java - Good way to implement a child class -

so have 10-15 classes (this grow larger number in time) , have similar variables within them:

temp conditions humidity load 

..and stuff that. i'm looking implement parent class (abstract) better manage since runnable.

there's part call constructor each of them , it's... bad.

 public threadhandler(nh.nhandler nsh, int threadnum){     this.threadnum=threadnum;     this.nsh = nsh; }  public threadhandler(opa.opahandler sgesh, int threadnum){     this.threadnum=threadnum;     this.opash = opash; }  public threadhandler(sge.sgehandler sgesh, int threadnum){     this.threadnum=threadnum;     this.sgesh = sgesh; } 

..... , on 15

how implement parent class do

public threadhandler(objecttype name, int threadnum){     //do stuff } 

thanks help.

you need create interface, say, ihandler common methods , handlers should implement interface

public interface ihandler {       .... declare public methods      } 

public nhandler implements ihandler  {        .... implement methods declared in ihandler..     }

can have following in threadhandler

public threadhandler(ihandler  handler, int threadnum){         .... call methods     }