java - Why is the graphic not working when the button number 8 is pressed? -


i have code , works until bottom middle button pressed.

import java.awt.*;  import javax.swing.jframe; import javax.swing.jpanel;  import java.awt.borderlayout; import java.awt.gridlayout;  import javax.swing.jbutton; import javax.swing.jlabel;  import java.awt.event.actionevent; import java.awt.event.actionlistener;  public class memory extends jframe {      /**      *      */     private static final long serialversionuid = 1l;      public void paintcomponent(graphics g) {         super.paintcomponents(g);         g.setcolor(new color(156, 93, 82));         g.fill3drect(21, 3, 7, 12, true);         g.setcolor(new color(156, 23, 134));         g.filloval(1, 15, 15, 15);         g.filloval(16, 15, 15, 15);         g.filloval(31, 15, 15, 15);         g.filloval(7, 31, 15, 15);         g.filloval(22, 31, 15, 15);         g.filloval(16, 47, 15, 15);     }      public memory() {          gridlayout h = new gridlayout(3, 3);         final jframe frame = new jframe();         final jpanel pan = new jpanel(h);         frame.add(pan);         //pan=new jpanel(h);         pan.setbackground(new color(130, 224, 190));         setfont(new font("serif", font.bold, 28));         jbutton button1 = new jbutton();         pan.add(button1);         final jlabel label1 = new jlabel("hi");         label1.setvisible(false);         pan.add(label1);         jbutton button2 = new jbutton();         pan.add(button2);         final jlabel label2 = new jlabel("hi");         label2.setvisible(false);         pan.add(label2);         jbutton button3 = new jbutton();         pan.add(button3);         final jlabel label3 = new jlabel("hi");         label3.setvisible(false);         pan.add(label3);         jbutton button4 = new jbutton();         pan.add(button4);         final jlabel label4 = new jlabel("hi");         label4.setvisible(false);         pan.add(label4);         jbutton button5 = new jbutton();         pan.add(button5);         final jlabel label5 = new jlabel("hi");         label5.setvisible(false);         pan.add(label5);         jbutton button6 = new jbutton();         pan.add(button6);         final jlabel label6 = new jlabel("hi");         label6.setvisible(false);         pan.add(label6);         jbutton button7 = new jbutton();         pan.add(button7);         final jlabel label7 = new jlabel("hi");         label7.setvisible(false);         pan.add(label7);         jbutton button8 = new jbutton();         pan.add(button8);         final jlabel label8 = new jlabel("hi");         label8.setvisible(false);         pan.add(label8);         jbutton button9 = new jbutton();         pan.add(button9);         final jbutton button10 = new jbutton("exit");         pan.add(button10);         setdefaultcloseoperation(exit_on_close);         settitle("memory game");         setlayout(new borderlayout());         add(pan, borderlayout.center);         add(button10, borderlayout.south);         setsize(600, 600);         setvisible(true);         final jlabel label9 = new jlabel("hi");         label9.setvisible(false);         pan.add(label9);         button1.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label1.setvisible(true);             }         });         button2.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label2.setvisible(true);             }         });         button3.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label3.setvisible(true);             }         });         button4.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label4.setvisible(true);             }         });         button5.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label5.setvisible(true);             }         });         button6.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label6.setvisible(true);             }         });         button7.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label7.setvisible(true);             }         }); //this thought going if pressed.         button8.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label8.setvisible(true);                 frame.getcontentpane().add(new memory());                 setvisible(true);              }         }                 );         button9.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 label9.setvisible(true);             }         }                 );         button10.addactionlistener(new actionlistener() {             public void actionperformed(actionevent arg0) {                 if (button10.getsize() != null) {                     system.exit(0);                 }             }         });      }      public static void main(string args[]) {         new memory();     }  }

memory extends jframe. swing won't let add window window.

you should avoid extending top level containers (this reason) , instead use jpanel.

this allows add component whatever container like

jframe not have paintcomponent method, never called. reason compiles you've called super.paintcomponents (note s @ end).

instead, should, extend jpanel , override it's paintcomponent method , perform custom painting there


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