arrays

why does this sample applet not work? anything wrong with the array declaration??

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

public class dictionary extends Applet
{
TextField s;
int row=4;
int col=4;
//private String[][] dict = new String;
String[][] dict=new String[row][col];
dict[0][0]="man";
dict[0][1]="book";
dict[0][2]="girl";
dict[0][3]="pen";
dict[1][0]="homme";
dict[1][1]="livre";
dict[1][2]="fille";
dict[1][3]="stylo";

s=new TextField(8);
add(s);
s.addActionListener(this);

public void actionPerformed (ActionEvent e) {
// event handling for event comes from the textfield
if (e.getSource() == s) {
Graphics g = getGraphics(); // u
}

for (int s=0;(!dict[s].column.equals(s))
&&
(!dict[s].column.equals("END"));
s++)
{}

if (dict(s).column.equals("END"))
{
g.drawString("Word not found",10,10);
else
g.drawString("The French word for"+s+"is"+dict[s][(row+1)],10,10);
}
}
}
}

[dogbear]

WhoeverYouAre,

No offence but the code you've written is a confusing mess...


So I've rewritten it as best I could...
import java.awt.*;
import java.applet.*;

public class MyApplet extends Applet
{
// Place global class members here:
String[][] dictionary = new String[4][4];
java.awt.TextField wordTF = new java.awt.TextField();

public void init()
{
// initialize your String array:
dictionary[0][0]="man";
dictionary[0][1]="book";
dictionary[0][2]="girl";
dictionary[0][3]="pen";
dictionary[1][0]="homme";
dictionary[1][1]="livre";
dictionary[1][2]="fille";
dictionary[1][3]="stylo";
// initialize and add your TextField 'wordTF' :
add(wordTF);
}

public void actionPerformed(ActionEvent e)
{
// there was an event in the 'wordTF' TextField
if ( e.getSource() == wordTF )
{
String frenchWord = ""; // declare a String to hold the french word
String englishWord = wordTF.getText(); // declare a String to hold the english word

// now loop through your dictionary...
// if there is a match, assign 'frenchWord' with the proper index
for ( int column = 0 ; column < 4 ; column++ )
if ( dictionary[0][column].equals(englishWord) )
frenchWord = dictionary[1][column];

// check if 'frenchWord' has anything in it
// if not, then the word was not found...
if ( frenchWord.length() == 0 )
frenchWord = englishWord + " not found";

// call your Graphics and drawString methods here...
}

}
}



Keep an eye on where you instanciate and initiailize your variables.
Look closely at how arrays are indexed.

Hope this helps,

Regards,
dogBear

hi dogbear.

that corrected my dictionary applet to some extent..
but it still shows errors in lines 27, 28 and 30...


import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

public class dictionary extends Applet implements ActionListener{//placing global class members here
String[][] dict=new String[4][4];

TextField s=new TextField();

public void init() {//Initialising the string array

dict[0][0]="man";
dict[0][1]="book";
dict[0][2]="girl";
dict[0][3]="pen";
dict[1][0]="homme";
dict[1][1]="livre";
dict[1][2]="fille";
dict[1][3]="stylo";
add(s);//add the TextField here
}

public void actionPerformed(ActionEvent e) { ///this refers to an event in the 's' TextField
if (e.getSource()==s) {
String frenchWord="";//declare a string to hold the french word
String englishWord=s.getText();//declare a string to hold the English word from the textfield
frenchWord=dict[1][column];//If not, the word is not found
public void paint(Graphics g) {
g.drawString("French word:"+frenchWord,50,50);
}//ends graphics
} //ends condition 'if "s"'
if(frenchWord.length()==0){
frenchWord=englishWord + "is not found in our dictionary";
}
}//end of action event e
}//end of applet

[dogbear]

Anonymous,

What are the errors reported?

dogBear

errors are pointed as follows..


frenchWord=dict[1][column];/*It shows and error here.. I didnt understand the
message. But I suspect It doesnt recognise"column"..*/

Public void paint(Graphics g) { //>here it says statement expeted

g.drawString("French word:"+frenchWord,50,50);//>here it says "type expeceted"

[dogbear]

Anonymous,

Looks as if I'll have to do it all for you...

First of all, you are calling the Graphics.drawString(...) method from your ActionPerformed() method.
There's no Graphics object there!!!
You must call paint() if you want the result drawn and you must have a global String variable in your applet so that when paint() is called, the public void paint(Graphics g) that you've overridden can have a copy of the result in it!

So, after all that, here's an Applet that will do what you want...
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class MyApplet extends Applet implements ActionListener {
// Place global class members here:
String[][] dictionary = new String[4][4]; //the dictionary
java.awt.TextField wordTF = new java.awt.TextField(); //the input field
String searchResult = ""; //where you put the search results

public void init()
{
// initialize your String array:
dictionary[0][0]="man";
dictionary[0][1]="book";
dictionary[0][2]="girl";
dictionary[0][3]="pen";
dictionary[1][0]="homme";
dictionary[1][1]="livre";
dictionary[1][2]="fille";
dictionary[1][3]="stylo";
// initialize the Applet itself
setLayout(null);
setBounds(0,0,300,200);
// initialize and add your TextField 'wordTF' :
add(wordTF);
wordTF.setBounds(10,10,60,18);
wordTF.addActionListener(this);
}

public void actionPerformed(ActionEvent e)
{
// there was an event in the 'wordTF' TextField
if ( e.getSource() == wordTF )
{
String frenchWord = ""; // declare a String to hold the french word
String englishWord = wordTF.getText(); // declare a String to hold the english word
// now loop through your dictionary...
// if there is a match, assign 'frenchWord' with the proper index
for ( int column = 0 ; column < 4 ; column++ )
if ( dictionary[0][column].equals(englishWord) )
frenchWord = dictionary[1][column];
// check if 'frenchWord' has anything in it
// if not, then the word was not found...
if ( frenchWord.length() == 0 )
frenchWord = englishWord + " not found";

// store the result into the GLOBAL String object 'searchResult'
searchResult = frenchWord;
// call repaint()... which, in turn, will call your paint() method
repaint();
}
}

public void paint(Graphics g)
{
// have the applet draw the other things you don't care about...
super.paint(g);
// now draw your search results(which is stored in 'searchResult')
g.drawString(searchResult,10,40);
}
}



The Applet will look like it's been designed by my dead cat, but you can fix that easily.

Regards,
[b]dogBear[b]