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public class EnterExitLog {
 
    protected Logger log_;
    protected Object source_;
    protected String fn_;
 
    public EnterExitLog( Logger log, Object source, String fn )
    {
        log_ = log;
        source_ = source;
        fn_ = fn;
        LOG("ENTER " + fn_);
    }
 
    public void LOG( String data )
    {
        // special log, no level needed
        // enable/disable in diag
        log_.logInfo(source_, data);
    }
 
    @Override
    protected void finalize() throws Throwable
    {
        // perform last log
        LOG( "EXIT " + fn_);
    }
}
 

Main.java:1: error: class EnterExitLog is public, should be declared in a file named EnterExitLog.java
public class EnterExitLog {
       ^
Main.java:3: error: cannot find symbol
    protected Logger log_;
              ^
  symbol:   class Logger
  location: class EnterExitLog
Main.java:7: error: cannot find symbol
    public EnterExitLog( Logger log, Object source, String fn )
                         ^
  symbol:   class Logger
  location: class EnterExitLog
3 errors

Standard output is empty