Friday, May 24, 2013

Finding Object In Binary File - Java | Dream.In.Code


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    3 Replies - 0 Views - Last Post: 15 minutes ago Rate Topic: -----

    #1 Astro52a9 ?Icon User is online

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    Posted 35 minutes ago

    i have this binary file that keeps records of student but i dont seem to be able to only access the student i want
    part that read and prints out the message
    
 	while (true) {  				student = (Q4) input.readObject(); 				g++; 				 				if(student.getStudentName()=="Michel"){ 					System.out.println("Hello Michel"); 					//student.setStudentID(0); 				}else{ 					System.out.printf( 							"\n%-20S%-20S%.2f", 							student.getStudentName(), 							student.getStudentID(), 							student.averageMark(student.getMark(), 									student.getCredit())); 				} 

    my records

    when i run this i get this result instead of Hello Michel

    
 NAME                STUDENT ID          AVERAGE MARK NIMA                1                   1.11 REZA                5478                7.50 DAVID               456789              8.33 DANIEL              456789              5.00 JOHN                4561237             5.00 MARYAM              456123789           7.50 MAZDAK              4561238             6.67 HELLO               123456              6.67 MICHEL              123                 6.67  Number of Student(s) in record file: 9 


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    Replies To: Finding object in binary file

    #2 macosxnerd101 ?Icon User is online

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    Re: Finding object in binary file

    Posted 24 minutes ago

    Don't compare Strings using the == operator, as it compares their memory locations. Use the String equals() method instead, which will compare their literal values.


    #3 Astro52a9 ?Icon User is online

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    Re: Finding object in binary file

    Posted 17 minutes ago

    Thank you
    i always forget that

    one more question
    is there a way to update my objects in my binary file or i have to read the whole file and update it and then write it back into another file ?


    #4 macosxnerd101 ?Icon User is online

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    Re: Finding object in binary file

    Posted 15 minutes ago

    A RandomAccessFile will let you overwrite individual bytes. Really though, if you're modifying and updating new Objects, it would be better just to write a new File.

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    Source: http://www.dreamincode.net/forums/topic/321713-finding-object-in-binary-file/

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