:
The program will create a file and then read the file, displaying the records in the process. When you code the constructor argument of
FileWriter
andFileReader
, replace the string containing the path ("c:/JavaStuff"
) with a directory that exists on your computer. You can retain the file name (TestFile.txt
) or rename it if you prefer. ThePrintWriter
constructor is placed in a "try with resources" statement. Therefore the file will be closed regardless of whether an exception occurs or not. TheIOException
is possible during execution of theFileWriter
constructor. The program writes two records to the file. TheBufferedReader
constructor is placed in a "try with resources" statement. Therefore the file will be closed regardless of whether an exception occurs or not. TheFileNotFoundException
is possible during execution of theFileReader
constructor. - Save your file as
HandleJavaFilesWithStreams.java
. - Open a command prompt and navigate to the directory containing your Java program. Then type in the command to compile the source and hit Enter.
- Type in the command to run your program and hit Enter. The output displays the two records that were written to the file.
Related Articles
- How to Check Object Type in Java
- How to Create a Jar File in Java
- How to Compile Packages in Java
- How to Throw an Exception in Java
- How to Create an Exception Class in Java
- How to Use the super Keyword to Call a Base Class Constructor in Java
- How to Use the Comparator.comparing Method in Java 8
- How to Use System.in in Java
- How to Call an Interface Method in Java
- How to Add a Time Zone in the Java 8 Date/Time API
- How to Rethrow an Exception in Java
- How to Use the instanceof Operator with a Generic Class in Java
- How to Instantiate an Object in Java
- How to Filter Distinct Elements from a Collection in Java 8
- How to Create a Derived Class in Java
- How to Skip Elements with the Skip Method in Java 8
- How to Create a Java Bean
- How to Implement an Interface in Java
- How to Compare Two Objects with the equals Method in Java
- How to Set PATH from JAVA_HOME
- How to Prevent Race Conditions in Java 8
- How to Write a Block of Code in Java
- How to Display the Contents of a Directory in Java
- How to Group and Partition Collectors in Java 8
- How to Create a Reference to an Object in Java
- How to Reduce the Size of the Stream with the Limit Method in Java 8
- How to Write an Arithmetic Expression in Java
- How to Format Date and Time in the Java 8 Date/Time API
- How to Use Comparable and Comparator in Java
- How to Break a Loop in Java
- How to Use the this Keyword to Call Another Constructor in Java
- How to Write a Unit Test in Java
- How to Declare Variables in Java
- How to Override Base Class Methods with Derived Class Methods in Java
- How to Use Serialized Objects in Java
- How to Write Comments in Java
- How to Implement Functional Interfaces in Java 8
- How to Write Type Parameters with Multiple Bounds in Java
- How to Add Type and Repeating Annotations to Code in Java 8
- How to Use Basic Generics Syntax in Java
- How to Map Elements Using the Map Method in Java 8
- How to Work with Properties in Java
- How to Write while and do while Loops in Java
- How to Use the finally Block in Java
- How to Write for-each Loops in Java
- How to Create a Method in Java
- How to Continue a Loop in Java
- How to Handle Java Files with Streams (this article)
- How to Create an Interface Definition in Java
- How Default Base Class Constructors Are Used with Inheritance