java - Call method when Key pressed -


i working opencv , video capture want call method takes frame based on key press. not sure doing wrong when run program when press space key image isn't being captured. here code:

public class videocap implements keylistener{  getcontours takeframe = new getcontours(); static{     system.loadlibrary(core.native_library_name); }  videocapture cap; mat2image mat2img = new mat2image(); mat copy = new mat(); videocap(){     cap = new videocapture();     cap.open(0); }   int frames = 0; /*int savedcount = 0; //keep track of saved frames string[] photos = {"first.png","second.png","third.png","forth.png", "fifth.png","sixth.png","seventh.png","eigth.png","ninth.png"}; */ boolean captured = false; bufferedimage getoneframe() {      frames++;      cap.read(mat2img.mat);      mat2img.mat = takeframe.captureframe(mat2img.mat);      if(captured == true){         mat2img.mat = takeframe.captureframe(mat2img.mat);         system.out.println("written!!!");         imgcodecs.imwrite("first.png", mat2img.mat);         system.exit(0);     }     return mat2img.getimage(mat2img.mat); } @override public void keypressed(keyevent e) {     if(e.getkeycode() == keyevent.vk_space){         captured = true;     }    }


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