{"id":1304,"date":"2022-02-27T06:15:42","date_gmt":"2022-02-27T06:15:42","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=1304"},"modified":"2022-02-27T06:15:42","modified_gmt":"2022-02-27T06:15:42","slug":"file-writer-class","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/02\/27\/file-writer-class\/","title":{"rendered":"File Writer Class"},"content":{"rendered":"\n

In this tutorial, we will learn about Java FileWriter and its methods with the help of examples.<\/p>\n\n\n\n

The FileWriter<\/code> class of the java.io<\/code> package can be used to write data (in characters) to files.<\/p>\n\n\n\n

It extends the OutputStreamWriter<\/code> class.<\/p>\n\n\n\n

\"The<\/figure>\n\n\n\n

Before you learn more about\u00a0FileWriter<\/code>, make sure to know about\u00a0Java File.<\/p>\n\n\n\n

\n\n\n\n

Create a FileWriter<\/h2>\n\n\n\n

In order to create a file writer, we must import the Java.io.FileWriter<\/code> package first. Once we import the package, here is how we can create the file writer.<\/p>\n\n\n\n

1. Using the name of the file<\/strong><\/p>\n\n\n\n

FileWriter output = new FileWriter(String name);\n<\/code><\/pre>\n\n\n\n
Here, we have created a file writer that will be linked to the file specified by the name<\/var>.<\/p>\n\n\n\n
2. Using an object of the file<\/strong><\/p>\n\n\n\n
FileWriter  input = new FileWriter(File fileObj);\n<\/code><\/pre>\n\n\n\n
Here, we have created a file writer that will be linked to the file specified by the object of the file.<\/p>\n\n\n\n
In the above example, the data are stored using some default character encoding.<\/p>\n\n\n\n
However, since Java 11 we can specify the type of character encoding (UTF8<\/strong> or UTF16<\/strong>) as well.<\/p>\n\n\n\n
FileWriter input = new FileWriter(String file, Charset cs);\n<\/code><\/pre>\n\n\n\n
Here, we have used the Charset<\/code> class to specify the character encoding of the file writer.<\/p>\n\n\n\n
\n\n\n\n
Methods of FileWriter<\/h2>\n\n\n\n
The FileWriter<\/code> class provides implementations for different methods present in the Writer<\/code> class.<\/p>\n\n\n\n
write() Method<\/h3>\n\n\n\n
  • write()<\/code> – writes a single character to the writer<\/li>
  • write(char[] array)<\/code> – writes the characters from the specified array to the writer<\/li>
  • write(String data)<\/code> – writes the specified string to the writer<\/li><\/ul>\n\n\n\n
    \n\n\n\n
    Example: FileWriter to write data to a File<\/h3>\n\n\n\n
    import java.io.FileWriter;\n\npublic class Main {\n\n  public static void main(String args[]) {\n\n    String data = \"This is the data in the output file\";\n\n    try {\n      \/\/ Creates a FileWriter\n      FileWriter output = new FileWriter(\"output.txt\");\n\n      \/\/ Writes the string to the file\n      output.write(data);\n\n      \/\/ Closes the writer\n      output.close();\n    }\n\n    catch (Exception e) {\n      e.getStackTrace();\n    }\n  }\n}\n<\/code><\/pre>\n\n\n\n
    In the above example, we have created a file writer named output<\/var>. The output reader is linked with the output.txt<\/strong> file.<\/p>\n\n\n\n
    FileWriter output = new FileWriter(\"output.txt\");\n<\/code><\/pre>\n\n\n\n
    To write data to the file, we have used the write()<\/code> method.<\/p>\n\n\n\n
    Here when we run the program, the output.txt<\/strong> file is filled with the following content.<\/p>\n\n\n\n
    This is a line of text inside the file.\n<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    getEncoding() Method<\/h2>\n\n\n\n
    The getEncoding()<\/code> method can be used to get the type of encoding that is used to write data. For example,<\/p>\n\n\n\n
    import java.io.FileWriter;\nimport java.nio.charset.Charset;\n\nclass Main {\n  public static void main(String[] args) {\n\n    String file = \"output.txt\";\n\n    try {\n      \/\/ Creates a FileReader with default encoding\n      FileWriter output1 = new FileWriter(file);\n\n      \/\/ Creates a FileReader specifying the encoding\n      FileWriter output2 = new FileWriter(file, Charset.forName(\"UTF8\"));\n\n      \/\/ Returns the character encoding of the reader\n      System.out.println(\"Character encoding of output1: \" + output1.getEncoding());\n      System.out.println(\"Character encoding of output2: \" + output2.getEncoding());\n\n      \/\/ Closes the reader\n      output1.close();\n      output2.close();\n    }\n\n    catch(Exception e) {\n      e.getStackTrace();\n    }\n  }\n}\n<\/code><\/pre>\n\n\n\n
    Output<\/strong><\/p>\n\n\n\n
    The character encoding of output1: Cp1252\nThe character encoding of output2: UTF8\n<\/samp><\/code><\/pre>\n\n\n\n
    In the above example, we have created 2 file writer named output1<\/var> and output2<\/var>.<\/p>\n\n\n\n
    • output1<\/var> does not specify the character encoding. Hence the getEncoding()<\/code> method returns the default character encoding.<\/li>
    • output2<\/var> specifies the character encoding, UTF8<\/strong>. Hence the getEncoding()<\/code> method returns the specified character encoding.<\/li><\/ul>\n\n\n\n
      Note<\/strong>: We have used the\u00a0Charset.forName()<\/code>\u00a0method to specify the type of character encoding.<\/p>\n\n\n\n
      \n\n\n\n
      close() Method<\/h2>\n\n\n\n
      To close the file writer, we can use the close()<\/code> method. Once the close()<\/code> method is called, we cannot use the writer to write the data.<\/p>\n\n\n\n
      \n\n\n\n
      Other methods of FileWriter<\/h2>\n\n\n\n
      Method<\/th>Description<\/th><\/tr>
      flush()<\/code><\/td>forces to write all the data present in the writer to the corresponding destination<\/td><\/tr>
      append()<\/code><\/td>inserts the specified character to the current writer<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"
      In this tutorial, we will learn about Java FileWriter and its methods with the help of examples. The FileWriter class of the java.io package can be used to write data (in characters) to files. It extends the OutputStreamWriter class. Before you learn more about\u00a0FileWriter, make sure to know about\u00a0Java File. Create a FileWriter In order to create a file writer, we […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[532],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1304"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1304"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1304\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}