java - How to change colors at paint(Graph) -


i have code paint in jpanel, dont know how change colors outside method paint()

i give code: 

public void paint(graphics g) {         graphics2d g2 = (graphics2d) g;         g2.setcolor(color.red);         (shape linea : lineas) { // dibuja todos las elipses             g2.draw(linea);         }     }

i know change color @ method using g2.setcolor(color.red); want change in actionlistener of menuitem.

simply add color variable in class , use variable set color on graphics. more appropriate override paintcomponent rather paint , calling super-method recommended.

see example randomly sets color of panel.

import java.awt.borderlayout; import java.awt.color; import java.awt.dimension; import java.awt.graphics; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.util.random;  import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.swingutilities;  public class testcoloredpanel {      private static class coloredpanel extends jpanel {          private color color = color.red;          @override         protected void paintcomponent(graphics g) {             super.paintcomponent(g);             g.setcolor(getcolor());             g.fillrect(0, 0, getwidth(), getheight());         }          public color getcolor() {             return color;         }          public void setcolor(color color) {             this.color = color;             repaint();         }          @override         public dimension getpreferredsize() {             return new dimension(300, 200);         }      }      protected void initui() {         final jframe frame = new jframe(testcoloredpanel.class.getsimplename());         frame.setdefaultcloseoperation(jframe.exit_on_close);         final coloredpanel panel = new coloredpanel();         frame.add(panel);         jbutton button = new jbutton("click me");         button.addactionlistener(new actionlistener() {              @override             public void actionperformed(actionevent e) {                 random r = new random();                 panel.setcolor(new color(r.nextint(256), r.nextint(256), r.nextint(256)));             }         });         frame.add(button, borderlayout.south);         frame.pack();         frame.setvisible(true);     }      public static void main(string[] args) {         swingutilities.invokelater(new runnable() {              @override             public void run() {                 new testcoloredpanel().initui();             }         });     } }

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