Generally the input stream acts as a source to the data like file or connection. The Java.io ByteArrayInputStream is the class used to reading the bytes into internal buffer from the array as bytes. Through the Java.io ByteArrayInputStream the array bytes are enclose to change into a stream.

In case of Java.io ByteArrayInputStream the methods that are called after closing the stream only when no I/O exceptions occurred. The byte array input stream is subclass to the class called input stream.

Java.io ByteArrayInputStream class is declared below: Public class ByteArrayInputStream extends InputStream

Java.io/ByteArrayInputStream class fields are:

• Protected int mark : The field represents the presently position that have been marked in the stream.
• Protected int Count : The field represents to the index to count input stream buffer after the last character.
• Protected byte [] bu : The field represents to the internal buffer where actually the data  stored.
• Protected int pos : The field represents to the position of input stream to read that coming character.

From the following classes , methods are inherited to the byte arrray input stream class.

• Java.io.object
• Java.io.InputStream

Usage of void close() method. [c]import java.io.ByteArrayInputStream; import java.io.IOException; public class ByteArrayInputStream { public static void main(String[] args) throws IOException { byte[] buf = {66, 69, 68, 67}; ByteArrayInputStream bais = null; try{ // creating new byte array input stream bais = new ByteArrayInputStream(buf); // close appeal before read() and available() bais.close(); int count =0; // read till to the end of the stream while((count = bais.available())>0) { // To convert byte into character char c = (char)bais.read(); // print number of bytes that are available System.out.print("available bytes : "+ count); // print characters which are reads form the byte array System.out.println(" read byte : "+c); } }catch(Exception e) { // if I/O error occurs e.printStackTrace(); }finally { if(bais!=null) bais.close(); } } }[/c] Output Following is the result will be displayed. [c] available bytes : 4 read byte : B available bytes : 3 read byte : E available bytes : 2 read byte : D available bytes : 1 read byte : C [/c] Usage of Boolean markSupported() method. [c]import java.io.ByteArrayInputStream; import java.io.IOException; public class ByteArrayInputStream { public static void main(String[] args) throws IOException { byte[] buf = {65, 66, 67, 68, 69}; ByteArrayInputStream bais = null; try{ // creating a new byte array input stream bais = new ByteArrayInputStream(buf); // It checks whether mark() and reset() methods supported boolean isMarkSupported = bais.markSupported(); System.out.println("mark supported : "+isMarkSupported); System.out.println("proof:"); // print bytes System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Mark() invocation method"); // To mark() invocation bais.mark(0); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); System.out.println("Reset() invocation method"); // To reset() invocation bais.reset(); System.out.println("Byte read "+ bais.read()); System.out.println("Byte read "+ bais.read()); }catch(Exception e) { // if I/O error occurs e.printStackTrace(); }finally { if(bais!=null) bais.close(); } } }[/c] Output Following is the result will be displayed. [c]mark supported : true proof: Byte read 65 Byte read 66 Byte read 67 Mark() invocation method Byte read 68 Byte read 69 Reset() invocation method Byte read 68 Byte read 69 [/c]

• Generally the input stream acts as a source to the data like file or connection.
• The byte array input stream is the class used to reading the bytes into internal buffer from the array as bytes.
• Through the byte array input stream the array bytes are enclose to change into a stream.