eimai asxetos...

pyro · 23 Νοεμβρίου 2002

kalhmera paides!

lipwn, na mpw me th mia sto 0ema:

"Download Robot.class into your SD directory. Construct a Java applet RApplet.java that has

two buttons labelled "STEP" and "TURN" respectively,

a TextField length 20, labelled "location", that is not editable and

an object of class Robot.

Follow the same approach as Morelli in constructing code.

Build it by progressively adding parts.

Your applet's init() method should (amongst other things) construct a new Robot object using the constructor

public Robot(int x, int y, int face);

where x and y give the co-ordinates of the starting position of the Robot object and face is one of the named constants NORTH, EAST, SOUTH, WEST (in the Robot class).

When the "STEP" button is pressed the applet should invoke the void step() method on the Robot object.

When the "TURN" button is pressed the applet should invoke the void turn() method on the Robot object.

In either case the applet then invokes the String tell() method on the Robot object and display the returned String in the "location" TextField.

As a variant of the above, modify the applet by replacing the TextField by a TextArea and write each String returned by the tell() method on a new line in that TextArea."

loipwn, arxisa etsi:

<pre>code:<hr> public class RApplet extends java.applet.Applet {

/** Initialization method that will be called after the applet is loaded

* into the browser.

*/

public void init () {

Robot r;

r = new Robot("HAL");

Step = new Button("Step"); /mia erwthsh edw, to actionlistener prepei

Turn = mew Button("Turn"); /nte kai kala na exei diaforetiko onoma

Step.addActionListener(step); /ean einai se panw apo dyo efarmoges?

Turn.addActionListener(turn);

add(Step);

add(Turn);

}

public void actionPerformed (ActionEvent s)

{

(Step.getlabel().equals("Step"));

step.setLabel("going...");

}

public void actionPerformed (ActionEvent t)

{

(Turn.getlabel().equals("Turn"));

turn.setLabel("a round!");

}

} </pre><hr>

twra, se ola ta actionperformed mou bgazei cannot resolve symbol!

sto turn = new Button mou leei oti prepei na balw ; sto new!

ti ginete re paides?

help! :crazy:

Γηρυόνης · 23 Νοεμβρίου 2002

Κατ' αρχάς αυτό Turn = mew Button("Turn"); πρέπει να είναι Turn = new Button("Turn");

To actionListener δεν πρέπει να έχει διαφορετικό όνομα.

Για το cannot resolve symbol είσαι σίγουρος ότι έχεις εισάγει (import) την ActionEvent κλάση;

pyro · 23 Νοεμβρίου 2002

oops!

to actioneven pws to eisagw?

thanks

pyro · 23 Νοεμβρίου 2002

(dhladi kanw import ActionListener alla to actionlistener pws to ftiaxnw?)

Γηρυόνης · 23 Νοεμβρίου 2002

Καταχώρησε το μήνυμα λάθους που σου βγάζει.

pyro · 23 Νοεμβρίου 2002

RApplet.java [12:1] package Actionevent does not exist

import Actionevent.*;

^

RApplet.java [26:1] cannot resolve symbol

symbol : class ActionEvent

location: class RApplet

public void actionPerformed (ActionEvent s)

^

RApplet.java [31:1] cannot resolve symbol

symbol : class ActionEvent

location: class RApplet

public void actionPerformed (ActionEvent t)

^

RApplet.java [18:1] cannot resolve symbol

symbol : class Robot

location: class RApplet

Robot r;

^

RApplet.java [19:1] cannot resolve symbol

symbol : class Robot

location: class RApplet

r = new Robot("HAL");

^

RApplet.java [20:1] cannot resolve symbol

symbol : variable Step

location: class RApplet

Step = new Button("Step");

^

RApplet.java [20:1] cannot resolve symbol

symbol : class Button

location: class RApplet

Step = new Button("Step");

^

RApplet.java [21:1] cannot resolve symbol

symbol : variable Turn

location: class RApplet

Turn = new Button("Turn");

^

RApplet.java [21:1] cannot resolve symbol

symbol : class Button

location: class RApplet

Turn = new Button("Turn");

^

RApplet.java [22:1] cannot resolve symbol

symbol : variable step

location: class RApplet

Step.addActionListener(step);

^

RApplet.java [22:1] cannot resolve symbol

symbol : variable Step

location: class RApplet

Step.addActionListener(step);

^

RApplet.java [23:1] cannot resolve symbol

symbol : variable turn

location: class RApplet

Turn.addActionListener(turn);

^

RApplet.java [23:1] cannot resolve symbol

symbol : variable Turn

location: class RApplet

Turn.addActionListener(turn);

^

RApplet.java [24:1] cannot resolve symbol

symbol : variable Step

location: class RApplet

add(Step);

^

RApplet.java [25:1] cannot resolve symbol

symbol : variable Turn

location: class RApplet

add(Turn); }

^

RApplet.java [28:1] cannot resolve symbol

symbol : variable Step

location: class RApplet

(Step.getlabel().equals("Step"));

^

RApplet.java [29:1] cannot resolve symbol

symbol : variable step

location: class RApplet

step.setLabel("going...");

^

RApplet.java [33:1] cannot resolve symbol

symbol : variable Turn

location: class RApplet

(Turn.getlabel().equals("Turn"));

^

RApplet.java [34:1] cannot resolve symbol

symbol : variable turn

location: class RApplet

turn.setLabel("a round!");

^

19 errors

Errors compiling init.

</pre><hr>

basika ti 0elw na kanw:

na exw 2 koumpia to Step kai Turn,

otan pathsw ena na bgazei:

NORTH, EAST, SOUTH, WEST

kai analoga ama pathsa to Turn apla na gurizei kai ama pataw to step na phgenei...

Γηρυόνης · 23 Νοεμβρίου 2002

Κάνε

import java.awt.*;

Επίσης πρέπει να δηλώσεις και τη μεταβλητή Step.

Button Step = null;

έξω από την init() μέθοδο.

pyro · 23 Νοεμβρίου 2002

euxaristw polly gia thn olh boh0eia, pana dw ti mporw na kanw...

apoc · 23 Νοεμβρίου 2002

Προσεχε λιγο τα varuables η Java ειναι super case sensitive μια γραφεις Step απο κατω step.

Επισης γραφε proper if στα ActionPerformed και ασε τις μαγκιες για μετα!

Και το Step (οπως ειπε ο Γυρηονης) και το Turn εκτος απο την init το declaration .

pyro · 24 Νοεμβρίου 2002

loipwn:

/*

* RApplet.java

*

* Created on 23 Νοέμβριος 2002, 3:03 πμ

*/

/**

*

* @author pyro

* @version

*/

import java.awt.*;

public class RApplet extends java.applet.Applet {

/** Initialization method that will be called after the applet is loaded

* into the browser.

*/

Button Step = null;

public void actionPerformed (ActionEvent)

{

if (Step.getlabel().equals("Step"));

then (Step.setlaveb().equals("moving..");

}

public void actionPerformed (ActionEvent)

{

if (Turn.getlabel().equals("Turn"));

then (Step.setlabel().equals("around"));

}

public void init () {

Robot r;

r = new Robot("HAL");

Step = new Button("Step");

Turn = new Button("Turn");

Step.addActionListener(step);

Turn.addActionListener(turn);

add(Step);

add(Turn);

}

</pre><hr>

WoW MONO 4 errors!

RApplet.java [18:1] <identifier> expected

public void actionPerformed (ActionEvent)

^

RApplet.java [38:1] ')' expected

}

^

RApplet.java [18:1] cannot resolve symbol

symbol : class ActionEvent

location: class RApplet

public void actionPerformed (ActionEvent)

^

RApplet.java [18:1] missing method body, or declare abstract

public void actionPerformed (ActionEvent)

^

4 errors

Errors compiling class RApplet.

</pre><hr>

RApplet.java [38:1] ')' expected

} sygnwmh, pwses fores 0elei na kleisw???

Γηρυόνης · 24 Νοεμβρίου 2002

Ρε πύρο πάρε ένα βιβλίο Java και διάβασε ή έστω ψάξε λίγο.

Αυτό είναι λάθος:

if (Turn.getlabel().equals("Turn"));

then (Step.setlabel().equals("around"));

</pre><hr>

Το σωστό αφήνεται ως άσκηση στον αναγνώστη.

pyro · 24 Νοεμβρίου 2002

opa, sorry, ekana la0os sto code apo to biblio!

public void actionPerformed (ActionEvent)

{

if (Step.getlabel().equals("Step"));

Step.setLabel("movig...");

else

Step.seLabel("Step");

}

public void actionPerformed (ActionEvent)

{

if (Turn.getlabel().equals("Turn"));

Turn.setLabel("around!");

else

Turn.seLabel("Turn");

}

</pre><hr>

alla kai pali

RApplet.java [18:1] <identifier> expected

public void actionPerformed (ActionEvent)

^

RApplet.java [42:1] ')' expected

}

^

RApplet.java [18:1] cannot resolve symbol

symbol : class ActionEvent

location: class RApplet

public void actionPerformed (ActionEvent)

^

RApplet.java [18:1] missing method body, or declare abstract

public void actionPerformed (ActionEvent)

^

4 errors

Errors compiling actionPerformed.

</pre><hr>

ahhhhhh

loipwn, 0a to janarxoisw apo thn arxh, 0a to kanw apla na dumhourgei to robot, meta 0a tou balw to onomatou, kai meta 0a dw ti ginete me ta kompia...

euxaristw polly pantos

Γηρυόνης · 24 Νοεμβρίου 2002

Αυτό

if (Step.getlabel().equals("Step"));

Step.setLabel("movig...");

else

Step.seLabel("Step");

</pre><hr>

γράφεται ως

if (Step.getlabel().equals("Step"))

Step.setLabel("movig...");

else

Step.seLabel("Step");

</pre><hr>

επίσης κάνε

import java.awt.event.*;

pyro · 24 Νοεμβρίου 2002

baresa ton toixo apo ta neura mou kai ekana mia trypa...den jerw ti skata toixos einai alla sigoura tsimento den einai...

olo errors mou bgazei, taxw paizei, oute ena gamhmeno app pou na patas dyo gamhmena koumpakia den mporw na ftiajw???

sixtiri pia, mou ti dinei!!!!!!!

/bangs head on the wall

daimonas · 25 Νοεμβρίου 2002

Ελα ρε χαλάρωσε...αμα τα κάνεις τα κουμπάκια απλά και όχι γα####να ίσως είναι πιο εύκολο...:)

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