I have declared List<String> listOfValues = new ArrayList<String>();
It's outputs look like this:
[0.0,100.0,5.0],[1.0,200.0,8.0],[2.0,600.0,2.0],....
So for example, by calling listOFvalues.get(0) I would access 0.0,100.0,5.0
What I'm trying to do is, access and store its column values.
So basically I need store 0.0,1.0,2.0 as the first array/arrayList, 100.0,200.0,600.0 as the 2nd and so on.
The problem is, so far, I'm only able to get the whole Row (with listOfValues.get()).
You can use the String method Split to make an array from each String element.
List<String> splittedArray = new ArrayList<>();
for(String s: listOfValues)
{
for(String ss: s.split(",")) splittedArray.add(ss);
}
Then you can access each element through splittedArray.
Another option is to store the splitted elements into a matrix so they can be accessed as columns:
List<List<String>> matrix = new ArrayList<>();
for(String s: listOfValues)
{
matrix.add(Arrays.asList(s.split(",")));
}
for(List<String> row: matrix) { for(String element: row) { System.out.print(element+"\t"); } System.out.println(""); } If, on the other hand, you decided to use a plain array (splittedArray in my example): for(String element: splittedArray) System.out.println(element);matrix.get(0).get(1). splittedArray contains all your elements in one single row/column (as you would like to think about it).You could create your List extending ArrayList and overwriting the get method:
public class ColumnArrayList<T> extends ArrayList<String> {
public String get(int i) {
StringBuilder buffer = new StringBuilder();
String delim = "";
for(int j=0;j<super.size();j++) {
buffer.append(delim).append(super.get(j).split(",")[i]);
delim = ",";
}
return buffer.toString();
}
}
To see it working:
public class Demo {
public static void main(String[] args) {
List<String> listOfValues = new ColumnArrayList<String>();
listOfValues.add("0.0,100.0,5.0");
listOfValues.add("1.0,200.0,8.0");
listOfValues.add("2.0,600.0,2.0");
System.out.println(listOfValues.get(0));
System.out.println(listOfValues.get(1));
System.out.println(listOfValues.get(2));
}
}
Will print what you want:
0.0,1.0,2.0
100.0,200.0,600.0
5.0,8.0,2.0
You can use String class method split().
String temp="0.0,100.0,5.0";
String[] array=temp.split(",");
