How can I use method from instance class with new class name?

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Hello, I'm new to Flutter/Dart. When I take an instance of a class and try to use a method in it, I getting below error.How can i use method from instance class with new class name? Thanks.

"The instance member 'newData' can't be accessed in an initializer.
Try replacing the reference to the instance member with a different expression"

My example below:

Dart

class Data {
    String read() {
        return "";
    }
}

class Data2 {
    var newData= Data(); // I took instance from the Data class.
    String readData = newData.read(); //Here it gives the above error. I want to use it as newData.read(), not Data.read().
}

What I have tried:

I dont have any idea? I can use as Data.read() but i think this is not right way, if i use instance with parent name in a new class.

Posted 14-Feb-24 10:08am

gacar

Updated 14-Feb-24 10:56am

v5

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gacar · Accepted Answer · 2024-02-14T11:05:00

I found solution on flutter/dart discord channel.
I should have marked the method of the new class as "late".
I marked late then working now.

Dart

class Data {
    String read() {
        return "";
    }
}

class Data2 {
    var newData= Data(); // I took instance from the Data class.
   late String readData = newData.read(); // I can using as newData.read() now
}