Checking value and displaying blank instead of null

Question

Hi,
I was wondering how do I check in the code if the value is null then display a blank as suppose to displaying the word null??
what I have now is:
column1 column2
24 null
want
24
I've tried:
if ("".equals(string))
out.println(" ");
if (string.equals(""))
if (string.equals(null))
thanks,
Will

Answer 1

Use s == null to test if the String s is null, then if yes, replace it with the blank string "". See the code bellow:
class MyString {
    String[][] sa={{"column1", "column2"},
             {"24", null},
             {"want", "24"},
    public String toString() {
     String result = "";
     for (int i=0; i < sa.length; i++) {
         for (int j=0; j < sa.length; j++) {
          if (sa[i][j] != null) {
          result += sa[i][j];
          else {
          result += "";
          result += "\t";
     result += "\n";
     return result;
public static void main(String[] args) {
     MyString ms = new MyString();
     System.out.println(ms.toString());