Applet - JavaPurse does not have a public constructor

Hello,
I'm starting playing with Javacard and I tried to compile a demo of Java purse Applet.
I can compile it withou problem but once I try to start it with JBuilder 2006 I get the following error :
The applet com.sun.javacard.samples.JavaPurse.JavaPurse does not have a public constructor com.sun.javacard.samples.JavaPurse.JavaPurse()
Here is a part of my code
public class JavaPurse extends javacard.framework.Applet {
protected JavaPurse(byte[] bArray, short bOffset, byte bLength) {
public static void install(byte[] bArray, short bOffset, byte bLength) {
new JavaPurse(bArray, bOffset, bLength);
Does anyone of you know why JBuilder is displaying this error message?
Thanks in advance fo you reply.
Alain.

I don't think that's the error message; there is no class "java.awt.Applet". Are you sure it doesn't say "java.applet.Applet"?
In any event, I don't know about javacard, but I suspect that javacard applets are not interchangeable with browser applets. My guess is that when JBuilder tries to build an applet, it's thinking about browser applets. Therefore it expects your applet to be a subclass of java.applet.Applet.
I don't know how JBuilder works, but perhaps you can try using normal compilation instead of whatever JBuilder provides for applets.

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ERROR:The applet Tennisball does not have a public constructor Tennisball()

hi all...sorry...i encountered this java error msg with the following code.....n the error msg tat was generated is that i do not have a public constructor which i already have...can some1 please enlighten me..??
import java.applet.*;
import java.awt.*;
public class Tennisball
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          south=s;
          north=n;
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          //this.t = t;
          xinc=1.7*v;
          yinc=0.7*v;
     public void getRacketPosition(int racket_y)
          ry=racket_y;
          rs=ry;
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          x=20;
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          if(angle==2)yinc=-0.5*v;
          if(angle==3)yinc=-0.4*v;
          if(angle==4)yinc=-0.3*v;
          if(angle==5)yinc=0.3*v;
          if(angle==6)yinc=0.4*v;
          if(angle==7)yinc=0.5*v;
          if(angle==8)yinc=0.7*v;
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          enough=false;
          e=0;
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                    oldy=y;
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                    y+=yinc*v;
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                    int angle=(int)(Math.random()*8+1);
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                    if(angle==2)yinc=-0.5*v;
                    if(angle==3)yinc=-0.4*v;
                    if(angle==4)yinc=-0.3*v;
                    if(angle==5)yinc=0.3*v;
                    if(angle==6)yinc=0.4*v;
                    if(angle==7)yinc=0.5*v;
                    if(angle==8)yinc=0.7*v;
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                    else if(y>=ry+15&&y<ry+18)zone=6;
                    else if(y>=ry+18&&y<ry+21)zone=7;
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                    if(zone==2)yinc=-0.5*v;
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                    if(zone==4)yinc=-0.3*v;
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                    if(zone==8)yinc=0.7*v;
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          if(toggle)toggle();
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}

I thought I should point out a few things
The rule is that every class should have a no
argument constructor that you need to specify
explicitly if you have overloaded the default one.
One of the reaons for that is the following:This is not true, there are many classes that do not have a no argument constructor (For example Integer). Integer is a perfect example of why you would not want a no argument constructor, having an Integer with no value is pointless (theres nothing you can do with it).
public class A {
private final int a ;
public A(int b) {
this.a = b ;
}Now you realize that the variable
n
is getting initialized in the constructor. I see no variable n in the constructor but I take it you mean a
Now if you
refer to
n
somewhere else in you code you get a compile error because
n
might not have been initialized.This is not true, only local variables can cause a
variable (a variable) might not have been initialized
this is because all member fields are initialised with their default valuse. For example all pointers are intitialised to null, ints are intitialised to 0, booleans to false and so on.
>
So you need this:
public class A {
private final int a ;
public A(int b) {
this.a = b ;
public A() {
this(0) ; /* Calls the above constructor with some
default parameter. */
/* You can add some more code below but not above
this(0) */
Of course you know you are never calling the default
constructor but it's still there so you need to
ensure that the variables get initialized if some one
calls it!
As above classes can have no argument constructors
Just add this to your code for example:
public Tennisball() {
this(0, 0, 0, 0, null) ;
} Hope that helped you out!
Thanks,
Nikolas.
PS any duke dollars would be much appreciated as i'm
very poor at the moment :-)I dont mean to be offensive just thought I should clarify these points
Michael

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.

I thought I should point out a few things
The rule is that every class should have a no
argument constructor that you need to specify
explicitly if you have overloaded the default one.
One of the reaons for that is the following:This is not true, there are many classes that do not have a no argument constructor (For example Integer). Integer is a perfect example of why you would not want a no argument constructor, having an Integer with no value is pointless (theres nothing you can do with it).
public class A {
private final int a ;
public A(int b) {
this.a = b ;
}Now you realize that the variable
n
is getting initialized in the constructor. I see no variable n in the constructor but I take it you mean a
Now if you
refer to
n
somewhere else in you code you get a compile error because
n
might not have been initialized.This is not true, only local variables can cause a
variable (a variable) might not have been initialized
this is because all member fields are initialised with their default valuse. For example all pointers are intitialised to null, ints are intitialised to 0, booleans to false and so on.
>
So you need this:
public class A {
private final int a ;
public A(int b) {
this.a = b ;
public A() {
this(0) ; /* Calls the above constructor with some
default parameter. */
/* You can add some more code below but not above
this(0) */
Of course you know you are never calling the default
constructor but it's still there so you need to
ensure that the variables get initialized if some one
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As above classes can have no argument constructors
Just add this to your code for example:
public Tennisball() {
this(0, 0, 0, 0, null) ;
} Hope that helped you out!
Thanks,
Nikolas.
PS any duke dollars would be much appreciated as i'm
very poor at the moment :-)I dont mean to be offensive just thought I should clarify these points
Michael

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Applet - JavaPurse does not have a public constructor

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