ЁЯУД Random Access Files in Java рдЬाрд╡ा рдоें рд░ैंрдбрдо рдПрдХ्рд╕ेрд╕ рдлाрдЗрд▓्рд╕
In Java, Random Access Files allow us to read and write data from any position in a file without reading it sequentially.
рдЬाрд╡ा рдоें рд░ैंрдбрдо рдПрдХ्рд╕ेрд╕ рдлाрдЗрд▓्рд╕ рд╣рдоें рдлाрдЗрд▓ рдХे рдХिрд╕ी рднी рд╕्рдеाрди рд╕े рдбेрдЯा рдкрдв़рдиे рдФрд░ рд▓िрдЦрдиे рдХी рдЕрдиुрдорддि рджेрддी рд╣ैं, рдмिрдиा рдЙрд╕े рдХ्рд░рдорд╡ाрд░ рдкрдв़े।
Key Features / рдоुрдЦ्рдп рд╡िрд╢ेрд╖рддाрдПँ:-
-
Direct Access: We can move to any file position using a file pointer.
рдбाрдпрд░ेрдХ्рдЯ рдПрдХ्рд╕ेрд╕: рд╣рдо рдлाрдЗрд▓ рдкॉрдЗंрдЯрд░ рдХा рдЙрдкрдпोрдЧ рдХрд░рдХे рдлाрдЗрд▓ рдоें рдХिрд╕ी рднी рд╕्рдеाрди рдкрд░ рдЬा рд╕рдХрддे рд╣ैं। -
Read and Write Both: Same file can be used for reading and writing.
рд░ीрдб рдФрд░ рд░ाрдЗрдЯ рджोрдиों: рдПрдХ рд╣ी рдлाрдЗрд▓ рд╕े рдкрдв़ рдФрд░ рдЙрд╕рдоें рд▓िрдЦ рд╕рдХрддे рд╣ैं। -
Class Used:
RandomAccessFile
(fromjava.io
package).
рдЙрдкрдпोрдЧ рдХी рдЧрдИ рдХ्рд▓ाрд╕:RandomAccessFile
(java.io
рдкैрдХेрдЬ рд╕े)।
ЁЯТ╗ Example 1: Writing to Random Access File
import java.io.*;
public class RandomAccessWrite {
public static void main(String[] args) {
try {
RandomAccessFile raf = new RandomAccessFile("random.txt", "rw");
raf.writeUTF("Hello Random File");
raf.writeInt(12345);
raf.writeDouble(99.99);
raf.close();
System.out.println("Data written successfully!");
} catch (IOException e) {
System.out.println("Error: " + e);
}
}
}
Output in Console:
Data written successfully!
File Content (binary, not human-readable): Stored in mixed binary format.
ЁЯТ╗ Example 2: Reading Specific Data from Random Access File
import java.io.*;
public class RandomAccessRead {
public static void main(String[] args) {
try {
RandomAccessFile raf = new RandomAccessFile("random.txt", "r");
System.out.println("String: " + raf.readUTF());
System.out.println("Integer: " + raf.readInt());
System.out.println("Double: " + raf.readDouble());
raf.close();
} catch (IOException e) {
System.out.println("Error: " + e);
}
}
}
Output:
String: Hello Random File
Integer: 12345
Double: 99.99
ЁЯТ╗ Example 3: Jump to a Specific Position
import java.io.*;
public class RandomAccessSeek {
public static void main(String[] args) {
try {
RandomAccessFile raf = new RandomAccessFile("random.txt", "rw");
raf.seek(0); // Move pointer to start
System.out.println("First UTF: " + raf.readUTF());
raf.seek(raf.length()); // Move to end and append
raf.writeUTF(" - Appended Text");
raf.close();
System.out.println("Data appended successfully!");
} catch (IOException e) {
System.out.println("Error: " + e);
}
}
}
Output:
First UTF: Hello Random File
Data appended successfully!
ЁЯФ╣ Real-life Uses / рд╡ाрд╕्рддрд╡िрдХ рдЙрдкрдпोрдЧ
-
Database Systems: Direct record access without reading full file.
рдбेрдЯाрдмेрд╕ рд╕िрд╕्рдЯрдо: рдкूрд░ी рдлाрдЗрд▓ рдкрдв़े рдмिрдиा рд░िрдХॉрд░्рдб рддрдХ рдкрд╣ुँрдЪрдиा। -
Media Players: Jumping to a specific timestamp in audio/video files.
рдоीрдбिрдпा рдк्рд▓ेрдпрд░: рдХिрд╕ी рд╡िрд╢ेрд╖ рд╕рдордп рдкрд░ рдЬाрдиे рдХे рд▓िрдП। -
File Editors: Modify files without rewriting them completely.
рдлाрдЗрд▓ рдПрдбिрдЯрд░: рдкूрд░ी рдлाрдЗрд▓ рдлिрд░ рд╕े рд▓िрдЦे рдмिрдиा рд╕ंрд╢ोрдзрди рдХрд░рдиा।
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