Receive variables from other classes

Question

Receive variables from other classes

Asked 9 years, 2 months ago

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1

A class that contains variables and their values, and needs some simple way to feed the other class with these variables.

For example, I have a class with the variable String urlPage = 'www.abc.com'. That one urlPage can change sometimes, but I didn’t want to change in all classes that use this value, I wanted to change only in the class where it is defined. So, in the other classes, in their proper methods, I would only inform the variable, and they would already understand that its value is 'www.abc.com'.

I made it work with get and set, but I wanted to know if there is a simpler way, because it would not be just a variable, it would be several, and I think it would be a job to make a get and set for each one.

I did the following:

public class UsedLinks { 

private String homepagelink = "abc.com.br"; 

public void setHomepage( String homepage)
{ this.homepagelink= homepage; } 

public String getHomepage()

{ return this.homepagelink; } }

Already in the other class, I just called

Usedlinks link = new Usedlinks(); 
link.gethomepage();

Only I found a lot of work being that I will use not only the URL as variable.

Show what you did. But at first this is right. Unless you prefer to make the variable public access. Not recommended, but can be used.

– Maniero

2015/10/15 at 17:22
Put the full code is easier to answer. Take the opportunity to familiarize yourself with the site on tour

– rray

2015/10/15 at 17:23
Could you explain to me how to call the variable with public access? No problem for now. @bigown:

– Luís Gustavo Vieira

2015/10/15 at 17:31
1

@Luisa Gustavovieira you only need to put the access modifier public when declaring the variable.

– Jéf Bueno

2015/10/15 at 17:32
The IDE gets and sets for you, which Voce IDE uses?

– David Schrammel

2015/10/15 at 17:33
I edited the post because I couldn’t comment on the well formatted @rray code

– Luís Gustavo Vieira

2015/10/15 at 17:33
Eclipse @Davidschrammel

– Luís Gustavo Vieira

2015/10/15 at 17:34
1

Welcome to the Java. =]

– RafaelTSCS

2015/10/15 at 17:35
Make the eclipse generate these codes, the keyboard can do, ctrl+3 typhoon ggas mark the desired options and ok.

– rray

2015/10/15 at 17:36
Then click with the right mouse button -> Source -> Generate Getters and Setters...

– David Schrammel

2015/10/15 at 17:38
1

Dude...how have I never been told this before? Much easier. Thank you!

– Luís Gustavo Vieira

2015/10/15 at 17:42
@Luisa Gustavovieira Take a look at [tour]. You can accept an answer if it solved your problem. You can vote on every post on the site as well. Did any help you more? Need something to be improved?

– Maniero

2016/03/04 at 19:30

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2 answers

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by Maniero • **444,682** points · Answer 1 · 2015-10-15T17:35:44+00:00

To simplify you can make the attribute public, so you don’t need to create the pair of access methods:

public class UsedLinks {
    public String homepagelink = "abc.com.br";
}

Use:

Usedlinks link = new Usedlinks(); 
link.homepagelink;

I put in the Github for future reference.

There’s disadvantages in doing this and should be avoided, but it’s not wrong if you know what you’re doing. It’s not hard to do it the right way and some Ides even automate the process.

by Victor Siqueira • **638** points · Answer 2 · 2015-10-15T19:44:40+00:00

I would create the object of the class in every corner that you need to change, and create a method to change the values of those that you think need to be changed