what is the best way to get other class of object reference??

-2

Sorry, i can't give better title.I have two class A and B.A class is singleton class.it always gives same object to whoever want it.Here B class always want that A object refenence. check follow code

class B

 private A a;
 B()
 this.a=A.getAObject();
 
 public void process(String args) 
 
 a.sendData();//line 1
 (or)
 A.getAObject().sendData();//line 2

which is best way as mentioned above line 1 or line 2 as performance wise like that??

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

1

line 2. And remove the this.a=A.getAObject(); as class A is singleton object. You always need to access A's object by calling static method!

– Zico
Nov 13 '18 at 7:09

1

This really doesn't make a difference, except perhaps for unit tests or readability.

– ernest_k
Nov 13 '18 at 7:09

add a comment |

-2

Sorry, i can't give better title.I have two class A and B.A class is singleton class.it always gives same object to whoever want it.Here B class always want that A object refenence. check follow code

class B

 private A a;
 B()
 this.a=A.getAObject();
 
 public void process(String args) 
 
 a.sendData();//line 1
 (or)
 A.getAObject().sendData();//line 2

which is best way as mentioned above line 1 or line 2 as performance wise like that??

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

1

line 2. And remove the this.a=A.getAObject(); as class A is singleton object. You always need to access A's object by calling static method!

– Zico
Nov 13 '18 at 7:09

1

This really doesn't make a difference, except perhaps for unit tests or readability.

– ernest_k
Nov 13 '18 at 7:09

add a comment |

-2

Sorry, i can't give better title.I have two class A and B.A class is singleton class.it always gives same object to whoever want it.Here B class always want that A object refenence. check follow code

class B

 private A a;
 B()
 this.a=A.getAObject();
 
 public void process(String args) 
 
 a.sendData();//line 1
 (or)
 A.getAObject().sendData();//line 2

which is best way as mentioned above line 1 or line 2 as performance wise like that??

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

Sorry, i can't give better title.I have two class A and B.A class is singleton class.it always gives same object to whoever want it.Here B class always want that A object refenence. check follow code

class B

 private A a;
 B()
 this.a=A.getAObject();
 
 public void process(String args) 
 
 a.sendData();//line 1
 (or)
 A.getAObject().sendData();//line 2

which is best way as mentioned above line 1 or line 2 as performance wise like that??

java

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

asked Nov 13 '18 at 7:05

jagadeesh kalaiyarasan

157

1

line 2. And remove the this.a=A.getAObject(); as class A is singleton object. You always need to access A's object by calling static method!

– Zico
Nov 13 '18 at 7:09

1

This really doesn't make a difference, except perhaps for unit tests or readability.

– ernest_k
Nov 13 '18 at 7:09

add a comment |

1

line 2. And remove the this.a=A.getAObject(); as class A is singleton object. You always need to access A's object by calling static method!

– Zico
Nov 13 '18 at 7:09

1

This really doesn't make a difference, except perhaps for unit tests or readability.

– ernest_k
Nov 13 '18 at 7:09

line 2. And remove the this.a=A.getAObject(); as class A is singleton object. You always need to access A's object by calling static method!

– Zico
Nov 13 '18 at 7:09

This really doesn't make a difference, except perhaps for unit tests or readability.

– ernest_k
Nov 13 '18 at 7:09

add a comment |

2 Answers
2

active

oldest

votes

You can reference of one class to another class by making reference of the other class

In your code you do something like this :

 class B 
 private A a;
 B(A a)
 this.a=a; //refernce of a
 
 public void display()
 a.getA(); //display method of a 
 

 
 class A
 public void getA()
 ....

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

3

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

add a comment |

In many cases the differences will be insignificant.

But there would be scenarios like where you have to create a lot of instances of B. So in those scenarios there would be a performance impact since introducing a filed to that class means taking more memory when creating a instance.

If it is not a scenario like that, I think its better to assign it to a variable, since it will improve the readability of the code if you use that instance often in the class.

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

1

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

|
show 4 more comments

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

You can reference of one class to another class by making reference of the other class

In your code you do something like this :

 class B 
 private A a;
 B(A a)
 this.a=a; //refernce of a
 
 public void display()
 a.getA(); //display method of a 
 

 
 class A
 public void getA()
 ....

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

3

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

add a comment |

You can reference of one class to another class by making reference of the other class

In your code you do something like this :

 class B 
 private A a;
 B(A a)
 this.a=a; //refernce of a
 
 public void display()
 a.getA(); //display method of a 
 

 
 class A
 public void getA()
 ....

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

3

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

add a comment |

You can reference of one class to another class by making reference of the other class

In your code you do something like this :

 class B 
 private A a;
 B(A a)
 this.a=a; //refernce of a
 
 public void display()
 a.getA(); //display method of a 
 

 
 class A
 public void getA()
 ....

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

You can reference of one class to another class by making reference of the other class

In your code you do something like this :

 class B 
 private A a;
 B(A a)
 this.a=a; //refernce of a
 
 public void display()
 a.getA(); //display method of a 
 

 
 class A
 public void getA()
 ....

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

edited Nov 13 '18 at 7:22

answered Nov 13 '18 at 7:17

Swati

266

answered Nov 13 '18 at 7:17

Swati

266

answered Nov 13 '18 at 7:17

Swati

266

3

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

add a comment |

3

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

This doesn't look like it's answering the question asked. The OP wants to get at the singleton A from B, not vice versa.

– Jon Skeet
Nov 13 '18 at 7:20

add a comment |

In many cases the differences will be insignificant.

If it is not a scenario like that, I think its better to assign it to a variable, since it will improve the readability of the code if you use that instance often in the class.

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

1

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

|
show 4 more comments

In many cases the differences will be insignificant.

If it is not a scenario like that, I think its better to assign it to a variable, since it will improve the readability of the code if you use that instance often in the class.

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

1

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

|
show 4 more comments

In many cases the differences will be insignificant.

If it is not a scenario like that, I think its better to assign it to a variable, since it will improve the readability of the code if you use that instance often in the class.

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

In many cases the differences will be insignificant.

If it is not a scenario like that, I think its better to assign it to a variable, since it will improve the readability of the code if you use that instance often in the class.

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

edited Nov 13 '18 at 9:40

answered Nov 13 '18 at 7:11

Sand

1,425319

answered Nov 13 '18 at 7:11

Sand

1,425319

answered Nov 13 '18 at 7:11

Sand

1,425319

1

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

|
show 4 more comments

1

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

No, introducing a field in class B means that every instance will take more memory. If there are lots of instances of B, that could have a very serious impact. There's really no point in having a copy of the same value in every object of type B.

– Jon Skeet
Nov 13 '18 at 7:19

@JonSkeet He is asking about performance wise. And you are answering about a specific scenario where a lot of Objects of B can created. I was answering generally :)

– Sand
Nov 13 '18 at 7:30

Memory is part of performance - even in terms of execution time, as the more memory that is taken, the less effective the memory caches will be. I fail to see how "if you have to use the methods and variables in A class a lot" is general but "if there are lots of instances of B" is specific. Besides, making a general claim for something that fails to include a specific but entirely reasonable scenario isn't great either. The performance of the two options simply isn't the same.

– Jon Skeet
Nov 13 '18 at 8:17

"Both will be same is the general" part. and the difference between the part you highlighted in mine and yours is "if". performance of the two options simply isn't the same for your scenario. True

– Sand
Nov 13 '18 at 8:22

@JonSkeet Since I can't edit the last comment, You are saying No, based on your scenario and I'm not saying "Both will be same" based on my scenario you have highlighted. I have mentioned my scenario to just give an extra info about the readability :)

– Sand
Nov 13 '18 at 8:46

|
show 4 more comments

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