[Solved] Search Student in File

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You are reading lines from the file and assigning its content to str, but you never do something with this value.

Also, Student seems to be empty.

Supposing your file includes only the ID of the student:

BufferedReader read = new BufferedReader(new FileReader(file));
    String str;
     while((str=read.readLine())!=null)
     {
        // Your constructor assigns str to ID property of Student
        // Casting to Integer, because ID is a number
        Student s = new Student(Integer.valueOf(str)); 

        if(s.getId()==id)
            System.out.println(s.print());
     }

Also, make sure your print() method in Student really prints what you want.

solved Search Student in File