Terminal tables

package ext.hello;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

public class DrawTable {

	final String TAB = "    ";
	final String SPACE = " ";
	final String RT = "\n";
	final char NODE = '+';
	final char DASH = '-';
	final char SEP = '|';
	private String title = "";
	private String[] header = null;
	private List<List<String>> data = null;

	public DrawTable(String title, String[] header, List<List<String>> data) {
		this.data = data;
		this.header = header;
		this.title = title;
	}

	public String draw() {
		StringBuffer sb = new StringBuffer();
		StringBuffer sb1 = new StringBuffer();
		StringBuffer bottom = new StringBuffer();
		int COL = header.length;
		Map<Integer, List<String>> dataRowMap = new HashMap<>();
		int[][] colHWPair = new int[COL][2];
		preHeaderWidth(COL, dataRowMap, colHWPair);
		writeHeader(sb, sb1, bottom, COL, colHWPair);
		writeRecord(sb, bottom, COL, colHWPair);
		return sb.toString();
	}

	private void writeRecord(StringBuffer sb, StringBuffer bottom, int COL, int[][] colHWPair) {
		StringBuffer sb1;
		for (List<String> rec : data) {
			sb1 = new StringBuffer();
			sb1.append(SEP);
			for (int i = 0; i < COL; i++) {
				int[] pair = colHWPair[i];
				String d = rec.get(i);
				sb1.append(d);
				for (int j = d.length(); j < pair[0]; j++) {
					sb1.append(SPACE);
				}
				sb1.append(SEP);
			}
			sb1.append(RT).append(bottom.toString()).append(RT);
			sb.append(sb1.toString());
		}
	}

	private void writeHeader(StringBuffer sb, StringBuffer sb1, StringBuffer bottom, int COL, int[][] colHWPair) {
		bottom.append(NODE);
		sb1.append(SEP);
		for (int i = 0; i < COL; i++) {
			// Write Dash
			int[] pair = colHWPair[i];
			for (int j = 0; j < pair[0]; j++) {
				bottom.append(DASH);
			}
			bottom.append(NODE);
			sb1.append(header[i]);
			for (int j = header[i].length(); j < pair[0]; j++) {
				sb1.append(SPACE);
			}
			sb1.append(SEP);
		}
		sb.append(bottom.toString()).append('\n').append(sb1.toString()).append('\n').append(bottom.toString())
		  .append(RT);
	}

	private void preHeaderWidth(int COL, Map<Integer, List<String>> dataRowMap, int[][] colHWPair) {
		for (int i = 0; i < COL; i++) {
			String head = header[i];
			List<String> dataListCol = dataRowMap.get(i);
			if (dataListCol == null) {
				dataListCol = new ArrayList<>();
				dataRowMap.put(i, dataListCol);
			}
			colHWPair[i][0] = head.length();
			colHWPair[i][1] = 1;
			for (List<String> dataRec : data) {
				String colData = dataRec.get(i);
				int w = 0;
				int h = 0;
				if (!(colData == null || "".equals(colData))) {
					int size = colData.length();
					w = size;
					h = 1;
				}
				colHWPair[i][0] = w > colHWPair[i][0] ? w : colHWPair[i][0];
				colHWPair[i][1] = h > colHWPair[i][1] ? w : colHWPair[i][1];
				dataListCol.add(colData);
			}
		}
	}

    public static List<List<String>> fileReader(String file) {
        List<List<String>> data = new ArrayList<>();
        BufferedReader fileIn = null;
        try {
            fileIn = new BufferedReader(new FileReader(file));
            while (true) {
                String lineData = fileIn.readLine();
                if (lineData == null) {
                    break;
                }
                String[] colData = lineData.split(",");
                List<String> colDataList = new ArrayList<>();
                data.add(colDataList);
                for (String col : colData) {
                    colDataList.add(col);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fileIn.close();
            } catch (IOException e) {
            }
        }
        return data;
    }


    public static void main(String[] args) {
        String title = "HelloWorld";
        String fName = "C:\\Users\\shyuan\\temp\\data.csv";
        List<List<String>> data = fileReader(fName);
        String[] header = data.get(0).toArray(new String[]{});
        data.remove(0);
        System.out.println(new DrawTable(title, header, data).draw());

    }

}