class - Import Classes Into Java Files -


i learning develop in java , interested in creating java classes other users can import program , use. yes, know example class simple , stupid want learn concept , start making more complex classes people can import projects.

i created simple "logger" class when called logs both text console , text file readability. can call class using following commands...

logger logger = new logger(); logger.create(); logger.log("this text logged console , log.log");

see below logger class.

import java.io.bufferedwriter; import java.io.file; import java.io.filewriter; import java.text.simpledateformat; import java.util.calendar; import java.util.date;  public class logger {         filewriter fw;         bufferedwriter br;         file file = new file("log.log");         boolean fileexists = file.exists();         public void log(string message) {             try {                 fw = new filewriter(file, true);                 br = new bufferedwriter(fw);                 calendar cal = calendar.getinstance();                  int hour = cal.get(calendar.hour_of_day);                 if(hour > 12)                     hour = hour - 12;                  int minute = cal.get(calendar.minute);                 int second = cal.get(calendar.second);                 int millis = cal.get(calendar.millisecond);                  int ampm = cal.get(calendar.am_pm);                  string ampmstring;                 if(ampm == 1)                     ampmstring = "pm";                 else                     ampmstring = "am";                  string = string.format("%02d:%02d:%02d.%03d %s", hour, minute, second, millis, ampmstring);                  system.out.println(now + " - " + message);                 br.write(now + " - " + message);                  br.newline();                 br.close();             } catch (exception err) {                 system.out.println("error");             }          }         public void create() {             try {                 fw = new filewriter(file, true);                 br = new bufferedwriter(fw);                 simpledateformat sdf = new simpledateformat("mm-dd-yyyy");                 string datestring = sdf.format(new date());                 if(file.length() != 0)                     br.newline();                 system.out.println("log: " + file.getabsolutepath());                 br.write("--------------------" + datestring + "--------------------");                 br.newline();                 br.close();             } catch (exception err) {                 system.out.println("error");             }         }     }

the issue having in order use class have add every single project create , want use this. there way can add import like, mydomain.logger.*; , able access class , methods contains?

my question, what best way allow import/use logger class in simplest way? steps need take allow them this?

compile class jar file, , add jar classpath of each project. standard java approach reusing classes.


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