Java job Calculator

Import Java. AWT .*;
 Import Java. AWT. event .*;
 Import Javax. Swing .*;

 Public   Class Calculator Implements Actionlistener {
Jframe JF = New Jframe ("Calculator by chenyadong ");
Jtextfield TF = New Jtextfield (); //  Area of the input number 
     
 Double Data; // Records the data before the input symbol. 
String operator; // Symbol bit 
 Boolean Clickable = True , Clear = True ; //  Clickable is used to determine "." And clear is used to determine whether to click the symbol bit to clear the screen.  
     
 Public   Void Init (){
JF. setsize (300,200 );//  SET SIZE  
 JF. setvisible ( True ); //  Set to visible  
         
Container c = JF. getcontentpane (); //  Get the content pane object of jframe.  
     
TF. sethorizontalalignment (jtextfield. Right ); //  Right alignment  
 C. Add (TF, "North ");

Jpanel pn1 = New Jpanel ( New Gridlayout (4, 4 )); //  Operation Interface  
 C. Add (pn1, "center ");

Jbutton B = New Jbutton ("7 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("8 ");
B. addactionlistener (This );
Pn1.add (B );
B = New Jbutton ("9 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("/");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("4 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("5 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("6 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("*");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("1 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("2 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("3 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("-");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("0 ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton (".");
B. addactionlistener ( This );
Pn1.add (B );
B =New Jbutton ("= ");
B. addactionlistener ( This );
Pn1.add (B );
B = New Jbutton ("+ ");
B. addactionlistener ( This );
Pn1.add (B );
}

 Public   Void Actionreceivmed (actionevent e ){
 //  Todo auto-generated method stub 
 String temp = E. getactioncommand (); //  Get button tag  
          If (Temp = "0 "){
 If (Clear = False ){ //  Determine whether the symbol bit is clicked  
 TF. settext ("");
}
TF. settext (Tf. gettext () + "0 ");
}
 If (Temp = "1 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "1 ");
Clear = True ;
}
 If (Temp = "1 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "1 ");
Clear = True ;
}
 If (Temp = "2 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "2 ");
Clear = True ;
}
 If (Temp = "3 "){
If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "3 ");
Clear = True ;
}
 If (Temp = "4 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "4 ");
Clear = True ;
}
 If (Temp = "5 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "5 ");
Clear = True ;
}
 If (Temp = "6 "){
 If (Clear =False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "6 ");
Clear = True ;
}
 If (Temp = "7 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "7 ");
Clear = True ;
}
 If (Temp = "8 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "8 ");
Clear = True ;
}
 If (Temp = "9 "){
 If (Clear = False ){
TF. settext ("");
}
TF. settext (Tf. gettext () + "9 ");
Clear = True ;
}

 If (Temp = "."){
Clickable = True ;
 For ( Int I = 0; I <TF. gettext (). Length (); I ++ ){ //  Traverse to determine if "." already exists "."  
                 If (Tf. gettext (). charat (I) = '.'){
Clickable = False ;
 Break ;
}
}
 If (Clickable = True ){
TF. settext (Tf. gettext () + ".");
}
}

 Try {
 If (Temp = "+ "){
Data = double. parsedouble (Tf. gettext ()); //  String parsed to double type  
 Operator = "+ ";
Clear = False ;
}
 If (Temp = "-"){
Data = double. parsedouble (Tf. gettext ());
Operator = "-";
Clear = False ;
}
 If (Temp = "*"){
Data = double. parsedouble (Tf. gettext ());
Operator = "*";
Clear = False ;
}
 If (Temp = "/"){
Data = double. parsedouble (Tf. gettext ());
Operator = "/";
Clear = False ;
}

 If (Temp = "= "){
 Double Data2 = double. parsedouble (Tf. gettext ());
TF. settext ("");
 If (Operator = "+ ")
TF. settext (Data + data2 + ""); //  + "" To string type  
                  If (Operator = "-")
TF. settext (data-data2 + "");
 If (Operator = "*")
TF. settext (Data * data2 + "");
 If (Operator = "/")
TF. settext (data/data2 + "");
Clear = False ;
}
} Catch (Exception ee ){
System. Out. println ("During calculation, enter the number first ");
Clear = False ;
}

}

 Public   Static   Void Main (string ARGs []) {
 New Calculator (). INIT ();
}

}