Superclass of all classes representing an input stream of bytes is

Java InputStream last modified January 10, 2023 Java InputStream tutorial shows how to work with InputStream class in Java. Java stream is a flow of data from a source or into a destination. A good metaphor for Java streams is water flowing from a tap into a bathtub and later into a drainage. InputStream and OutputStream are abstractions over low-level access to data, such as C file pointers. Java InputStream InputStream is a source for reading data. A stream can represent various kinds of sources, including disk files, devices, other programs, and memory arrays. Streams support many different types of data, including simple bytes, primitive data types, localized characters, and objects. Java InputStream subclasses InputStream is an abstract class; it is a superclass for all classes representing an input stream of bytes, including AudioInputStream, ByteArrayInputStream, FileInputStream, FilterInputStream, ObjectInputStream, PipedInputStream, and SequenceInputStream. Java InputStream close The FileInputStream's close method closes the input stream and releases any system resources associated with this stream. In our examples we use try-with-resources statement, which ensures that each resource is closed at the end of the statement. Java InputStream read InputStream reads bytes with the following read methods : • read(byte[] b) — reads up to b.length bytes of data from this input stream into an array of bytes. • read(byte[] b, int off, int len) — reads up to len bytes of dat...

In this tutorial, we'll explore details about the Java class OutputStream. O utputStream is an abstract class. This serves as the superclass for all classes representing an output stream of bytes. We'll examine what do these words like “output” and “stream” mean in more details as we go along. 2. Brief Introduction to Java IO OutputStream is part of the Java IO API which defines classes required to perform I/O operations in Java. These are all packaged in the java.io namespace. This is one of the core packages available in Java since version 1.0. Starting Java 1.4, we also have Java NIO packaged in the namespace java.nio which enables non-blocking input and output operations. Our focus area for this article, however, is ObjectStream as part of Java IO. Java IO provides the concept of streams which basically represents a continuous flow of data. Streams can support many different types of data like bytes, characters, objects, etc. Moreover, connection to a source or a destination is what a stream represents. They hence come as either InputStream or OutputStream respectively. We can use this method to write one specific byte to the OutputStream. Since the argument “int” comprises four bytes, as par the contract only the first low order byte is written and the remaining three high order bytes and ignored: public static void fileOutputStreamByteSingle(String file, String data) throws IOException If we call this method with data as “Hello World!”, what we get as result is a fi...

This abstract class is the superclass of all classes representing an input stream of bytes. Applications that need to define a subclass of InputStream must always provide a method that returns the next byte of input. Since: JDK1.0 See Also: BufferedInputStream, ByteArrayInputStream, DataInputStream, FilterInputStream, read(), OutputStream, PushbackInputStream Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. A subclass must provide an implementation of this method. Returns: the next byte of data, or -1 if the end of the stream is reached. Throws: • read publicintread(byte[]b) throws Reads some number of bytes from the input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown. If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at the end of the file, the value -1 is returned; otherwise, at least one byte is read and stored into b. The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes...

Class java.io.InputStream Class java.io.InputStream public abstract class InputStream extends Applications that need to define a subclass of InputStream must always provide a method that returns the next byte of input. See Also: InputStream() available() Returns the number of bytes that can be read from this input stream without blocking. close() Closes this input stream and releases any system resources associated with the stream. mark(int) Marks the current position in this input stream. markSupported() Tests if this input stream supports the mark and reset methods. read() Reads the next byte of data from this input stream. read(byte[]) Reads up to b.length bytes of data from this input stream into an array of bytes. read(byte[], int, int) Reads up to len bytes of data from this input stream into an array of bytes. reset() Repositions this stream to the position at the time the mark method was last called on this input stream. skip(long) Skips over and discards n bytes of data from this input stream. InputStream public InputStream() read public abstract int read() throws Reads the next byte of data from this input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. A subclass must provide an implementation of this method. Returns: the next byte of d...

• readAllBytes() Method in Java • toByteArray() Method in Java • write() Method in Java • readAllBytes() Method in Java • readFully() Method in Java • getBytes() Method in Java • • toByteArray() Method in Java This tutorial introduces how to convert inputstream to byte array in Java and lists some example codes to understand the topic. InputStream is an abstract class and superclass of all the classes that represent an input stream of bytes. Java uses an input stream to read data from any source like file, array, etc. We will then see how to convert this stream to byte array by using some built-in methods and custom code in Java. In this article, we will use several built-in methods such as toByteArray(), readAllBytes(), readFully(), getBytes(), write(), etc and a text file abc.txt is used to read data. This text file contains a single sentence, Welcome to Delfstack, that we will be read and converted into a byte array, which further can be converted into a string to check the desired result. Convert InputStream to Byte Array Using the readAllBytes() Method in Java We can use the readAllBytes() method to get all the data into a byte array. This method returns a byte array that can be passed further into the String constructor to print textual data. import java.io.FileInputStream ; import java.io.IOException ; import java.io.InputStream ; public class SimpleTesting Output: Welcome to Delfstack Convert InputStream to Byte Array Using the toByteArray() Method in Java If you ...

This abstract class is the superclass of all classes representing an input stream of bytes. Applications that need to define a subclass of InputStream must always provide a method that returns the next byte of input. Since: 1.0 See Also: BufferedInputStream, ByteArrayInputStream, DataInputStream, FilterInputStream, read(), OutputStream, PushbackInputStream Returns a new InputStream that reads no bytes. The returned stream is initially open. The stream is closed by calling the close() method. Subsequent calls to close() have no effect. While the stream is open, the available(), read(), read(byte[]), read(byte[], int, int), readAllBytes(), readNBytes(byte[], int, int), readNBytes(int), skip(long), and transferTo() methods all behave as if end of stream has been reached. After the stream has been closed, these methods all throw IOException. The markSupported() method returns false. The mark() method does nothing, and the reset() method throws IOException. Returns: an InputStream which contains no bytes Since: 11 • read public abstractintread() throws Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. A subclass must provide an implementation of this method. Returns: the next byte of data, or -1 if the end of th...

Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown. A subclass must provide an implementation of this method. Returns: the next byte of data, or -1 if the end of the stream is reached. Throws: • read Reads some number of bytes from the input stream and stores them into the buffer array b. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown. If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at the end of the file, the value -1 is returned; otherwise, at least one byte is read and stored into b. The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is, at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[ k -1], leaving elements b[ k ] through b[b.length-1] unaffected. The read(b) method for class InputStream has the same effect as: read(b, 0, b.length) Parameters: b - the buffer into which the data is read. Returns: the total number of bytes read i...