How to create a table based on a two-dimensional array?

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I have a series of list in this list:

Java

private List<List<String>> tableOverallList;

This object contains 8 values in each list. I need to place it in the table created. would like to have 2 Rows with 8 columns:

Java

String[] tableTitleList = {" Title", " (Re)set", " Obs", " Mean",
    " Std.Dev", " Min", " Max", "Unit"};
List<String> tabTitleList = Arrays.asList(tableTitleList);

Please help me to place the 1st list of values inside the List tableOverallList in the 2nd Row. I will try managing with the rest of the list.

Java

PdfPTable table = new PdfPTable(3); // 3 columns.
PdfPCell cell1 = new PdfPCell(new Paragraph("Cell 1"));
PdfPCell cell2 = new PdfPCell(new Paragraph("Cell 2"));
PdfPCell cell3 = new PdfPCell(new Paragraph("Cell 3"));
PdfPCell cell4 = new PdfPCell(new Paragraph("Cell 4"));
PdfPCell cell5 = new PdfPCell(new Paragraph("Cell 5"));
PdfPCell cell6 = new PdfPCell(new Paragraph("Cell 6"));
PdfPCell cell7 = new PdfPCell(new Paragraph("Cell 7"));
PdfPCell cell8 = new PdfPCell(new Paragraph("Cell 8"));
table.addCell(cell1);
table.addCell(cell2);
table.addCell(cell3);
table.addCell(cell4);
table.addCell(cell5);
table.addCell(cell6); 
table.addCell(cell7);
table.addCell(cell8);
document.add(table);

Posted on StackOverflow on Jun 25, 2014 by srinivasan

That's really easy. So you have data in a nested list. For instance:

Java

public List < List < String >> getData() {
  List < List < String >> data = new ArrayList < > ();
  String[] tableTitleList = {
    " Title",
    " (Re)set",
    " Obs",
    " Mean",
    " Std.Dev",
    " Min",
    " Max",
    "Unit"
  };
  data.add(Arrays.asList(tableTitleList));

  for (int i = 0; i < 10;) {
    List < String > dataLine = new ArrayList < > ();
    i++;
    for (int j = 0; j < tableTitleList.length; j++) {
      dataLine.add(tableTitleList[j] + " " + i);
    }
    data.add(dataLine);
  }

  return data;
}

This will return a set of data where the first record is a title row and the following 10 rows contain mock-up data. It is assumed that this is data you have.

Now when you want to render this data in a table, you do this:

Java

Table table = new Table(UnitValue.createPercentArray(8)).useAllAvailableWidth();

List < List < String >> dataset = getData();
for (List < String > record: dataset) {
  for (String field: record) {
    table.addCell(new Cell().add(new Paragraph(field)));
  }
}

doc.add(table);

Note that we use Table and Cell classes, because PdfPTable and PdfPCell don't exist in iText 7. The result will look like this:

You can find the full source code here: ArrayToTable and this is the resulting PDF: array_to_table.pdf

If you only want 2 rows, a title row and a data row, change the following line:

Java

for (int i = 0; i < 10; ) {

Into this:

Java

for (int i = 0; i < 2; ) {

I've provided a more generic solution because it's more elegant to have generic code.

Click this link if you want to see how to answer this question in iText 5.