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 # Class: BufferedRandomAccessFile

 Last update: 22.06.2026 

**Package:** `com.phoenix_int.util`

**Class Hierarchy**

```java
↳ java.lang.Object
  ↳ com.phoenix_int.util.BufferedRandomAccessFile

```

---

**Declaration**

```java
public class BufferedRandomAccessFile
extends java.lang.Object

```

Replacement for RandomAccessFile to use buffered I/O as much as possible. Mostly identical to `java.io.RandomAccessFile` API, or at least as close enough for what I needed.

**Note:** This class is not threadsafe.

## Field Summary

Modifier and TypeField and Description`protected long``_actualPos``protected byte[]``_buffer``protected long``_bufStart``protected long``_fileLen``protected long``_filePos``protected int``_readOffset``protected java.io.RandomAccessFile``_wrapped``protected int``_writeOffset`## Constructor Summary

Constructor and Description`BufferedRandomAccessFile(java.io.File file, java.lang.String mode, int bufSize)`   
Constructs a BufferedRandomAccessFile## Method Summary

Modifier and TypeMethod and Description`boolean``_readBuf()``void``close()``void``flush()``long``length()``int``read()``int``read(byte[] buf)``int``read(byte[] buf, int offset, int len)``void``seek(long position)``void``write(byte[] buf)``void``write(byte[] buf, int offset, int len)`### Methods inherited from class java.lang.Object

`clone`, `equals`, `finalize`, `getClass`, `hashCode`, `notify`, `notifyAll`, `toString`, `wait`, `wait`, `wait`

## Field Detail

### \_wrapped

```java
protected java.io.RandomAccessFile _wrapped

```

### \_filePos

```java
protected long _filePos

```

### \_fileLen

```java
protected long _fileLen

```

### \_actualPos

```java
protected long _actualPos

```

### \_bufStart

```java
protected long _bufStart

```

### \_buffer

```java
protected byte[] _buffer

```

### \_writeOffset

```java
protected int _writeOffset

```

### \_readOffset

```java
protected int _readOffset

```

## Constructor Detail

### BufferedRandomAccessFile

```java
public BufferedRandomAccessFile(java.io.File file,
                                java.lang.String mode,
                                int bufSize)
                         throws java.io.IOException

```

**Parameters:**

- `file` - The file to open
- `mode` - Same as for RandomAccessFile's constructor
- `bufSize` - How big to make the in-memory cache.

**Throws:**

- `java.io.IOException`

## Method Detail

### length

```java
public long length()
            throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### seek

```java
public void seek(long position)

```

### close

```java
public void close()
           throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### write

```java
public void write(byte[] buf)
           throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### write

```java
public void write(byte[] buf,
                  int offset,
                  int len)
           throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### flush

```java
public void flush()
           throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### read

```java
public int read()
         throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### read

```java
public int read(byte[] buf)
         throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### read

```java
public int read(byte[] buf,
                int offset,
                int len)
         throws java.io.IOException

```

**Throws:**

- `java.io.IOException`

### \_readBuf

```java
public boolean _readBuf()
                 throws java.io.IOException

```

**Throws:**

- `java.io.IOException`