**Inheritance:**
java.lang.Object, [com.aspose.zip.SevenZipCompressionSettings](../../com.aspose.zip/sevenzipcompressionsettings)
```
public class SevenZipLZMA2CompressionSettings extends SevenZipCompressionSettings
```

Settings for LZMA2 compression method within 7z archive.

LZMA2 supports multiple runs of compressed LZMA data and uncompressed data.

See more: [Lempel\\u2013Ziv\\u2013Markov\_chain\_algorithm][Lempel_u2013Ziv_u2013Markov_chain_algorithm]


[Lempel_u2013Ziv_u2013Markov_chain_algorithm]: https://en.wikipedia.org/wiki/Lempel\u2013Ziv\u2013Markov_chain_algorithm
## Constructors

| Constructor | Description |
| --- | --- |
| [SevenZipLZMA2CompressionSettings()](#SevenZipLZMA2CompressionSettings--) | Instantiates settings for LZMA2 compression method within 7z archive. |
| [SevenZipLZMA2CompressionSettings(int dictionarySize)](#SevenZipLZMA2CompressionSettings-int-) | Instantiates settings for LZMA2 compression method within 7z archive. |
| [SevenZipLZMA2CompressionSettings(int dictionarySize, int fastBytes)](#SevenZipLZMA2CompressionSettings-int-int-) | Instantiates settings for LZMA2 compression method within 7z archive. |
## Methods

| Method | Description |
| --- | --- |
| [getCompressionThreads()](#getCompressionThreads--) | Gets compression thread count. |
| [getDictionarySize()](#getDictionarySize--) | Dictionary (history buffer) size indicates how many bytes of the recently processed uncompressed data are kept in memory. |
| [getFastBytes()](#getFastBytes--) | Gets the control number of fast bytes used by the LZMA2 compressor. |
| [getMethod()](#getMethod--) | Gets compression or decompression method. |
| [setCompressionThreads(int value)](#setCompressionThreads-int-) | Sets compression thread count. |
### SevenZipLZMA2CompressionSettings() {#SevenZipLZMA2CompressionSettings--}
```
public SevenZipLZMA2CompressionSettings()
```


Instantiates settings for LZMA2 compression method within 7z archive.

### SevenZipLZMA2CompressionSettings(int dictionarySize) {#SevenZipLZMA2CompressionSettings-int-}
```
public SevenZipLZMA2CompressionSettings(int dictionarySize)
```


Instantiates settings for LZMA2 compression method within 7z archive.

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| dictionarySize | int | the size of history buffer, must be between 4096 and 1073741824.

The bigger the dictionary, usually the better the compression ratio is - but dictionaries larger than the uncompressed data are a waste of RAM. |

### SevenZipLZMA2CompressionSettings(int dictionarySize, int fastBytes) {#SevenZipLZMA2CompressionSettings-int-int-}
```
public SevenZipLZMA2CompressionSettings(int dictionarySize, int fastBytes)
```


Instantiates settings for LZMA2 compression method within 7z archive.

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| dictionarySize | int | the size of history buffer, must be between 4096 and 1073741824.

The bigger the dictionary, usually the better the compression ratio is - but dictionaries larger than the uncompressed data are a waste of RAM. |
| fastBytes | int | controls the number of fast bytes used by the LZMA2 compressors. A larger number of fast bytes can provide a better compression ratio at the expense of compression speed. |

### getCompressionThreads() {#getCompressionThreads--}
```
public final int getCompressionThreads()
```


Gets compression thread count. If the value is greater than 1, multithreading compression will be used.

**Returns:**
int - compression thread count
### getDictionarySize() {#getDictionarySize--}
```
public final int getDictionarySize()
```


Dictionary (history buffer) size indicates how many bytes of the recently processed uncompressed data are kept in memory.

**Returns:**
int - dictionary (history buffer) size
### getFastBytes() {#getFastBytes--}
```
public final int getFastBytes()
```


Gets the control number of fast bytes used by the LZMA2 compressor.

**Returns:**
int - the control number of fast bytes used by the LZMA2 compressor
### getMethod() {#getMethod--}
```
public SevenZipCompressionMethod getMethod()
```


Gets compression or decompression method.

**Returns:**
[SevenZipCompressionMethod](../../com.aspose.zip/sevenzipcompressionmethod) - compression or decompression method.
### setCompressionThreads(int value) {#setCompressionThreads-int-}
```
public final void setCompressionThreads(int value)
```


Sets compression thread count. If the value is greater than 1, multithreading compression will be used.

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| value | int | compression thread count.

Do not set this number more than CPU cores. |