Difference between Object[] and Array of specific Objects in java

-6

I know this may be trivial but I could not find an answer yet.

What are the differences between and Object and an array of specific Objects, for example

class car {

    public Object someCars;

    public car someOthercars;

}

I know that car can store car Objects and Object can store any Objects. But APART from this are there any not so obvious differences?

java arrays object

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What is the difference between an Object and Car variable ?
  
  – AxelH
  Jan 2 at 14:01
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Object can contain any Objects. car can contain instances of car. As you might expect.
  
  – khelwood
  Jan 2 at 14:02
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Open a book before you ask.
  
  – Bouramas
  Jan 2 at 14:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @khelwood. So the only difference is that Object can contain any objects while car can only store car objects?
  
  – CuriousIndeed
  Jan 2 at 14:05
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What's Object Oriented Programming?
  
  – Anton Hlinisty
  Jan 2 at 14:07
  

  
  
  
  

 | 
show 1 more comment

-6

I know this may be trivial but I could not find an answer yet.

What are the differences between and Object and an array of specific Objects, for example

class car {

    public Object someCars;

    public car someOthercars;

}

I know that car can store car Objects and Object can store any Objects. But APART from this are there any not so obvious differences?

java arrays object

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What is the difference between an Object and Car variable ?
  
  – AxelH
  Jan 2 at 14:01
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Object can contain any Objects. car can contain instances of car. As you might expect.
  
  – khelwood
  Jan 2 at 14:02
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Open a book before you ask.
  
  – Bouramas
  Jan 2 at 14:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @khelwood. So the only difference is that Object can contain any objects while car can only store car objects?
  
  – CuriousIndeed
  Jan 2 at 14:05
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What's Object Oriented Programming?
  
  – Anton Hlinisty
  Jan 2 at 14:07
  

  
  
  
  

 | 
show 1 more comment

-6

-6

-6

I know this may be trivial but I could not find an answer yet.

What are the differences between and Object and an array of specific Objects, for example

class car {

    public Object someCars;

    public car someOthercars;

}

I know that car can store car Objects and Object can store any Objects. But APART from this are there any not so obvious differences?

java arrays object

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

I know this may be trivial but I could not find an answer yet.

What are the differences between and Object and an array of specific Objects, for example

class car {

    public Object someCars;

    public car someOthercars;

}

I know that car can store car Objects and Object can store any Objects. But APART from this are there any not so obvious differences?

java arrays object

java arrays object

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

share|improve this question

share|improve this question

edited Jan 2 at 14:22

CuriousIndeed

edited Jan 2 at 14:22

CuriousIndeed

edited Jan 2 at 14:22

CuriousIndeed

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

asked Jan 2 at 14:00

CuriousIndeedCuriousIndeed

986

986

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What is the difference between an Object and Car variable ?
  
  – AxelH
  Jan 2 at 14:01
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Object can contain any Objects. car can contain instances of car. As you might expect.
  
  – khelwood
  Jan 2 at 14:02
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Open a book before you ask.
  
  – Bouramas
  Jan 2 at 14:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @khelwood. So the only difference is that Object can contain any objects while car can only store car objects?
  
  – CuriousIndeed
  Jan 2 at 14:05
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What's Object Oriented Programming?
  
  – Anton Hlinisty
  Jan 2 at 14:07
  

  
  
  
  

 | 
show 1 more comment

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  What is the difference between an Object and Car variable ?
  
  – AxelH
  Jan 2 at 14:01
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Object can contain any Objects. car can contain instances of car. As you might expect.
  
  – khelwood
  Jan 2 at 14:02
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Open a book before you ask.
  
  – Bouramas
  Jan 2 at 14:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @khelwood. So the only difference is that Object can contain any objects while car can only store car objects?
  
  – CuriousIndeed
  Jan 2 at 14:05
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Possible duplicate of What's Object Oriented Programming?
  
  – Anton Hlinisty
  Jan 2 at 14:07
  

  
  
  
  

2

2

What is the difference between an Object and Car variable ?

– AxelH
Jan 2 at 14:01

What is the difference between an Object and Car variable ?

– AxelH
Jan 2 at 14:01

Object can contain any Objects. car can contain instances of car. As you might expect.

– khelwood
Jan 2 at 14:02

Object can contain any Objects. car can contain instances of car. As you might expect.

– khelwood
Jan 2 at 14:02

Open a book before you ask.

– Bouramas
Jan 2 at 14:03

Open a book before you ask.

– Bouramas
Jan 2 at 14:03

@khelwood. So the only difference is that Object can contain any objects while car can only store car objects?

– CuriousIndeed
Jan 2 at 14:05

@khelwood. So the only difference is that Object can contain any objects while car can only store car objects?

– CuriousIndeed
Jan 2 at 14:05

1

1

Possible duplicate of What's Object Oriented Programming?

– Anton Hlinisty
Jan 2 at 14:07

Possible duplicate of What's Object Oriented Programming?

– Anton Hlinisty
Jan 2 at 14:07

 | 
show 1 more comment

2 Answers
2

active

oldest

votes

4

Car can contain only Car instances, or sub-classes of Car instances.
If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car.

Object can contain any Object instances, or any subclass of Object (every class in Java is a subclass Object, even if it is not explicitly stated with an extends keyword in a custom class), so any instance in java can be populated in the Object array.

share|improve this answer

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

add a comment | 

1

Answers to your questions are given here:

1. 
   The Java™ Tutorials. Classes


2. The Java™ Tutorials. Object-Oriented Programming Concepts

UPD

Car class inherits from Object. An array of Cars is narrower than an array of Objects. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.

share|improve this answer

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't see any reference to Object Arrays within your link
  
  – CuriousIndeed
  Jan 2 at 14:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.
  
  – Anton Hlinisty
  Jan 2 at 14:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
  
  – BoarGules
  Jan 2 at 14:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @BoarGules added textual explanation
  
  – Anton Hlinisty
  Jan 2 at 14:36
  

  
  
  
  

add a comment | 

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2 Answers
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2 Answers
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4

Car can contain only Car instances, or sub-classes of Car instances.
If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car.

Object can contain any Object instances, or any subclass of Object (every class in Java is a subclass Object, even if it is not explicitly stated with an extends keyword in a custom class), so any instance in java can be populated in the Object array.

share|improve this answer

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

add a comment | 

4

Car can contain only Car instances, or sub-classes of Car instances.
If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car.

Object can contain any Object instances, or any subclass of Object (every class in Java is a subclass Object, even if it is not explicitly stated with an extends keyword in a custom class), so any instance in java can be populated in the Object array.

share|improve this answer

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

add a comment | 

4

4

4

Car can contain only Car instances, or sub-classes of Car instances.
If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car.

Object can contain any Object instances, or any subclass of Object (every class in Java is a subclass Object, even if it is not explicitly stated with an extends keyword in a custom class), so any instance in java can be populated in the Object array.

share|improve this answer

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

Car can contain only Car instances, or sub-classes of Car instances.
If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car.

Object can contain any Object instances, or any subclass of Object (every class in Java is a subclass Object, even if it is not explicitly stated with an extends keyword in a custom class), so any instance in java can be populated in the Object array.

share|improve this answer

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

share|improve this answer

share|improve this answer

edited Jan 2 at 14:26

edited Jan 2 at 14:26

edited Jan 2 at 14:26

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

answered Jan 2 at 14:09

Daniel B.Daniel B.

1,2991112

1,2991112

add a comment | 

add a comment | 

1

Answers to your questions are given here:

1. 
   The Java™ Tutorials. Classes


2. The Java™ Tutorials. Object-Oriented Programming Concepts

UPD

Car class inherits from Object. An array of Cars is narrower than an array of Objects. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.

share|improve this answer

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't see any reference to Object Arrays within your link
  
  – CuriousIndeed
  Jan 2 at 14:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.
  
  – Anton Hlinisty
  Jan 2 at 14:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
  
  – BoarGules
  Jan 2 at 14:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @BoarGules added textual explanation
  
  – Anton Hlinisty
  Jan 2 at 14:36
  

  
  
  
  

add a comment | 

1

Answers to your questions are given here:

1. 
   The Java™ Tutorials. Classes


2. The Java™ Tutorials. Object-Oriented Programming Concepts

UPD

Car class inherits from Object. An array of Cars is narrower than an array of Objects. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.

share|improve this answer

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't see any reference to Object Arrays within your link
  
  – CuriousIndeed
  Jan 2 at 14:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.
  
  – Anton Hlinisty
  Jan 2 at 14:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
  
  – BoarGules
  Jan 2 at 14:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @BoarGules added textual explanation
  
  – Anton Hlinisty
  Jan 2 at 14:36
  

  
  
  
  

add a comment | 

1

1

1

Answers to your questions are given here:

1. 
   The Java™ Tutorials. Classes


2. The Java™ Tutorials. Object-Oriented Programming Concepts

UPD

Car class inherits from Object. An array of Cars is narrower than an array of Objects. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.

share|improve this answer

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

Answers to your questions are given here:

1. 
   The Java™ Tutorials. Classes


2. The Java™ Tutorials. Object-Oriented Programming Concepts

UPD

Car class inherits from Object. An array of Cars is narrower than an array of Objects. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.

share|improve this answer

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

share|improve this answer

share|improve this answer

edited Jan 2 at 14:36

edited Jan 2 at 14:36

edited Jan 2 at 14:36

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

answered Jan 2 at 14:08

Anton HlinistyAnton Hlinisty

98611324

98611324

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't see any reference to Object Arrays within your link
  
  – CuriousIndeed
  Jan 2 at 14:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.
  
  – Anton Hlinisty
  Jan 2 at 14:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
  
  – BoarGules
  Jan 2 at 14:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @BoarGules added textual explanation
  
  – Anton Hlinisty
  Jan 2 at 14:36
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Don't see any reference to Object Arrays within your link
  
  – CuriousIndeed
  Jan 2 at 14:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.
  
  – Anton Hlinisty
  Jan 2 at 14:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
  
  – BoarGules
  Jan 2 at 14:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @BoarGules added textual explanation
  
  – Anton Hlinisty
  Jan 2 at 14:36
  

  
  
  
  

Don't see any reference to Object Arrays within your link

– CuriousIndeed
Jan 2 at 14:14

Don't see any reference to Object Arrays within your link

– CuriousIndeed
Jan 2 at 14:14

1

1

@CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.

– Anton Hlinisty
Jan 2 at 14:22

@CuriousIndeed, see the What Is Inheritance? at the second link. Consider that Car implicitly inherits from Object.

– Anton Hlinisty
Jan 2 at 14:22

2

2

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review

– BoarGules
Jan 2 at 14:28

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review

– BoarGules
Jan 2 at 14:28

@BoarGules added textual explanation

– Anton Hlinisty
Jan 2 at 14:36

@BoarGules added textual explanation

– Anton Hlinisty
Jan 2 at 14:36

add a comment | 

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