- Java.io package classes
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- Java.io - BufferedInputStream
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- Java.io - ByteArrayOutputStream
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- Java.io - DataInputStream
- Java.io - DataOutputStream
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- Java.io - FileInputStream
- Java.io - FileOutputStream
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- Java.io - FilterInputStream
- Java.io - FilterOutputStream
- Java.io - FilterReader
- Java.io - FilterWriter
- Java.io - InputStream
- Java.io - InputStreamReader
- Java.io - LineNumberInputStream
- Java.io - LineNumberReader
- Java.io - ObjectInputStream
- Java.io - ObjectInputStream.GetField
- Java.io - ObjectOutputStream
- io - ObjectOutputStream.PutField
- Java.io - ObjectStreamClass
- Java.io - ObjectStreamField
- Java.io - OutputStream
- Java.io - OutputStreamWriter
- Java.io - PipedInputStream
- Java.io - PipedOutputStream
- Java.io - PipedReader
- Java.io - PipedWriter
- Java.io - PrintStream
- Java.io - PrintWriter
- Java.io - PushbackInputStream
- Java.io - PushbackReader
- Java.io - RandomAccessFile
- Java.io - Reader
- Java.io - SequenceInputStream
- Java.io - SerializablePermission
- Java.io - StreamTokenizer
- Java.io - StringBufferInputStream
- Java.io - StringReader
- Java.io - StringWriter
- Java.io - Writer
- Java.io package extras
- Java.io - Interfaces
- Java.io - Exceptions
- Java.io package Useful Resources
- Java.io - Discussion
Java.io.PushbackInputStream.read() Method
Description
The java.io.PushbackInputStream.read() method 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.
This method returns the most recently pushed-back byte, if there is one, and otherwise calls the read method of its underlying input stream and returns whatever value that method returns.
Declaration
Following is the declaration for java.io.PushbackInputStream.read() method.
public int read()
Parameters
NA
Return Value
This method returns the next byte of data, or -1 if the end of the stream has been reached.
Exception
IOException − If this input stream has been closed by invoking its close() method, or an I/O error occurs.
Example
The following example shows the usage of java.io.PushbackInputStream.read() method.
package com.tutorialspoint; import java.io.*; public class PushbackInputStreamDemo { public static void main(String[] args) { // declare a buffer and initialize its size: byte[] arrByte = new byte[1024]; // create an array for our message byte[] byteArray = new byte[]{'H', 'e', 'l', 'l', 'o'}; // create object of PushbackInputStream class for specified stream InputStream is = new ByteArrayInputStream(byteArray); PushbackInputStream pis = new PushbackInputStream(is); try { // read from the buffer one character at a time for (int i = 0; i < byteArray.length; i++) { // read a char into our array arrByte[i] = (byte) pis.read(); // display the read byte System.out.print((char) arrByte[i]); } } catch (Exception ex) { ex.printStackTrace(); } } }
Let us compile and run the above program, this will produce the following result −
Hello