Write a simple user login interface

1, if the user name and password do not fill out//pop-up message dialog prompts to enter the user name and password//2, if the user name and password is filled in//(1), if the user name and password is filled in the admin pop-up message dialog box, prompt login Success//(2), If the user name and password are filled in two are not admin pop-up dialog box prompt login or password errorimport Java.awt.gridlayout;import java.awt.event.actionevent;import java.awt.event.ActionListener;import javax.swing.jbutton;import javax.swing.jframe;import javax.swing.jlabel;import Javax.swing.JOptionPane; Import Javax.swing.jpanel;import Javax.swing.jpasswordfield;import Javax.swing.jtextfield;import Javax.swing.event.AncestorListener;Public classUsertestextendsJFrameImplementsActionListener () {//Add tagsJlable ul = new jlable (user name); Jlable PL = new jlable (password);//text box, lengthjtextfiled ut = new JTextField (13);//Password box, length ofJtexedfield pt = new JTextField (13);//ButtonJButton login = new JButton ("login"); JButton Cancel = new JButton ("Cancel");//PanelJPanel P1 = new JPanel (); Jpanel P2 = new Jpanel (); JPanel p3 = new JPanel ();//Construction methodPublic Usertest () {this.settitle ("User login Test");//Add the control to the panelP1.add (UL);p 1.add (UT);p 2.add (PL);p 2.add (UT);p 3.add (login);p 3.add (cancel);//Set form sizeThis.setsize (200,200);//Set form layout mode Grid layout 2 rows 3 columnsThis.setlayout (new GridLayout (2,3));//Put the Panel on the formThis.add (p1); This.add (p2); This.add (p3);//form visibleThis.setvisible (TRUE);
//form can be closedThis.setdefaultcloseoperation (Jframe.exit_on_close);@Override       //Override listener methodpublic void actionperformed (ActionEvent e) {if (e.getsource () = = login) {//Monitor Login buttonif (Ut.gettext (). Equals ("admin") &&pt.gettext (). Equals ("admin")) {//Do not overwrite formJoptionpane.showmessagedialog (NULL, "Login succeeded");} else if (Ut.gettext (). Equals ("") | | Pt.gettext (). Equals ("")) {Joptionpane.showmessagedialog (null, "User name or password cannot be null");} Else{joptionpane.showmessagedialog (NULL, "User name or password error");}}} Public Staticvoid Main (string[] args) {new usertest ();//Invoke parameterless construction method test program}

Write a simple user login interface