Writing contents of String array to a text file
I have written a program that writes elements stored in variables to a text file. It uses the BufferedWriter/FileWriter classes. I want to output an Array of type String onto the text file but it is not allowing me to output the Array. I am using eclipse to run the writer and it shows up an error for the command;
out.write(order.getExtraFillings());
extraFillings is declared as;
private String[] extraFillings
and getExtraFillings() is its getter method. The error i get is;
"The method write(int) in the type BufferedWriter is not applicable for the
arguments (String[])"
I understand that this means the write method does not accept an array string as an argument, but how do I then write the Array into the text file?
I DontKnowJack if this is what you're looking for!
StringBuffer sb = new StringBuffer();
for(int i = 0; i < extraFillings.length; i++){
sb.append(extraFillings[i]);
sb.append(" "); //dou you want to separate the contents by an empty space?
}
out.write(sb.toString();
regards,
Manuel Leiria
Here's one I prepared earlier...
class StringArrayUtils {
public static String join(String[] a, String FS) {
if (a==null) return "";
StringBuffer sb = new StringBuffer(a[0]);
for(int i=1; i<a.length; i++) {
sb.append(FS + a[i]);
}
return sb.toString();
}
public static String join(String[] a) {
return join(a, ", ");
}
public static void main(String[] args) {
String[] words = { "Hello", "World!" };
System.out.println(join(words));
}
}
It would be nice to genericise this to Object[] somehow... but I don't know how (yet).
Keith.>
If you are using at least Java 1.5:
out.write(Arrays.toString(order.getExtraFillings()));
where Arrays is java.util.Arrays.
If you are using Java 1.4 or below:
out.write(Arrays.asList(order.getExtraFillings()).toString());
Either of these should give a String that looks like the following:
[fillings0, fillings1, fillings2, fillings3]
If you don't like that format, you'll have to loop over the array yourself, as the other two posters' code suggested.
> It would be nice to genericise this to Object[]
> somehow... but I don't know how (yet).
Initialize the StringBuffer as:
StringBuffer sb = new StringBuffer(a[0].toString());
And I don't think the rest will need to change at all. The FS + a[ i ] will automatically cause toString to be called on the other elements of 'a'.
Cool! this works (in 1.6)... Thanx doremifasollatido.
class StringArrayUtils {
public static String join(Object[] a, String FS) {
if (a==null) return "";
StringBuffer sb = new StringBuffer(""+a[0]);
for(int i=1; i<a.length; i++) {
sb.append(FS+a[i]);
}
return sb.toString();
}
public static String join(Object[] a) {
return join(a, ", ");
}
public static void main(String[] args)
{
String[] words = { "Hello", "World!" };
System.out.println(join(words));
Integer[] integers = { 1, 2, 3 };
System.out.println(join(integers));
}
}
>
> Cool! this works (in 1.6)... Thanx doremifasollatido.
You're welcome. It should work in 1.5, too. And, if you create the Integers yourself (use a constructor, instead of using autoboxing), it would work in 1.4 and below, too.
For 1.5 or 1.6, I would suspect that StringBuilder should be used instead of StringBuffer.
> StringBuffer sb = new StringBuffer(""+a[0]);
Eww! I like a[0].toString() better. Or String.valueOf(a[0]). But, definitely not appending to an empty String.
