Java applet 1

Math problem practice, correct a question, in the text area to print out, answer wrong error, a total of 10 simple math problems

//mathproblem.java mainly involves the interface font
Importjava.awt.*;Importjava.awt.event.*;ImportJavax.swing.JTextArea;ImportJavax.swing.JTextField; Public classMathproblemextendsFrameImplementsActionListener {Private Static Final LongSerialversionuid = 1L;    TextArea Ta;    JTextField TF1,TF2;    Label lb1,lb2;    Button BT1,BT2,BT3;    Panel P1,P2,P3,P4,P5,P6;    Frame F;    Font fo;    Color color;    String Tips1;    String TIPS2; inti; Question Qu=NewQuestion (); Mathproblem () {fo=NewFont ("Arial", font.bold,20); Color=Color.Black; Tips1= "Answer right!" "; TIPS2= "Answer the wrong!" "; I=0; Ta=NewTextArea ();        Ta.setfont (FO);        Ta.setforeground (color); Ta.setsize (480, 180); Ta.seteditable (true); TF1=NewJTextField (20); TF2=NewJTextField (10);        Tf1.sethorizontalalignment (Jtextfield.center);        Tf1.settext (Qu.math[i]); Tf1.seteditable (true); Tf2.seteditable (true); LB1=NewLabel ("title:"); LB2=NewLabel ("Answer:"); BT1=Newbutton ("OK"); BT2=NewButton ("Previous question"); BT3=NewButton ("Next question"); Bt1.addactionlistener ( This); Bt2.addactionlistener ( This); Bt3.addactionlistener ( This); P1=NewPanel (); P2=NewPanel (); P3=NewPanel ();        P1.add (TA);        P2.add (LB1);        P2.add (TF1);        P2.add (LB2);        P2.add (TF2); P3.setlayout (NewGridLayout (1,3));        P3.add (BT1);        P3.add (BT2);                P3.add (BT3); F=NewFrame ("Exercises"); F.setvisible (true); F.setresizable (false); F.setsize (700, 370); F.setlocationrelativeto (NULL);        F.add (P1,borderlayout.north);        F.add (P2,borderlayout.center);        F.add (P3,borderlayout.south); F.addwindowlistener (NewWindowadapter () { Public voidwindowclosing (windowevent e) {system.exit (0);            }        }); }     Public voidactionperformed (ActionEvent e) {if(E.getsource (). Equals (BT1)) {if(Tf2.gettext (). Equals (Qu.mathkey[i])) {Ta.setforeground (color.                GREEN); Ta.settext (Qu.math[i]+qu.mathkey[i]+ "\ n" +TIPS1); }            Else{ta.settext (TIPS2); Ta.setforeground (color.            RED); }        }        if(E.getsource (). Equals (BT2)) {i--;            Ta.setforeground (color); if(i>=0) {Tf1.settext (qu.math[i]); Tf2.settext (NULL); Ta.settext (NULL); }            Else{Ta.settext ("It's already the first question!" "); I=0; }        }        if(E.getsource (). Equals (BT3)) {i++;            Ta.setforeground (color); if(i<=9) {Tf1.settext (qu.math[i]); Tf2.settext (NULL); Ta.settext (NULL); }            Else{Ta.settext ("It's the last question!" "); I=9; }        }            }     Public Static voidMain (String args[]) {Mathproblem MP=NewMathproblem (); }}

//question.java Placement Questions and Answers
Public classQuestion {string[] math; String mathkey[]={"2", "4", "8", "2", "7", "45", "4", "124", "132", "1"}; Question () {Math=NewString[10]; math[0]= "1+1="; math[1]= "10-6 ="; math[2]= "2*4="; math[3]= "6÷3="; math[4]= "1+2*3="; math[5]= "(100-10) *2="; math[6]= "(7+1) ÷2="; math[7]= "1+123="; math[8]= "64÷2+100="; math[9]= "8+1-8="; }}

Java applet 1