Trying use the existing Logger object, but getting <identifier expected> error?

Question

Java logging API is used in my project. They are using logger like in constructor of a class A, for example:

public A(Context context) { 
  log_ = (Logger) context.getAttribute(LOGGER);
}

I have to implement it for a class which doesnot have a constructor... I tried to make a object of that class like in:

Class B { 
  B b; 
}

and tried to use logger like:

log_ = (Logger) b.getAttribute(LOGGER);

But I keep getting the error <identifier expected> at this line? What is fault here? Thanks in advance.

If you told us what error you get (compiler warning, stack trace) we might help you. — Gyro Gearless
– Gyro Gearless, Commented Mar 28, 2013 at 10:32
'They' are getting the Logger from a context make sure you do it the same way. Make sure you declare your fields correctly. Make sure you declare all the required fields. And for the love of Java show us more concrete code and the stacktrace :) — Lenymm
– Lenymm, Commented Mar 28, 2013 at 10:39
You cannot put arbitrary statements, such as an assignment statement, inside the class body, outside a method or constructor. Add a constructor to your class B and put the assignment in there. — Jesper
– Jesper, Commented Mar 28, 2013 at 10:40
I can't understand the relationship between A and B. Can you explain it? — Duncan Jones
– Duncan Jones, Commented Mar 28, 2013 at 10:40

Raffaele · Accepted Answer · 2013-03-28 10:39:43Z

1

You can't put arbitrary statements directly in a class definition (in fact it's a definition). You can initialize your member fields

In a constructor (every class has at least a constructor, if you don't explicitely code one, the compiler will add a default constructor which takes no arguments)
Directly at definition time
Lazily in a method like getLogger()

All three options illustrated in (valid) Java code:

class B {

  Context ctx = Context.getDefault();
  Logger log = ctx.getLogger();

  B(Context ctx) {
    log = ctx.getLogger();
  }

  Logger logger() {
    return ctx.getLogger();
  }
}

answered Mar 28, 2013 at 10:39

Raffaele

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1 Comment

Rajesh Kumar Over a year ago

Are you suggesting to write a constructor public B(Context context){log_ = (Logger) context.getAttribute(LOGGER); } But still it's not working? Or i understand it wrong... Kindly help

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