swing - How JOptionPane.showInputMessage() is implemented in Java -

i need information can create custom login dialog.

public static void main(string args[]) {      joptionpane.showinputdialog("enter username: ");       // show dialog , after 'ok' button clicked       // dialog, return input string, right?  } 

so, created new class extends jdialog includes 2 labels, 2 text fields , 1 button, after button clicked want simulate joptionpane.showinputdialog() want wait user input before other code proceed.

public static void main(string args[]) {    logindialog ld=new logindialog();    ld.setvisible(true);    // when button clicked want code continue...    dl.getusername();    dl.getpassword(); }