Returns the single table map of String from 2-dimensions String array

getTableStr.java

// Returns the Table String from a String[][] data
public static String getTableStr (String[][] data) {
	// Calculate the maximum lengths of the each columns
	int[] len = new int[data[0].length];
	Arrays.fill(len, 0);
	for(String[] str: data) {
		for(int i = 0; i < str.length; i++ ) {
			String val = str[i];
			int stringLen = val == null ? 0 : val.length();
			if(stringLen > len[i]) len[i] = stringLen;
		}
	}
	// StringBuilder Ready
	StringBuilder sb = new StringBuilder();
	// Render headers
	String[] lis = data[0];
	for(int i = 0; i < lis.length; i++) {
		int printWidth = len[i] + 2;
		String val = lis[i];
		String printContent = String.format("%-" + printWidth + "s", val);
		sb.append(printContent);
		sb.append("\t");
	}
	sb.append('\n');
	// Render ==== s
	for(int i = 0; i < len.length; i++) {
		int l = len[i];
		sb.append(new String(new char[l]).replace("\0", "=")); // '='s
		sb.append(new String(new char[2]).replace("\0", " ")); // spaces
		sb.append("\t");
	}
	sb.append('\n');
	// Render the contents
	for(int i = 1; i < data.length; i++) {
		String[] row = data[i];
		for(int j = 0; j < row.length; j++) {
			int printWidth = len[j] + 1;
			String printContent = String.format("%-" + printWidth + "s", row[j]);
			sb.append(printContent);
			sb.append("\t");
		}
		sb.append('\n');
	}
	// Return the result
	return sb.toString();
}