java方法返回值返回给谁,java有返回值的方法

yjypalign=' center ' yjy/pyjypsupposethefollowingsimplifiedexample.letbrepresentaclassprocessingsomerasterdata 3360 yjy/leta yjy/p yjypprivate Runnable f； yjy/pyjyppublicb(Booleanc_，Runnable f_ ) { c=c_； f=f_； } yjy/pyjyppublicbufferedimageprocess () yjy/pyjyp//someoperationsyjy/pyjyp粗犷保温杯output=null； yjy/pyjypif(c ) output=newbufferedimage (100，100，BufferedImage.TYPE_INT_ARGB )； yjy/p yjypreturn output； yjy/pyjyp } yjy/pyjyppublicvoidrun () { process )； } yjy/pyjyp } yjy/pyjyptheprocess (methodmaybutmaynotcreateanoutputrater.duetothecomputationalcost， theprocedurerunsinaseparatethread.yjy/pyjypletarepresentaclassinsidewhichtheprocedurewillberun.italsocontainsomepostprocessstepswaitinguntilthethereadisfinished 30 pyjyppublicclassa { yjy/pyjyppublica (} yjy/pyjyppublicvoidcompute ) {yjy/p yjypboolean c=true； yjy/pyjypbb=newb(c，new Runnable ) ({yjy/p yjyppublic void run ) ) {yjy/p yjyp//Post process，afterthethreadhasbed ？ //Get resulting raster，how？ yjy/pyjypif(img！=null } { yjy/pyjyp//performsomestepsyjy/pyjyp } yjy/pyjyp } yjy/pyjyp }； yjy/pyjypthreadt=newthread(b； yjy/p yjypt.start (； //runprocedureyjy/pyjyp } yjy/pyjyp } yjy/pyjyphowever，howtogetresultingrastercreatedusingtheprocess () method ofb’ whentheoutputimagerepresentsadatamemberofbtogetherwithyjy/pyjypb.getimage； yjy/pyjypireadapostaboutcallbacksyjy/pyjypbuthowtoimplementithere？ thanksforyourhelpandashortexample.yjy/pyjyp解决方案yjy/p yjypUse an ExecutorService、 specificallyitsubmit(callable ) methodwhichreturnsafuturewhichget (or is done ) methodscanbecalledtoretrievetheresult 33366666 py6 yjy/pyjyppublicb(Booleanc ) { this.c=c； } yjy/pyjyppublicbufferedimagecall () yjy/pyjyp//someoperationsyjy/pyjypif (！ c ) yjy/p yjypreturn null； yjy/pyjypreturnnewbufferedimage (100，100，BufferedImage.TYPE_INT_ARGB )； yjy/pyjyp } yjy/pyjyp } yjy/pyjyp//somewhere，e.g.inyoura.com pute (methodyjy/pyjypwxdylexe=executors.com) yjy/pyjypfutureres=exe.submit (b )； //willreturnimmediately.processingwillruninathreadof ' exe ' executory jy/pyjyp//.dothingsyjy/pyjyhdws.out.pexexe //willblockuntilimageisavailable (I.e.b.call ) ) returns ) yjy/pyjypyoucanusedifferentflavorsofexecutorserviceinwhichyoucanqueueprocessingswhichmay eturn aresult.thetypeofexecutoryouwanttousedependsonthetypeofprocessingandorderyouneed.yjy/p