java - How do you send call to main class from a class file? -

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hi have 1 main program file 2 class files involved in this. in main class file create frame , control how interact. 1 of class files needs talk main class file change 3rd file. trying go find out how call sent back.

the main class file:

public class mainframe extends javax.swing.jframe {  public mainframe() {     buttonpanel1 = new buttonpanel();     textpanel1 = new textpanel();     textpanel2 = new textpanel();      setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);     javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());     getcontentpane().setlayout(layout);     layout.sethorizontalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(layout.createsequentialgroup()             .addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.leading, false)                 .addcomponent(buttonpanel1, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)                 .addcomponent(textpanel1, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)                 .addcomponent(textpanel2, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)))     );     layout.setverticalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(layout.createsequentialgroup()             .addcomponent(buttonpanel1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)             .addcomponent(textpanel1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)             .addcomponent(textpanel2, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size))     );     pack(); }                       public static void main(string args[]) {     java.awt.eventqueue.invokelater(() -> {         new mainframe().setvisible(true);     }); }  public void copytext() {     textpanel2.settext(textpanel1.gettext()); }  private buttonpanel buttonpanel1; private textpanel textpanel1; private textpanel textpanel2;

}

the button class file tries call main file. change 3rd file.

public class buttonpanel extends javax.swing.jpanel {     public buttonpanel() {         jbutton1 = new javax.swing.jbutton();         jbutton1.settext("change");         jbutton1.addactionlistener((java.awt.event.actionevent evt) -> {   //i tell main frame textpanel1 , put textpanel2         mainframe.copytext();           });         javax.swing.grouplayout layout = new javax.swing.grouplayout(this);         this.setlayout(layout);         layout.sethorizontalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup().addcomponent(jbutton1))         );         layout.setverticalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup().addcomponent(jbutton1))         );     }                                                               private javax.swing.jbutton jbutton1;              }

and 1 being changed:

public class textpanel extends javax.swing.jpanel { public textpanel() {     jtextfield1 = new javax.swing.jtextfield();     jtextfield1.settext("hello");      javax.swing.grouplayout layout = new javax.swing.grouplayout(this);     this.setlayout(layout);     layout.sethorizontalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(javax.swing.grouplayout.alignment.trailing, layout.createsequentialgroup()             .addcomponent(jtextfield1, javax.swing.grouplayout.default_size, 59, short.max_value))     );     layout.setverticalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(layout.createsequentialgroup()             .addcomponent(jtextfield1, javax.swing.grouplayout.preferred_size,        javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size))         );     }                          public string gettext(){         return jtextfield1.gettext();     }     public void settext(string str){         jtextfield1.settext(str);     }                        private javax.swing.jtextfield jtextfield1;       }

if make method static, work, won't able directly access object.

mainframe.copytext();

otherwise, pass reference mainframe buttonpanel. example:

public buttonpanel(mainframe mainframe) {     this.mainframe = mainframe; ... }

and create on mainframe:

new buttonpanel(this);

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