Java Logging With Abstract Classes

Question

I am working on a project, and am currently working on implementing some logging with log4j and I was curious about how I should go about implementing the logs. The two implemen

Answer 1

The same can be achieved by playing with constructors. Add logger at the Base class level and set it from every Derived class using super(). There is the code :

public abstract class AbstractFoo {

    protected Log log;  // base abstract class has a Log object.

    public AbstractFoo(Log logger) {   // parameterized constructor for logger, to be used by the derived class.
        this.log = logger;
    }

    public doSomething() {        // common method for all the derived classes.
      log.info("log something");
    }
    // rest of business logic.
}

public class Foo extends AbstractFoo {

    public Foo(){
        super(LogFactory.getLog(AbstractFoo.class));
    }

    public void someMethod() {
        log.info("Using own log");     // this uses its own logger.
    }
}