📅  最后修改于: 2020-11-15 02:51:26             🧑  作者: Mango
Java.io.RandomAccessFile类文件的行为类似于存储在文件系统中的大字节数组。此类的实例支持读取和写入随机访问文件。
以下是Java.io.RandomAccessFile类的声明-
public class RandomAccessFile
extends Object
implements DataOutput, DataInput, Closeable
Sr.No. | Constructor & Description |
---|---|
1 |
RandomAccessFile(File file, String mode) This creates a random access file stream to read from, and optionally to write to, the file specified by the File argument. |
2 |
RandomAccessFile(File file, String mode) This creates a random access file stream to read from, and optionally to write to, a file with the specified name. |
Sr.No. | Method & Description |
---|---|
1 | void close()
This method Closes this random access file stream and releases any system resources associated with the stream. |
2 | FileChannel getChannel()
This method returns the unique FileChannel object associated with this file. |
3 | FileDescriptor getFD()
This method returns the opaque file descriptor object associated with this stream. |
4 | long getFilePointer()
This method returns the current offset in this file. |
5 | long length()
This method returns the length of this file. |
6 | int read()
This method reads a byte of data from this file. |
7 | int read(byte[] b)
This method reads up to b.length bytes of data from this file into an array of bytes. |
8 | int read(byte[] b, int off, int len)
This method reads up to len bytes of data from this file into an array of bytes. |
9 | boolean readBoolean()
This method reads a boolean from this file. |
10 | byte readByte()
This method reads a signed eight-bit value from this file. |
11 | char readChar()
This method reads a character from this file. |
12 | double readDouble()
This method reads a double from this file. |
13 | float readFloat()
This method reads a float from this file. |
14 | void readFully(byte[] b)
This method reads b.length bytes from this file into the byte array, starting at the current file pointer. |
15 | void readFully(byte[] b, int off, int len)
This method reads exactly len bytes from this file into the byte array, starting at the current file pointer. |
16 | int readInt()
This method reads a signed 32-bit integer from this file. |
17 | String readLine()
This method reads the next line of text from this file. |
18 | long readLong()
This method reads a signed 64-bit integer from this file. |
19 | short readShort()
This method reads a signed 16-bit number from this file. |
20 | int readUnsignedByte()
This method reads an unsigned eight-bit number from this file. |
21 | int readUnsignedShort()
This method reads an unsigned 16-bit number from this file. |
22 | String readUTF()
This method reads in a string from this file. |
23 | void seek(long pos)
This method sets the file-pointer offset, measured from the beginning of this file, at which the next read or write occurs. |
24 | void setLength(long newLength)
This method sets the length of this file. |
25 | int skipBytes(int n)
This method attempts to skip over n bytes of input discarding the skipped bytes. |
26 | void write(byte[] b)
This method writes b.length bytes from the specified byte array to this file, starting at the current file pointer. |
27 | void write(byte[] b, int off, int len)
This method writes len bytes from the specified byte array starting at offset off to this file. |
28 | void write(int b)
This method writes the specified byte to this file. |
29 | void writeBoolean(boolean v)
This method writes a boolean to the file as a one-byte value. |
30 | void writeByte(int v)
This method writes a byte to the file as a one-byte value. |
31 | void writeBytes(String s)
This method writes the string to the file as a sequence of bytes. |
32 | void writeChar(int v)
This method writes a char to the file as a two-byte value, high byte first. |
33 | void writeChars(String s)
This method writes a string to the file as a sequence of characters. |
34 | void writeDouble(double v)
This method converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the file as an eight-byte quantity, high byte first. |
35 | void writeFloat(float v)
This method converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the file as a four-byte quantity, high byte first. |
36 | void writeInt(int v)
This method writes an int to the file as four bytes, high byte first. |
37 | void writeLong(long v)
This method writes a long to the file as eight bytes, high byte first. |
38 | void writeShort(int v)
This method writes a short to the file as two bytes, high byte first. |
39 | void writeUTF(String str)
This method writes a string to the file using modified UTF-8 encoding in a machine-independent manner. |
此类从以下类继承方法-