We will learn about all these subclasses in the next tutorial.<\/p>\n\n\n\n
\n\n\n\n
Create an InputStream<\/h2>\n\n\n\n
In order to create an InputStream, we must import the java.io.InputStream<\/code> package first. Once we import the package, here is how we can create the input stream.<\/p>\n\n\n\n
\/\/ Creates an InputStream\nInputStream object1 = new FileInputStream();\n<\/code><\/pre>\n\n\n\n
Here, we have created an input stream using FileInputStream<\/code>. It is because InputStream<\/code> is an abstract class. Hence we cannot create an object of InputStream<\/code>.<\/p>\n\n\n\n
Note<\/strong>: We can also create an input stream from other subclasses of InputStream<\/code>.<\/p>\n\n\n\n\n\n\n\n
Methods of InputStream<\/h2>\n\n\n\n
The InputStream<\/code> class provides different methods that are implemented by its subclasses. Here are some of the commonly used methods:<\/p>\n\n\n\n
read()<\/code> – reads one byte of data from the input stream<\/li>
read(byte[] array)<\/code> – reads bytes from the stream and stores in the specified array<\/li>
available()<\/code> – returns the number of bytes available in the input stream<\/li>
mark()<\/code> – marks the position in the input stream up to which data has been read<\/li>
reset()<\/code> – returns the control to the point in the stream where the mark was set<\/li>
markSupported()<\/code> – checks if the mark()<\/code> and reset()<\/code> method is supported in the stream<\/li>
skips()<\/code> – skips and discards the specified number of bytes from the input stream<\/li>
close()<\/code> – closes the input stream<\/li><\/ul>\n\n\n\n\n\n\n\n
Example: InputStream Using FileInputStream<\/h2>\n\n\n\n
Here is how we can implement InputStream<\/code> using the FileInputStream<\/code> class.<\/p>\n\n\n\n
Suppose we have a file named input.txt<\/strong> 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
Let’s try to read this file using FileInputStream<\/code> (a subclass of InputStream<\/code>).<\/p>\n\n\n\n
import java.io.FileInputStream;\nimport java.io.InputStream;\n\nclass Main {\n public static void main(String args[]) {\n\n byte[] array = new byte[100];\n\n try {\n InputStream input = new FileInputStream(\"input.txt\");\n\n System.out.println(\"Available bytes in the file: \" + input.available());\n\n \/\/ Read byte from the input stream\n input.read(array);\n System.out.println(\"Data read from the file: \");\n\n \/\/ Convert byte array into string\n String data = new String(array);\n System.out.println(data);\n\n \/\/ Close the input stream\n input.close();\n } catch (Exception e) {\n e.getStackTrace();\n }\n }\n}<\/code><\/pre>\n\n\n\n
Output<\/strong><\/p>\n\n\n\n
Available bytes in the file: 39\nData read from the file:\nThis is a line of text inside the file\n<\/code><\/pre>\n\n\n\n
In the above example, we have created an input stream using the FileInputStream<\/code> class. The input stream is linked with the file input.txt<\/strong>.<\/p>\n\n\n\n
InputStream input = new FileInputStream(\"input.txt\");\n<\/code><\/pre>\n\n\n\n
To read data from the input.txt<\/strong> file, we have implemented these two methods.<\/p>\n\n\n\n
input.read(array); \n \/\/ to read data from the input stream\ninput.close(); \n \/\/ to close the input stream\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
In this tutorial, we will learn about the Java InputStream class and its methods with the help of an example. The InputStream class of the java.io package is an abstract superclass that represents an input stream of bytes. Since InputStream is an abstract class, it is not useful by itself. However, its subclasses can be used to read data. Subclasses of […]<\/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\/1284"}],"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=1284"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1284\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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