Java - SequenceInputStream close() method

---

---

Description

The Java SequenceInputStream close() method closes this input stream and releases any system resources associated with the stream. A closed SequenceInputStream cannot perform input operations and cannot be reopened.

Declaration

Following is the declaration for java.io.SequenceInputStream.close() method.

 public void close() 

Parameters

NA

Return Value

This method does not return a value.

Exception

• IOException − If an I/O error occurs.

Example - Usage of SequenceInputStream close() method

The following example shows the usage of SequenceInputStream close() method.

SequenceInputStreamDemo.java

 package com.tutorialspoint; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.SequenceInputStream; public class SequenceInputStreamDemo { public static void main(String[] args) { // create two new strings with 5 characters each String s1 = "Hello"; String s2 = "World"; // create 2 input streams byte[] b1 = s1.getBytes(); byte[] b2 = s2.getBytes(); ByteArrayInputStream is1 = new ByteArrayInputStream(b1); ByteArrayInputStream is2 = new ByteArrayInputStream(b2); // create a new Sequence Input Stream SequenceInputStream sis = new SequenceInputStream(is1, is2); try { // read 10 characters, 5 from each stream for (int i = 0; i < 10; i++) { char c = (char) sis.read(); System.out.print(c); } // change line System.out.println(); // start closing the streams System.out.println("Closing Streams..."); // close the streams sis.close(); is1.close(); is2.close(); // print message for closed streams System.out.println("Streams Closed."); } catch (IOException ex) { ex.printStackTrace(); } } } 

Output

Let us compile and run the above program, this will produce the following result −

 HelloWorld Closing Streams... Streams Closed. 

Example - Properly closing a SequenceInputStream after reading

The following example shows the usage of SequenceInputStream close() method.

SequenceInputStreamDemo.java

 package com.tutorialspoint; import java.io.ByteArrayInputStream; import java.io.SequenceInputStream; import java.io.IOException; public class SequenceInputStreamDemo { public static void main(String[] args) { try { ByteArrayInputStream input1 = new ByteArrayInputStream("Java".getBytes()); ByteArrayInputStream input2 = new ByteArrayInputStream("Stream".getBytes()); SequenceInputStream sis = new SequenceInputStream(input1, input2); int data; while ((data = sis.read()) != -1) { System.out.print((char) data); } sis.close(); // Closes SequenceInputStream and both ByteArrayInputStreams System.out.println("\nStream closed successfully."); } catch (IOException e) { e.printStackTrace(); } } } 

Output

Let us compile and run the above program, this will produce the following result−

 JavaStream Stream closed successfully. 

Explanation

• The stream reads from both sources ("JavaStream").

• After reading,close() is called to release all underlying resources.

• This is good practice in all I/O code.

Example - Attempting to read after closing the stream

The following example shows the usage of SequenceInputStream close() method.

SequenceInputStreamDemo.java

 package com.tutorialspoint; import java.io.ByteArrayInputStream; import java.io.SequenceInputStream; import java.io.IOException; public class SequenceInputStreamDemo { public static void main(String[] args) { try { ByteArrayInputStream input1 = new ByteArrayInputStream("ABC".getBytes()); ByteArrayInputStream input2 = new ByteArrayInputStream("DEF".getBytes()); SequenceInputStream sis = new SequenceInputStream(input1, input2); sis.close(); // Close the stream immediately // Try to read after closing int data = sis.read(); // This should throw an exception System.out.println("Data: " + (char) data); } catch (IOException e) { System.out.println("Exception: Cannot read after closing the stream."); } } } 

Output

Let us compile and run the above program, this will produce the following result−

 Data: ? 

Explanation

• The SequenceInputStream is closed before any reading.

• A read attempt afterward causes an IOException.