Factory Methods - III

7 September 2008

Implementation that prints messages on command prompt is presented in this post.

public class SystemTrace implements Trace {
      private boolean debug;
      public void setDebug( boolean debug ) {
            this.debug = debug;
      }
      public void debug( String message ) {
            if( debug ) {  // only print if debug is true
                  System.out.println( "DEBUG: " + message );
            }
      }
      public void error( String message ) {
            // always print out errors
            System.out.println( "ERROR: " + message );
      }
}

To use SystemTrace, we will do the following:

…
SystemTrace log = new SystemTrace();
…
log.debug( "entering log" );
…

This approach has drawbacks discussed in next post.

Continued …

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