feat: add PrintStream-based student record writer

WHAT:
- Implemented `PrintStreamDemo` to demonstrate writing structured student data into a text file.
- Used `PrintStream` for writing primitive values and strings in a human-readable format.

HOW:
- Created `Student` class with fields: rollno, name, dept.
- Instantiated a `Student` object and populated its fields.
- Used `PrintStream` methods (`println()`) to write the student's roll number, name, and department into `Student1.txt`.
- Closed resources (`ps`, `fos`) to avoid memory leaks.

WHY:
- Showcases the difference between binary I/O (`DataOutputStream`) and text-based I/O (`PrintStream`).
- `PrintStream` provides convenient `print()` and `println()` methods similar to `System.out`, making it ideal for logging and text file writing.
- Output file is human-readable, unlike binary streams.

REAL-WORLD APPLICATIONS:
- Writing logs, reports, or configuration files where human readability is important.
- Exporting application data (like student records, employee details) in plain text format.
- Useful for quick debugging by persisting object state into a readable file.

NOTES:
- Unlike `DataOutputStream`, `PrintStream` writes data as text rather than binary.
- The order of writing still matters if another program will parse this file later.
- `PrintStream` does not throw `IOException` directly; instead, you should check for errors using `ps.checkError()` if required.

NEXT IMPROVEMENTS:
- Add a constructor to `Student` class for easier initialization.
- Wrap file operations in `try-with-resources` for automatic closing.
- Extend program to handle multiple student records (possibly using a loop or list).

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section23JavaIOStreams/Serialisation Storing Data in a File/src/PrintStreamExample.java

@@ -1,24 +1,24 @@
 import java.io.*;
-class Student
-{
+
+class Student {
     int rollno;
     String name;
     String dept;
 
-   /* // Constructor to initialize Student object
+    /* Constructor to initialize Student object
     public Student(int rollno, String name, String dept)
     {
         this.rollno = rollno;
         this.name = name;
         this.dept = dept;
-    }*/
+    }
+    */
 }
-class PrintStreamDemo
-{
-    public static void main(String[] args) throws Exception
-    {
-        FileOutputStream fos=new FileOutputStream("C:\\Users\\somes\\Downloads\\JAVA SE\\Section23JavaIOStreams\\Serialisation Storing Data in a File\\MyJAVA\\Student1.txt");
-        PrintStream ps=new PrintStream(fos);
+
+class PrintStreamDemo {
+    public static void main(String[] args) throws Exception {
+        FileOutputStream fos = new FileOutputStream("/Users/somesh/Java SE/JavaEvolution-Learning-Growing-Mastering/Section23JavaIOStreams/src/MyJAVA/Student1.txt");
+        PrintStream ps = new PrintStream(fos);
 
         Student s=new Student();
         s.rollno=10;
@@ -38,4 +38,4 @@ public static void main(String[] args) throws Exception
         ps.close();
         fos.close();
     }
-}
+}