Question on string array values

[Melinda Savoy]

I have taken a string value in some test code and found all the "\n" values in the string via the split method and created a string array (notes) for each split value. However now I am needing to breakup each string[] (notes) value to a 45 char max length and create a new string for each 45 char length or less for each string[] value until I get to end of that string[] value.

Any suggestions or direction would be greatly appreciated.

Here is the code I am working with:

public class SplitTestCode {
public static void main (String args[]) {
 
String note = "Case is significant in identifiers in Java, so if and If are considered to be quite different. \n"
+ "The language has a small set of reserved words such as if, while, etc. \n"
+ "They are all sequences of lower-case letters. \n"
+ "The Java language places no restrictions on what names you use for functions, variables, classes, etc. \n"
+ "However, there is a standard naming convention, which all the standard Java libraries follow, and which you must follow in this class.";
 
String[] notes = note.split("\n");
 
System.out.println("Notes length is " + notes.length);
 
String noteLine = null;
 
for (int i = 0; i < notes.length; i++) {

System.out.println(notes[i]);
}
}
}

[Srikanth Ramu]

Take each element of the array and use length() and substring(int beginIndex, int endIndex) methods.

For more details:

http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html

[Melinda Savoy]

Ok, I took a crack at the problem I explained above, but I am needing to break apart "noteLine" into 45 char chunk lines for each element in my string array and therefore the reason for this post.

Any help or direction would be greatly appreciated. Regards.

Here is the code I came up with but would appreciate any help:

    
public class SplitTestCode {
public static void main (String args[]) {
 
String note = "Case is significant in identifiers in Java, so if and If are considered to be quite different. \n"
+ "The language has a small set of reserved words such as if, while, etc. \n"
+ "They are all sequences of lower-case letters. \n"
+ "The Java language places no restrictions on what names you use for functions, variables, classes, etc. \n"
+ "However, there is a standard naming convention, which all the standard Java libraries follow, and which you must follow in this class.";
 
String[] notes = note.split("\n");
 
//System.out.println("Notes length is " + notes.length);
 
String noteLine = null;
 
for (int i = 0; i < notes.length; i++) {
noteLine = notes[i];
//System.out.println("Here is my note: " + noteLine + "\n" + "Length of this note: " + notes[i].length());
 
do {
if (notes[i].length() < 45){
noteLine = notes[i].substring(0, notes[i].length()-1);
System.out.println("Here is my note: " + noteLine);
}
else{
noteLine = notes[i].substring(0, 45);
if (notes[i].length() > 45) {
noteLine = notes[i].substring(45, notes[i].length()-1);
}else{
noteLine = null;
}
System.out.println("Here is my note: " + noteLine);
}
}while (notes[i] != null);
}
}
}
 

[Joanne Neal]

The following method should split each line into an array of String each 45 characters long (apart possibly from the last one).
I haven't tested it, so you may need to play around with the array indexes and substring parameters a little.

public String[] Line45(String line)
{
    String[] line45s = new String[(line.length() / 45) + 1];
    int start = 0;
    while (start < line.length()) {
        int end = start + 45;
        if (end > line.length()) {
            line45s[end / 45] = line.substring(start);
        } else {
            line45s[end / 45] = line.substring(start, end);
        }
        start += 45;
    }
    return line45s;
}

[Guido Sautter]

If you don't want to break up words, you might want to try this one:

public String[] Line45(String line) {
  String[] tokens = line.split("\\s"); // split original line at whitespaces
  ArrayList shortLines = new ArrayList();
  String shortLine = "";
  for (int t = 0; t < tokens.length; t++) {
    if ((shortLine + " " + tokens[t]).trim().length() < 45) {
      shortLine = (shortLine + " " + tokens[t]).trim();
    } else {
      shortLines.add(shortLine);
      shortLine = "";
    }
  }
  return ((String[]) shortLines.toArray(new String[shortLines.size()]));
}

[Melinda Savoy]

Hey guys,

Thanks so much for your time and help. I will give this a try.

Again, thanks so much.

Regards.