Testing and Encapsulation 5.2

 Packagesz;ImportJava.util.*;Importjava.applet.*;//Introducing the Applet classImportjava.awt.*; Importjava.awt.event.*;//Introduce the System event class package.  Public classV11extendsAppletImplementsactionlistener{//defines the class and implements the action event listener interface. Label Label1,label2,label3,label4;//declares four label objects. TextField TF1;//Declaring a text box objectTextArea area;//declares a text area objectButton Bt1,bt2;//declaring two Button objects    Doublelb2=0.0; intS=0; intA=0; intB=0; intY=0; intZ=0;//s saves the total number of questions, a saves the correct number of questions, and B saves the wrong number of answers.  Public voidInit () {//initialized. label1=NewLabel ();//create an object that does not display content. Label2=NewLabel (); Label3=NewLabel (); Label4=NewLabel ("=");//create an object that displays the content as "=". tf1=NewTextField (8); Area=NewTextArea (13,40);//Create a text area of 13 rows and 40 columns. bt1=NewButton ("scoring");//Create a button that displays the title "Scoring". Bt2=NewButton ("Redo");    Add (Label1);    Add (Label2);    Add (LABEL3);    Add (LABEL4);    Add (TF1);    Add (area);    Add (BT1);    Add (BT2);  This. setSize (400, 150); //use sequential layouts to add components. Tf1.addactionlistener ( This); Bt1.addactionlistener ( This); Bt2.addactionlistener ( This);//Register this as the Click event Listener for FT1, BT1, BT2. Label1.settext (String.valueof (int) (Math.random () *10))); Label3.settext (string.valueof (int) (Math.random () *10));//randomly generate two or 10 integers and display them on labels 1 and 3, respectively. Lb2= (Math.random ());//randomly generates a decimal within a 0~1.     if(Lb2>=0 && lb2<=0.25) Label2.settext ("+"); Else if(lb2>0.25 && lb2<=0.5) Label2.settext ("-"); Else if(lb2>0.5 && lb2<=0.75) Label2.settext ("*"); Else if(lb2>0.75 && Lb2<=1) Label2.settext ("/"); }    //The IF statement is used to control the random display of "+,-, *,/" four operators.   Public voidactionperformed (ActionEvent e) {//implements the event interface method.      if(E.getsource () ==TF1) {//determine if the event source is TF1 or BT1 or BT2. s=s+1;//One trigger TF1 total number of questions added 1.     if(Label2.gettext () = = "+"){         intX=integer.parseint (Label1.gettext ()) +Integer.parseint (Label3.gettext ());//The characters are converted into numeric values.      if(x==Integer.parseint (Tf1.gettext ())) a=a+1;//If the text box is entered correctly, the number of correct answers is plus one.      Elseb=b+1;//If the text box entered an error, add one to the wrong number.      }     Else if(Label2.gettext () = = "-"){         intX=integer.parseint (Label1.gettext ())-Integer.parseint (Label3.gettext ()); if(x==Integer.parseint (Tf1.gettext ())) a=a+1; Elseb=b+1; }     Else if(Label2.gettext () = = "*"){         intX=integer.parseint (Label1.gettext ()) *Integer.parseint (Label3.gettext ()); if(x==Integer.parseint (Tf1.gettext ())) a=a+1; Elseb=b+1; }     Else if(Label2.gettext () = = "/") {y=Integer.parseint (Label1.gettext ()); Z=Integer.parseint (Label3.gettext ());  Do{label3.settext (string.valueof (int) (Math.random () *10))); Z=Integer.parseint (Label3.gettext ()); }                 while(z==0);//The dividend is not 0 with the loop guarantee.                 DoubleX=double.parsedouble (Label1.gettext ())/Integer.parseint (Label3.gettext ()); if(Math.Round (x) = = (Integer.parseint (Tf1.gettext ())))//Ensure that two numbers are divided and rounded up again. A=a+1; Elseb=b+1; } label1.settext (String.valueof (int) (Math.random () *10))); Label3.settext (string.valueof (int) (Math.random () *10))); LB2=Math.random (); if(Lb2>=0 && lb2<=0.25) Label2.settext ("+"); Else if(lb2>0.25 && lb2<=0.5) Label2.settext ("-"); Else if(lb2>0.5 && lb2<=0.75) Label2.settext ("*"); Else if(lb2>0.75 && Lb2<=1) Label2.settext ("/"); Tf1.settext (""); }     Else if(E.getsource () ==bt1) {//bt1 button click event. Area.settext ("");//clears the text area. Area.append ("*********************************************" + "\ n");Area.append ("A total Answer:" +s+ "problem.) "+" \ n "); Area.append ("Congratulations to you!" Answer correctly: "+a+" problem, Answer wrong: "+b+" problem.                                     "+" \ n "); Area.append ("_____________________________________________" + "\ n"); Area.append ("Your current score is:" + ((a*100)/s));//add text to the text area.          }     Else if(E.getsource () ==bt2) {//BT2 button click event. Area.settext (""); Label1.settext (string.valueof (int) (Math.random () *10))); Label3.settext (string.valueof (int) (Math.random () *10))); LB2=Math.random (); if(Lb2>=0 && lb2<=0.25) Label2.settext ("+"); Else if(lb2>0.25 && lb2<=0.5) Label2.settext ("-"); Else if(lb2>0.5 && lb2<=0.75) Label2.settext ("*"); Else if(lb2>0.75 && Lb2<=1) Label2.settext ("/"); Tf1.settext (""); }     } }

Huang Weijun	http://www.cnblogs.com/hwj23/
Liuheng	http://home.cnblogs.com/u/iliuh/

Testing and Encapsulation 5.2