Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Ctors](https://developer.android.com/reference/java/io/SequenceInputStream#pubctors) \| [Methods](https://developer.android.com/reference/java/io/SequenceInputStream#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/java/io/SequenceInputStream#inhmethods)

# SequenceInputStream

` public class SequenceInputStream `   
` ` ` extends https://developer.android.com/reference/java/io/InputStream ` ` `

|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.io.InputStream](https://developer.android.com/reference/java/io/InputStream) ||
|   | ↳ | java.io.SequenceInputStream |

<br />

*** ** * ** ***

A `SequenceInputStream` represents the logical concatenation of other input streams. It starts out with an ordered collection of input streams and reads from the first one until end of file is reached, whereupon it reads from the second one, and so on, until end of file is reached on the last of the contained input streams.

## Summary

| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/java/io/SequenceInputStream#SequenceInputStream(java.io.InputStream,%20java.io.InputStream)(https://developer.android.com/reference/java/io/InputStream s1, https://developer.android.com/reference/java/io/InputStream s2) ` Initializes a newly created `SequenceInputStream` by remembering the two arguments, which will be read in order, first `s1` and then `s2`, to provide the bytes to be read from this `SequenceInputStream`. |
| ` https://developer.android.com/reference/java/io/SequenceInputStream#SequenceInputStream(java.util.Enumeration<?%20extends%20java.io.InputStream>)(https://developer.android.com/reference/java/util/Enumeration<? extends https://developer.android.com/reference/java/io/InputStream> e) ` Initializes a newly created `SequenceInputStream` by remembering the argument, which must be an `Enumeration` that produces objects whose run-time type is `InputStream`. |

| ### Public methods ||
|---|---|
| ` int` | ` https://developer.android.com/reference/java/io/SequenceInputStream#available()() ` Returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking by the next invocation of a method for the current underlying input stream. |
| ` void` | ` https://developer.android.com/reference/java/io/SequenceInputStream#close()() ` Closes this input stream and releases any system resources associated with the stream. |
| ` int` | ` https://developer.android.com/reference/java/io/SequenceInputStream#read()() ` Reads the next byte of data from this input stream. |
| ` int` | ` https://developer.android.com/reference/java/io/SequenceInputStream#read(byte[],%20int,%20int)(byte[] b, int off, int len) ` Reads up to `len` bytes of data from this input stream into an array of bytes. |

### Inherited methods

From class ` https://developer.android.com/reference/java/io/InputStream ` ` int` ` https://developer.android.com/reference/java/io/InputStream#available()() `

Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking, which may be 0, or 0 when end of stream is detected.
` void` ` https://developer.android.com/reference/java/io/InputStream#close()() `

Closes this input stream and releases any system resources associated with the stream.
` void` ` https://developer.android.com/reference/java/io/InputStream#mark(int)(int readlimit) `

Marks the current position in this input stream.
` boolean` ` https://developer.android.com/reference/java/io/InputStream#markSupported()() `

Tests if this input stream supports the `mark` and `reset` methods.
` static https://developer.android.com/reference/java/io/InputStream` ` https://developer.android.com/reference/java/io/InputStream#nullInputStream()() `

Returns a new `InputStream` that reads no bytes.
` int` ` https://developer.android.com/reference/java/io/InputStream#read(byte[])(byte[] b) `

Reads some number of bytes from the input stream and stores them into the buffer array `b`.
` abstract int` ` https://developer.android.com/reference/java/io/InputStream#read()() `

Reads the next byte of data from the input stream.
` int` ` https://developer.android.com/reference/java/io/InputStream#read(byte[],%20int,%20int)(byte[] b, int off, int len) `

Reads up to `len` bytes of data from the input stream into an array of bytes.
` byte[]` ` https://developer.android.com/reference/java/io/InputStream#readAllBytes()() `

Reads all remaining bytes from the input stream.
` int` ` https://developer.android.com/reference/java/io/InputStream#readNBytes(byte[],%20int,%20int)(byte[] b, int off, int len) `

Reads the requested number of bytes from the input stream into the given byte array.
` byte[]` ` https://developer.android.com/reference/java/io/InputStream#readNBytes(int)(int len) `

Reads up to a specified number of bytes from the input stream.
` void` ` https://developer.android.com/reference/java/io/InputStream#reset()() `

Repositions this stream to the position at the time the `mark` method was last called on this input stream.
` long` ` https://developer.android.com/reference/java/io/InputStream#skip(long)(long n) `

Skips over and discards `n` bytes of data from this input stream.
` void` ` https://developer.android.com/reference/java/io/InputStream#skipNBytes(long)(long n) `

Skips over and discards exactly `n` bytes of data from this input stream.
` long` ` https://developer.android.com/reference/java/io/InputStream#transferTo(java.io.OutputStream)(https://developer.android.com/reference/java/io/OutputStream out) `

Reads all bytes from this input stream and writes the bytes to the given output stream in the order that they are read.
From class ` https://developer.android.com/reference/java/lang/Object ` ` https://developer.android.com/reference/java/lang/Object` ` https://developer.android.com/reference/java/lang/Object#clone()() `

Creates and returns a copy of this object.
` boolean` ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) `

Indicates whether some other object is "equal to" this one.
` void` ` https://developer.android.com/reference/java/lang/Object#finalize()() `

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
` final https://developer.android.com/reference/java/lang/Class<?>` ` https://developer.android.com/reference/java/lang/Object#getClass()() `

Returns the runtime class of this `Object`.
` int` ` https://developer.android.com/reference/java/lang/Object#hashCode()() `

Returns a hash code value for the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#notify()() `

Wakes up a single thread that is waiting on this object's monitor.
` final void` ` https://developer.android.com/reference/java/lang/Object#notifyAll()() `

Wakes up all threads that are waiting on this object's monitor.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Object#toString()() `

Returns a string representation of the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait()() `

Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*.
From interface ` https://developer.android.com/reference/java/io/Closeable ` ` abstract void` ` https://developer.android.com/reference/java/io/Closeable#close()() `

Closes this stream and releases any system resources associated with it.
From interface ` https://developer.android.com/reference/java/lang/AutoCloseable ` ` abstract void` ` https://developer.android.com/reference/java/lang/AutoCloseable#close()() `

Closes this resource, relinquishing any underlying resources.

## Public constructors

### SequenceInputStream

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public SequenceInputStream (InputStream s1, 
                InputStream s2)
```

Initializes a newly created `SequenceInputStream` by remembering the two arguments, which will be read in order, first `s1` and then `s2`, to provide the bytes to be read from this `SequenceInputStream`.

<br />

| Parameters ||
|---|---|
| `s1` | `InputStream`: the first input stream to read. <br /> |
| `s2` | `InputStream`: the second input stream to read. <br /> |

### SequenceInputStream

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public SequenceInputStream (Enumeration<? extends InputStream> e)
```

Initializes a newly created `SequenceInputStream` by remembering the argument, which must be an `Enumeration` that produces objects whose run-time type is `InputStream`. The input streams that are produced by the enumeration will be read, in order, to provide the bytes to be read from this `SequenceInputStream`. After each input stream from the enumeration is exhausted, it is closed by calling its `close` method.

<br />

| Parameters ||
|---|---|
| `e` | `Enumeration`: an enumeration of input streams. <br /> |

**See also:**

- `https://developer.android.com/reference/java/util/Enumeration`

## Public methods

### available

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public int available ()
```

Returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking by the next invocation of a method for the current underlying input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

This method simply calls `available` of the current underlying input stream and returns the result.

<br />

| Returns ||
|---|---|
| `int` | an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking or `0` if this input stream has been closed by invoking its `https://developer.android.com/reference/java/io/SequenceInputStream#close()` method <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/io/IOException` | if an I/O error occurs. |

### close

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public void close ()
```

Closes this input stream and releases any system resources associated with the stream. A closed `SequenceInputStream` cannot perform input operations and cannot be reopened.

If this stream was created from an enumeration, all remaining elements are requested from the enumeration and closed before the `close` method returns.

<br />

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/io/IOException` | if an I/O error occurs. |

### read

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public int read ()
```

Reads the next byte of data from this input stream. The 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 tries to read one character from the current substream. If it reaches the end of the stream, it calls the `close` method of the current substream and begins reading from the next substream.

<br />

| Returns ||
|---|---|
| `int` | the next byte of data, or `-1` if the end of the stream is reached. <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/io/IOException` | if an I/O error occurs. |

### read

Added in [API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public int read (byte[] b, 
                int off, 
                int len)
```

Reads up to `len` bytes of data from this input stream into an array of bytes. If `len` is not zero, the method blocks until at least 1 byte of input is available; otherwise, no bytes are read and `0` is returned.

The `read` method of `SequenceInputStream` tries to read the data from the current substream. If it fails to read any characters because the substream has reached the end of the stream, it calls the `close` method of the current substream and begins reading from the next substream.

<br />

| Parameters ||
|---|---|
| `b` | `byte`: the buffer into which the data is read. <br /> |
| `off` | `int`: the start offset in array `b` at which the data is written. <br /> |
| `len` | `int`: the maximum number of bytes read. <br /> |

| Returns ||
|---|---|
| `int` | int the number of bytes read. <br /> |

| Throws ||
|---|---|
| `https://developer.android.com/reference/java/io/IOException` | if an I/O error occurs. |
| `https://developer.android.com/reference/java/lang/IndexOutOfBoundsException` | If `off` is negative, `len` is negative, or `len` is greater than `b.length - off` |
| `https://developer.android.com/reference/java/lang/NullPointerException` | If `b` is `null`. |