{"id":1292,"date":"2022-02-27T06:01:45","date_gmt":"2022-02-27T06:01:45","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=1292"},"modified":"2022-02-27T06:01:45","modified_gmt":"2022-02-27T06:01:45","slug":"byte-array-input-stream-class","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/02\/27\/byte-array-input-stream-class\/","title":{"rendered":"Byte Array Input Stream Class"},"content":{"rendered":"\n

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

The ByteArrayInputStream<\/code> class of the java.io<\/code> package can be used to read an array of input data (in bytes).<\/p>\n\n\n\n

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

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

Note<\/strong>: In ByteArrayInputStream<\/code>, the input stream is created using the array of bytes. It includes an internal array to store data of that particular byte array.<\/p>\n\n\n\n

\n\n\n\n

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

In order to create a byte array input stream, we must import the java.io.ByteArrayInputStream<\/code> package first. Once we import the package, here is how we can create an input stream.<\/p>\n\n\n\n

\/\/ Creates a ByteArrayInputStream that \nreads entire array\nByteArrayInputStream input = new ByteArrayInputStream(byte[] arr);\n<\/code><\/pre>\n\n\n\n
Here, we have created an input stream that reads entire data from the arr<\/code> array. However, we can also create the input stream that reads only some data from the array.<\/p>\n\n\n\n
\/\/ Creates a ByteArrayInputStream that reads a \nportion of array\nByteArrayInputStream input = new ByteArrayInputStream(byte[] arr, int start, int length);\n<\/code><\/pre>\n\n\n\n
Here the input stream reads the number of bytes equal to length<\/var> from the array starting from the start<\/var> position.<\/p>\n\n\n\n
\n\n\n\n
Methods of ByteArrayInputStream<\/h2>\n\n\n\n
The ByteArrayInputStream<\/code> class provides implementations for different methods present in the InputStream<\/code> class.<\/p>\n\n\n\n
read() Method<\/h3>\n\n\n\n
  • read()<\/code> – reads the single byte from the array present in the input stream<\/li>
  • read(byte[] array)<\/code> – reads bytes from the input stream and stores in the specified array<\/li>
  • read(byte[] array, int start, int length)<\/code> – reads the number of bytes equal to length<\/var> from the stream and stores in the specified array starting from the position start<\/var><\/li><\/ul>\n\n\n\n
    Example: ByteArrayInputStream to read data<\/h3>\n\n\n\n
    import java.io.ByteArrayInputStream;\n\npublic class Main {\n  public static void main(String[] args) {\n\n    \/\/ Creates an array of byte\n    byte[] array = {1, 2, 3, 4};\n\n    try {\n      ByteArrayInputStream input = new ByteArrayInputStream(array);\n\n      System.out.print(\"The bytes read from the input stream: \");\n\n      for(int i= 0; i < array.length; i++) {\n\n        \/\/ Reads the bytes\n        int data = input.read();\n        System.out.print(data + \", \");\n      }\n      input.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 bytes read from the input stream: 1, 2, 3, 4,\n<\/samp><\/code><\/pre>\n\n\n\n
    In the above example, we have created a byte array input stream named input<\/code>.<\/p>\n\n\n\n
    ByteArrayInputStream input = new ByteArrayInputStream(array);\n<\/code><\/pre>\n\n\n\n
    Here, the input stream includes all the data from the specified array. To read data from the input stream, we have used the read()<\/code> method.<\/p>\n\n\n\n
    \n\n\n\n
    available() Method<\/h3>\n\n\n\n
    To get the number of available bytes in the input stream, we can use the available()<\/code> method. For example,<\/p>\n\n\n\n
    import java.io.ByteArrayInputStream;\n\npublic class Main {\n\n  public static void main(String args[]) {\n\n    \/\/ Creates an array of bytes\n    byte[] array = { 1, 2, 3, 4 };\n\n    try {\n      ByteArrayInputStream input = new ByteArrayInputStream(array);\n\n      \/\/ Returns the available number of bytes\n      System.out.println(\"Available bytes at the beginning: \" + input.available());\n\n      \/\/ Reads 2 bytes from the input stream\n      input.read();\n      input.read();\n\n      \/\/ Returns the available number of bytes\n      System.out.println(\"Available bytes at the end: \" + input.available());\n\n      input.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
    Available bytes at the beginning: 4\nAvailable bytes at the end: 2\n<\/samp><\/code><\/pre>\n\n\n\n
    In the above example,<\/p>\n\n\n\n
    1. We have used the available()<\/code> method to check the number of available bytes in the input stream.<\/li>
    2. We have then used the read()<\/code> method 2 times to read 2 bytes from the input stream.<\/li>
    3. Now, after reading the 2 bytes, we have checked the available bytes. This time the available bytes decreased by 2.<\/li><\/ol>\n\n\n\n
      \n\n\n\n
      skip() Method<\/h3>\n\n\n\n
      To discard and skip the specified number of bytes, we can use the skip()<\/code> method. For example,<\/p>\n\n\n\n
      import java.io.ByteArrayInputStream;\n\npublic class Main {\n\n  public static void main(String args[]) {\n\n    \/\/ Create an array of bytes\n    byte[] array = { 1, 2, 3, 4 };\n    try {\n      ByteArrayInputStream input = new ByteArrayInputStream(array);\n\n      \/\/ Using the skip() method\n      input.skip(2);\n      System.out.print(\"Input stream after skipping 2 bytes: \");\n\n      int data = input.read();\n      while (data != -1) {\n        System.out.print(data + \", \");\n        data = input.read();\n      }\n\n      \/\/ close() method\n      input.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
      Input stream after skipping 2 bytes: 3, 4,\n<\/samp><\/code><\/pre>\n\n\n\n
      In the above example, we have used the skip()<\/var> method to skip 2 bytes of data from the input stream. Hence 1<\/var> and 2<\/var> are not read from the input stream.<\/p>\n\n\n\n
      \n\n\n\n
      close() Method<\/h3>\n\n\n\n
      To close the input stream, we can use the close()<\/code> method.<\/p>\n\n\n\n
      However, the close()<\/code> method has no effect in ByteArrayInputStream<\/code> class. We can use the methods of this class even after the close()<\/code> method is called.<\/p>\n\n\n\n
      \n\n\n\n
      Other Methods Of ByteArrayInputStream<\/h2>\n\n\n\n
      Methods<\/th>Descriptions<\/th><\/tr>
      finalize()<\/code><\/td>ensures that the close()<\/code> method is called<\/td><\/tr>
      mark()<\/code><\/td>marks the position in input stream up to which data has been read<\/td><\/tr>
      reset()<\/code><\/td>returns the control to the point in the input stream where the mark was set<\/td><\/tr>
      markSupported()<\/code><\/td>checks if the input stream supports mark()<\/code> and reset()<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"
      In this tutorial, we will learn about Java ByteArrayInputStream and its methods with the help of examples. The ByteArrayInputStream class of the java.io package can be used to read an array of input data (in bytes). It extends the InputStream abstract class. Note: In ByteArrayInputStream, the input stream is created using the array of bytes. It includes an internal array to store […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[483],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1292"}],"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=1292"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1292\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}