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Tutorial Kata Kunci Transien Java – Variabel transien adalah variabel yang tidak dapat diserialisasi

Diterbitkan: 2020-08-23

Tutorial Kata Kunci Transien Java - Crunchify

Jika Anda memiliki persyaratan untuk membuat serial objek, maka Anda memiliki opsi untuk melewatkan bidang tertentu dengan marking it as transient .

transient adalah kata kunci Java yang menandai variabel anggota untuk tidak diserialisasi ketika dipertahankan untuk aliran byte.

Kapan Anda perlu membuat serial objek?

Ketika objek Java ditransfer melalui jaringan, objek needs to be serialized . Serialisasi mengubah status objek menjadi byte serial.

Mari kita lihat contoh Java sementara

  1. Pertama mari kita buat objek POJO CrunchifyTransientVariableObject yang mengimplementasikan Serializable.
  2. Buat kelas utama CrunchifyJavaTransientFieldTutorial.
    • Buat Objek.
    • Tulis Objek ke file. Aliran output file adalah aliran output untuk menulis data ke File atau FileDescriptor.
    • Membaca Objek.
    • Jika bidang bersifat sementara – ia akan mengembalikan 0 (untuk int), null (untuk bidang string) dan seterusnya.

CrunchifyTransientVariableObject.java

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package crunchify . com . tutorial ;
 
import java . io . Serializable ;
 
// Serializability of a class is enabled by the class implementing the java.io.Serializable interface.
// Warning: Deserialization of untrusted data is inherently dangerous and should be avoided.
// Untrusted data should be carefully validated according to the "Serialization and Deserialization" section of the . describes best practices for defensive use of serial filters.
public class CrunchifyTransientVariableObject implements Serializable {
 
     private static final long serialVersionUID = 1L ;
 
     private String companyName ;
 
     private int employeeCount ;
 
     // A transient variable is a variable that can not be serialized.
     // Variables may be marked transient to indicate that they are not part of the persistent state of an object.
 
     private transient int homeZip ;
     // private int homeZip;
 
     public String getName ( ) {
         return companyName ;
     }
 
     public void setName ( String companyName ) {
         this . companyName = companyName ;
     }
 
     public int getEmployeeCount ( ) {
         return employeeCount ;
     }
 
     public void setEmployeeCount ( int employeeCount ) {
         this . employeeCount = employeeCount ;
     }
 
     public int getZip ( ) {
         return homeZip ;
     }
 
     public void setZip ( int homeZip ) {
         this . homeZip = homeZip ;
     }
 
     public CrunchifyTransientVariableObject ( String companyName , int employeeCount , int homeZip ) {
         this . companyName = companyName ;
         this . employeeCount = employeeCount ;
         this . homeZip = homeZip ;
     }
 
}

Di sini homeZip adalah variabel sementara.

CrunchifyJavaTransientFieldTutorial.java

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package crunchify . com . tutorial ;
 
import java . io . * ;
 
/**
* @author Crunchify.com
*
*         Java Transient Keyword Tutorial - A transient variable is a variable that can not be serialized.
*
*/
public class CrunchifyJavaTransientFieldTutorial {
 
     public static void main ( String [ ] args ) {
 
         CrunchifyTransientVariableObject crunchifyCompany = new CrunchifyTransientVariableObject ( "Crunchify.com" , 5 , 95112 ) ;
 
         // A file output stream is an output stream for writing data to a File or to a FileDescriptor.
         try ( FileOutputStream crunchifyFOS = new FileOutputStream ( "crunchify.obj" ) ;
             ObjectOutputStream crunchifyOOS = new ObjectOutputStream ( crunchifyFOS ) ) {
             crunchifyOOS . writeObject ( crunchifyCompany ) ;
             crunchifyOOS . flush ( ) ;
         } catch ( FileNotFoundException e ) {
             e . printStackTrace ( ) ;
         } catch ( IOException e ) {
             e . printStackTrace ( ) ;
         }
 
         CrunchifyTransientVariableObject crunchifyResult = null ;
 
         // A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment.
         try ( FileInputStream crunchifyFOS = new FileInputStream ( "crunchify.obj" ) ;
             ObjectInputStream crunchifyOIS = new ObjectInputStream ( crunchifyFOS ) ) {
             crunchifyResult = ( CrunchifyTransientVariableObject ) crunchifyOIS . readObject ( ) ;
         } catch ( FileNotFoundException e ) {
             e . printStackTrace ( ) ;
         } catch ( IOException e ) {
             e . printStackTrace ( ) ;
         } catch ( ClassNotFoundException e ) {
             e . printStackTrace ( ) ;
         }
 
         System . out . println ( "Company Name: " + crunchifyResult . getName ( ) ) ;
         System . out . println ( "Number of Employee: " + crunchifyResult . getEmployeeCount ( ) ) ;
         System . out . println ( "Zip code: " + crunchifyResult . getZip ( ) ) ;
     }
 
}

Jalankan program:

Dengan kata kunci sementara:

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/ Library / Java / JavaVirtualMachines / jdk - 14.0.2.jdk / Contents / Home / bin / java - javaagent
Company Name : Crunchify . com
Number of Employee : 5
Zip code : 0
 
Process finished with exit code 0

Tanpa kata kunci sementara:

Hapus kata kunci sementara di program di atas dan jalankan kembali program lagi.

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/ Library / Java / JavaVirtualMachines / jdk - 14.0.2.jdk / Contents / Home / bin / java - javaagent
Company Name : Crunchify . com
Number of Employee : 5
Zip code : 95112
 
Process finished with exit code 0

Seperti yang Anda lihat di atas, sekarang kami dapat melihat kode pos 95112.

Tolong beri tahu saya jika Anda melihat masalah membuat serial objek dan variabel sementara.