java - Paint not showing up -


i using jframe , pane , trying draw simple square. painting not showing up. made set color black should visible. code:

    package w2;      import java.awt.color;     import java.awt.container;     import java.awt.graphics;     import javax.swing.*;             public class w2 {          jframe frame = new jframe("w2");          public w2(){                             container pane = new container();             frame.setcontentpane(pane);             frame.setsize(750,500);             frame.setlocationrelativeto(null);             frame.setresizable(false);             frame.setvisible(true);         }          public void paint(graphics g){             g.setcolor(color.black);             g.fillrect(50, 50, 50, 50);         }          public static void main(string args[]){             new w2();         }      }

the paint method won't called because it's not part of object can painted.

see performing custom painting details how painting done in swing

for example...

frame.setcontentpane(new jpanel() {     @override     protected void paintcomponent(graphics g) {         super.paintcomponent(g);         g.setcolor(color.black);         g.fillrect(50, 50, 50, 50);     } });

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