unexpected end of declaration for class variable

Question

I am facing weird error: unexpected end of declaration. And I am very sure that there is no typo. Please help.

package test.anyname;
import android.app.*;
import android.os.*;

public class MainActivity extends Activity {
   boolean ty= true;
   ty= false;       // Error occurred at this line
   @Override
   protected void onCreate(Bundle savedInstanceState){
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
   }
}

If you want ty to be "false" why should you initialize with "true" or you can change value of ty inside onCreate() to "false" — Vivek Barai, Dec 14 '17 at 10:54
@VívêkBåräì I am new to this and it is my first script. But from what i have learnt this should be allowed, right? — D5fgj, Dec 14 '17 at 10:59
@D5fgj the fact there is a compiler error is a clear indication that this is not allowed. — Andy Turner, Dec 14 '17 at 11:03
According to java's algorithm you cannot assign value to variable out side method. — Vivek Barai, Dec 14 '17 at 11:04

score 2 · Answer 1 · answered Dec 14 '17 at 11:18

2

You can initialize a variable only once and you can't change this variable once again outside of some method. Then, you should do this in a method.

package test.anyname;
import android.app.*;
import android.os.*;

public class MainActivity extends Activity {
   boolean ty = false; // you can initialize only once

   @Override
   protected void onCreate(Bundle savedInstanceState){
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
   }

   void changeTy() {
      ty = !ty;
   }
}

answered Dec 14 '17 at 11:18

Görkem Taşçı

21
3

A couple of points (and I'm mostly nitpicking): 1) you can actually initialize a variable multiple times: `boolean ty = ty = ty = false;` is (perhaps surprisingly) legal; 2) you can change the variable in an instance initializer (e.g. `boolean ty = false; {ty = true;}`), which isn't a method. – Andy Turner Dec 15 '17 at 08:34

Andy Turner · Accepted Answer · 2017-12-14T11:12:31.223

1

The only things which you can write directly inside a class body are:

Field declarations (e.g. boolean ty= true;)
Method declarations (e.g. @Override protected void onCreate(Bundle savedInstanceState) { ... })
Constructors
Declarations of nested interfaces and classes
Static and instance initializers

ty = false; is an assignment, which is none of these, so it is not allowed.

edited Dec 14 '17 at 11:12

answered Dec 14 '17 at 11:09

Andy Turner

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How about something like `Cursor cursor = cursorLoader.loadInBackground();` ? Because it can be run without error – D5fgj Dec 14 '17 at 11:12
That is a field declaration, with an initializer. – Andy Turner Dec 14 '17 at 11:12

unexpected end of declaration for class variable

2 Answers2