How do i change a variable of another class?

Question

I have a variable in the class "MainActivity" with the name modeNr, it is protected so it should be accessible from within the package, however whenever I try to alter it from a class in the same package it gives the error: "Non-static field 'modeNr' cannot be referenced from a static context". I use the following line to alter the variable:

MainActivity.modeNr = 1;

Any ideas on what the problem is and how to correct it?

The answers in comments and those below will help achieve what you want. But the approach is totally impractical. What are you trying to achieve? I'm sure there is a better way to do whatever it is. — Viral Patel, May 01 '15 at 14:43

score 0 · Accepted Answer · answered May 01 '15 at 14:39

you are trying to change non-static member from static function. you need to make that varible static as well or need to create object of that class. lets suppose,

class Test {
 int node = 0;
 static int node1 =10; 

}

class changeNode {

public static void changeNode(){
 new Test().node = somevalue;
//or you need to make node static and change like this
Test.node1 = some value 

}
}

score 0 · Answer 2 · answered May 01 '15 at 14:41

0

Sorry I can't comment.

Your modeNr is not static variable. You need to define it like:

protected static String modeNr="ddddd"

since you modify it by MainActivity.modeNr, in this way the variable must be a static variable.

answered May 01 '15 at 14:41

Surely

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score 0 · Answer 3 · answered May 01 '15 at 14:47

0

To get rid of that error you need to define your variable as static.

static String modeNr="soemthing"

To access a static variable either access it via static member or via an object.

answered May 01 '15 at 14:47

underdog

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score 0 · Answer 4 · answered May 01 '15 at 14:47

0

Just make modeNr variable static.

And I think the log Non-static field 'modeNr' cannot be referenced from a static context is explaining everything.

answered May 01 '15 at 14:47

RediOne1

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How do i change a variable of another class?

4 Answers4