In Java Jframe open another JFrame but JFrame show nothing -


i java program eclipse window builder, there got 2 class

  1. login.java
  2. menu.java

so when username , password matched , login.java close , menu.java open

in code, try using

if(true) {           menu menu = new menu();        menu.setvisible(true);        login.dispose(); } else {     joptionpane.showmessagedialog(null, "wrong username or password",    "message", joptionpane.information_message); }

and run login.java, menu.java show, in mini size , when expand it, menu.java nothing contain.

i watched video tutorial on youtube, teach in way when try not working, hope can , thank lot.

menu menu= new menu(); menu.frame.setvisible(true);

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