What is the Java equivalent of PHP var dump

Question

PHP has a var dump   function which outputs the internal contents of an object  showing an object s type and content   For example   class Person     private  firstName    private  lastName     public function   construct  firstName   lastName         this- gt firstName    firstName       this- gt lastName    lastName          person   new Person  Jon    Smith    var dump  person     will output   object Person  1  2        firstName private    gt    string 3   Jon      lastName private    gt    string 5   Smith      What is the equivalent in Java that will do the same

User · Answer

I think that the best way to do It  is using google-gson  A Java library to convert JSON to Java objects and vice-versa   Download It  add  jar  file to your project   HashMap lt String  String gt  map   new HashMap lt String  String gt      map put  key 1    Baku    map put  key 2    Azerbaijan    map put  key 3    Ali Mamedov     Gson gson   new Gson     System out println gson toJson map      Output     key 3   Ali Mamedov   key 2   Azerbaijan   key 1   Baku     You can convert any object  arrays  lists and etc  to JSON  I think  that It is the best analog of PHP s var dump

User · Answer

In my experience  var dump is typically used for debugging PHP in place of a step-though debugger  In Java  you can of course use your IDE s debugger to see a visual representation of an object s contents

User · Answer

I found this method to dump object  try this String dump Object object

User · Answer

I like to use GSON because it s often already a dependency of the type of projects I m working on   public static String getDump Object o        return new GsonBuilder   setPrettyPrinting   create   toJson o       Or substitute GSON for any other JSON library you use

User · Answer

You XML serialization  and you should get a very neat representation even of deeply nested objects

User · Answer

In my experience  var dump is typically used for debugging PHP in place of a step-though debugger  In Java  you can of course use your IDE s debugger to see a visual representation of an object s contents

User · Answer

It is not quite as baked-in in Java  so you don t get this for free   It is done with convention rather than language constructs   In all data transfer classes  and maybe even in all classes you write      you should implement a sensible toString method   So here you need to override toString   in your Person class and return the desired state   There are utilities available that help with writing a good toString method  or most IDEs have an automatic toString   writing shortcut

User · Answer

The apache commons lang package provides such a class which can be used to build up a default toString   method using reflection to get the values of fields  Just have a look at this

User · Answer

In my experience  var dump is typically used for debugging PHP in place of a step-though debugger  In Java  you can of course use your IDE s debugger to see a visual representation of an object s contents

User · Answer

Your alternatives are to override the toString   method of your object to output its contents in a way that you like  or to use reflection to inspect the object  in a way similar to what debuggers do    The advantage of using reflection is that you won t need to modify your individual objects to be  analysable   but there is added complexity and if you need nested object support you ll have to write that   This code will list the fields and their values for an Object  o   Field   fields   o getClass   getDeclaredFields    for  int i 0  i lt fields length  i          System out println fields i  getName       -     fields i  get o

User · Answer

It is not quite as baked-in in Java  so you don t get this for free   It is done with convention rather than language constructs   In all data transfer classes  and maybe even in all classes you write      you should implement a sensible toString method   So here you need to override toString   in your Person class and return the desired state   There are utilities available that help with writing a good toString method  or most IDEs have an automatic toString   writing shortcut

User · Answer

I think that the best way to do It  is using google-gson  A Java library to convert JSON to Java objects and vice-versa   Download It  add  jar  file to your project   HashMap lt String  String gt  map   new HashMap lt String  String gt      map put  key 1    Baku    map put  key 2    Azerbaijan    map put  key 3    Ali Mamedov     Gson gson   new Gson     System out println gson toJson map      Output     key 3   Ali Mamedov   key 2   Azerbaijan   key 1   Baku     You can convert any object  arrays  lists and etc  to JSON  I think  that It is the best analog of PHP s var dump

User · Answer

The apache commons lang package provides such a class which can be used to build up a default toString   method using reflection to get the values of fields  Just have a look at this

User · Answer

I found this method to dump object  try this String dump Object object

User · Answer

I use Jestr with reasonable results

User · Answer

I think something similar you could do is to create a simple method which prints the object you want to see  Something like this   public static void dd Object obj    System out println obj       It s not the same like var dump    but you can get an general idea of it  without the need to go to your debugger IDE

User · Answer

Just to addup on the Field solution  the setAccessible  so that you can access private variable of an object  public static void dd Object obj  throws IllegalArgumentException  IllegalAccessException       Field   fields   obj getClass   getDeclaredFields        for  int i 0  i lt fields length  i                  fields i  setAccessible true           System out println fields i  getName      quot  -  quot    fields i  get obj

User · Answer

In my experience  var dump is typically used for debugging PHP in place of a step-though debugger  In Java  you can of course use your IDE s debugger to see a visual representation of an object s contents

User · Answer

I like to use GSON because it s often already a dependency of the type of projects I m working on   public static String getDump Object o        return new GsonBuilder   setPrettyPrinting   create   toJson o       Or substitute GSON for any other JSON library you use

User · Answer

Your alternatives are to override the toString   method of your object to output its contents in a way that you like  or to use reflection to inspect the object  in a way similar to what debuggers do    The advantage of using reflection is that you won t need to modify your individual objects to be  analysable   but there is added complexity and if you need nested object support you ll have to write that   This code will list the fields and their values for an Object  o   Field   fields   o getClass   getDeclaredFields    for  int i 0  i lt fields length  i          System out println fields i  getName       -     fields i  get o

User · Answer

Your alternatives are to override the toString   method of your object to output its contents in a way that you like  or to use reflection to inspect the object  in a way similar to what debuggers do    The advantage of using reflection is that you won t need to modify your individual objects to be  analysable   but there is added complexity and if you need nested object support you ll have to write that   This code will list the fields and their values for an Object  o   Field   fields   o getClass   getDeclaredFields    for  int i 0  i lt fields length  i          System out println fields i  getName       -     fields i  get o

User · Answer

Your alternatives are to override the toString   method of your object to output its contents in a way that you like  or to use reflection to inspect the object  in a way similar to what debuggers do    The advantage of using reflection is that you won t need to modify your individual objects to be  analysable   but there is added complexity and if you need nested object support you ll have to write that   This code will list the fields and their values for an Object  o   Field   fields   o getClass   getDeclaredFields    for  int i 0  i lt fields length  i          System out println fields i  getName       -     fields i  get o

User · Answer

I think something similar you could do is to create a simple method which prints the object you want to see  Something like this   public static void dd Object obj    System out println obj       It s not the same like var dump    but you can get an general idea of it  without the need to go to your debugger IDE

User · Answer

I use Jestr with reasonable results

User · Answer

The apache commons lang package provides such a class which can be used to build up a default toString   method using reflection to get the values of fields  Just have a look at this

User · Answer

It is not quite as baked-in in Java  so you don t get this for free   It is done with convention rather than language constructs   In all data transfer classes  and maybe even in all classes you write      you should implement a sensible toString method   So here you need to override toString   in your Person class and return the desired state   There are utilities available that help with writing a good toString method  or most IDEs have an automatic toString   writing shortcut

User · Answer

You XML serialization  and you should get a very neat representation even of deeply nested objects

User · Answer

I use Jestr with reasonable results

User · Answer

Just to addup on the Field solution  the setAccessible  so that you can access private variable of an object  public static void dd Object obj  throws IllegalArgumentException  IllegalAccessException       Field   fields   obj getClass   getDeclaredFields        for  int i 0  i lt fields length  i                  fields i  setAccessible true           System out println fields i  getName      quot  -  quot    fields i  get obj

User · Answer

I use Jestr with reasonable results

User · Answer

The apache commons lang package provides such a class which can be used to build up a default toString   method using reflection to get the values of fields  Just have a look at this

User · Answer

It is not quite as baked-in in Java  so you don t get this for free   It is done with convention rather than language constructs   In all data transfer classes  and maybe even in all classes you write      you should implement a sensible toString method   So here you need to override toString   in your Person class and return the desired state   There are utilities available that help with writing a good toString method  or most IDEs have an automatic toString   writing shortcut

[java] What is the Java equivalent of PHP var_dump?

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