java - how to resize image while resize frame using drawImage -


i have little problem. i'm learning java forms , want resize image while resize form. unfortunately resize form. image have still these same dimensions. how can rescale image? should change? wrong? enclose code:

    package przegladarka; import java.io.*; import java.util.arraylist; import java.awt.*;  import javax.swing.*; public class view extends jpanel {     image imag;      dimension size;     public static int framew=300;     public static int frameh=300;     static string[] children;     static arraylist<string> sciezki = new arraylist<string>();       public static void main(string[] args) {         file folder = new file("./zdjecia/");         visitallfiles(folder);          jframe frame = new jframe("przegladarka");         frame.setsize(300, 300);          frame.setvisible(true);         frame.getcontentpane().add(new mycanvas());         frame.setdefaultcloseoperation(jframe.exit_on_close);        }        public static void visitallfiles(file dir) {         if (dir.isdirectory()) {             children = dir.list();             (int = 0; < children.length; i++) {                 visitallfiles(new file(dir, children[i]));                 system.out.println(""+children[i]);                 image imag = toolkit.getdefaulttoolkit().getimage(children[i]);              }          } else {             system.out.println(dir.getabsolutepath() + " being processed.");             sciezki.add(dir.getabsolutepath());         }     } } class mycanvas extends jcomponent{     public void paint(graphics g){         graphics2d g2d = (graphics2d) g;          for(int i=0; i<view.sciezki.size();i++){              image imag = toolkit.getdefaulttoolkit().getimage(view.sciezki.get(i));           g2d.drawimage(imag, 0, 0, this);          g2d.finalize();         }     } }

first when drawimage you'll have not set x , y set width , height. able scale image. 

drawimage(image img, int x, int y, int width, int height, imageobserver observer)

your canvas should repainted when re-size form, if doesn't can force .repaint();

addition: told me wanted same size form. you'll have 2 things then. first use method mentioned above width this.getwidth() , height this.getheight refers canvas. you'll have make sure canvas scales frame can choosing appropriate layoutmanager. 

frame.setlayout(...)

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