Elementary school student Arithmetic in Java

Importjava.awt.*;Importjava.awt.event.*;Importjava.io.FileNotFoundException;Importjava.io.IOException;Importjavax.swing.*; Public classLoginextendsJFrame {PrivateTextField F1; PrivateTextField F2; PrivateJButton B1; PrivateJButton B2; PrivateJButton B3; Yunsuan SCS=NewYunsuan (); //Login Interface     PublicLogin () {Container CP=getcontentpane ();//ContainerCp.setlayout (NewGridLayout (3,1));//three row one column layoutLabel l1=NewLabel ("User name"); Label L2=NewLabel ("Password"); Panel P1=NewPanel (); Panel P2=NewPanel (); Panel P3=NewPanel (); F1=NewTextField (10); F2=NewTextField (10); F2.setechochar (‘*‘);//Echo character is *b1=NewJButton ("Login"); B2=NewJButton ("Reset"); B3=NewJButton ("Exit"); P1.add (L1);//The first line adds a label 1P1.add (F1);        P2.add (L2);        P2.add (F2);        P3.add (B1);        P3.add (B2);        P3.add (B3);        Cp.add (p1);        Cp.add (p2);        Cp.add (p3); B1.addactionlistener (NewEnter ()); B2.addactionlistener (NewReWrite ()); B3.addactionlistener (NewClose ()); }    classEnterImplementsactionlistener{ Public voidactionperformed (ActionEvent e) {if((F1.gettext ()). Equals ("Czp") && (F2.gettext ()). Equals ("123456") {Yunsuan frame1=NewYunsuan (); Frame1.setbounds (200, 200, 300, 300); Frame1.setvisible (true); }                 ElseJoptionpane.showmessagedialog (NULL, "The user name or password is wrong, please login again!" "); }    }    classReWriteImplementsactionlistener{ Public voidactionperformed (ActionEvent e) {F1.settext (""); F2.settext ("");        F1.requestfocus (); }    }    classCloseImplementsactionlistener{ Public voidactionperformed (ActionEvent e) {JButton BT=(JButton) E.getsource (); if(bt==B3) {System.exit (0); }        }}//Main Function Program start     Public Static voidMain (string[] args) {Login log=NewLogin (); Log.settitle ("System Login"); Log.setbounds (200, 200, 300, 300);        Log.setbackground (Color.Blue); Log.setvisible (true); NewYunsuan (); }}ImportJava.awt.Color;ImportJava.awt.Container;Importjava.awt.GridLayout;ImportJava.awt.Label;ImportJava.awt.Panel;ImportJava.awt.TextField;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.WindowEvent;ImportJava.io.File;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;Importjava.io.IOException;ImportJava.io.ObjectInputStream;Importjava.util.ArrayList;ImportJavax.swing.JButton;ImportJavax.swing.JComboBox;ImportJavax.swing.JFrame;ImportJavax.swing.JLabel;ImportJavax.swing.JOptionPane;ImportJavax.swing.JPanel;ImportJavax.swing.JTextField; Public classYunsuanextendsJFrame {PrivateJTextField TextNum1; PrivateJTextField textNum2; PrivateJTextField result; PrivateJTextField RESULT1; PrivateJComboBox opers;  PublicYunsuan () {init (); SetSize (300,100); Setlocationrelativeto (NULL); Settitle ("Elementary School Math"); Setdefaultcloseoperation (3); SetVisible (false); }         Private voidinit () {string[] operators= "+,-, *,/". Split (","); TextNum1=NewJTextField (); Textnum1.setcolumns (10); TextNum2=NewJTextField (); Textnum2.setcolumns (10); Result=NewJTextField (); Result.setcolumns (10); RESULT1=NewJTextField (); Result1.setcolumns (10); Opers=NewJComboBox (operators); Opers.addactionlistener (NewActionListener () {@Override Public voidactionperformed (ActionEvent e) {intoperator =Opers.getselectedindex (); DoubleNUM1 =double.parsedouble (Textnum1.gettext ()); Doublenum2 =double.parsedouble (Textnum2.gettext ()); Switch(operator) { Case0:result1.settext (NUM1 + num2+ ""); Break;  Case1:result1.settext (num1-num2+ ""); Break;  Case2:result1.settext (NUM1 * num2+ ""); Break;  Case3:result1.settext (num1/num2+ ""); Break;                          }                             }                   }); JPanel P=NewJPanel ();        P.add (TEXTNUM1);        P.add (TEXTNUM2);        P.add (opers);        P.add (result);        P.add (RESULT1);  This. Add (P); }}

Elementary school student Arithmetic in Java