How to remove line if variable is empty

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I am currently learning how to print a textarea with data inside, but am having trouble trying to think of a way to remove lines which have empty values

    String color1 = "";
    String color2 = "";
    String color3 = "";
    String color4 = "";
    String color5 = "";
    String color6 = "";
    String color7 = "";
    String color8 = "";
    int weight1 = 0;
    int weight2 = 0;
    int weight3 = 0;
    int weight4 = 0;
    int weight5 = 0;
    int weight6 = 0;
    int weight7 = 0;
    int weight8 = 0;


    TextArea.setText("COLOR\t\t:\t WEIGHT:" + 
            "\n=====================================\n" +
            color1 +"\t\t\t "+ weight1 + "\n" +
            color2 +"\t\t\t "+ weight2 + "\n" +
            color3 +"\t\t\t "+ weight3 + "\n" +
            color4 +"\t\t\t "+ weight4 + "\n" +
            color5 +"\t\t\t "+ weight5 + "\n" +
            color6 +"\t\t\t "+ weight6 + "\n" +
            color7 +"\t\t\t "+ weight7 + "\n" +
            color8 +"\t\t\t "+ weight8 );
}

Usually, only color1 & color2 with their weights have a value, very rarely does it reach color8. Although color8 & its weight does not have a value how can I make sure it is not displayed in the textarea only if it has a value?

You can store colors and weights in a LinkedHashMap but only insert the values that have a weight assigned. You can then convert entries into a String:

LinkedHashMap<String, Integer> map = new LinkedHashMap<>();
map.put("white", 2);
map.put("red", 1);

String text = map.entrySet()
                 .stream()
                 .map(e -> e.getKey() + "\t\t\t " + e.getValue() + "\n")
                 .collect(Collectors.joining());
System.out.println(text);

Topic: Remove line where empty variable was, I'm trying to get it to remove the empty lines if address5 or address4 is an empty string. So far my code looks like the below but it doesn't seem  If the line is a comment line or a whitespace line, i want it to do nothing. If it notices parentheses, i want it to assume it is a Vector3 and parse it. Finally, if it is a line that is none of these, i want it to stop entirely.

I suppose that you should have an array of values and use a method like the following where you check if there exists a color, if yes then add to the output.

int index=0;
StringBuilder result=new StringBuilder();
while(index<colors.length && Strings.isNotEmpty(colors[index]){
   result.append(colors[index]);
   result.append(DELIMITER); // \t\t\t 
   result.append(weights[index]);
   result.append("\n");
}
return result;

How to delete empty lines using sed command under Linux / UNIX , How do I delete a directory in Linux terminal? BASH: Prepend A Text / Lines To a File · Linux / UNIX: Check If File Is Empty Or Not Using  You can pass the -z option to the if command or conditional expression. If the length of STRING is zero, variable ($var) is empty. The test command is used to check file types and compare values. This page shows how to find out if a bash shell variable is empty or not using the test command.

If you don't want to use arrays for the colors, you can check if each color is an empty string:

TextArea.setText("COLOR\t\t:\t WEIGHT:" + 
            "\n=====================================\n" +
            !color1.equals("")?color1 +"\t\t\t "+ weight1 + "\n" +:"";
            !color2.equals("")?color2 +"\t\t\t "+ weight2 + "\n" +:"";
            !color3.equals("")?color3 +"\t\t\t "+ weight3 + "\n" +:"";
            !color4.equals("")?color4 +"\t\t\t "+ weight4 + "\n" +:"";
            !color5.equals("")?color5 +"\t\t\t "+ weight5 + "\n" +:"";
            !color6.equals("")?color6 +"\t\t\t "+ weight6 + "\n" +:"";
            !color7.equals("")?color7 +"\t\t\t "+ weight7 + "\n" +:"";
            !color8.equals("")?color8 +"\t\t\t "+ weight8:""; );

Howto: Linux command line utilities for removing blank lines from , Both grep and sed use special pattern ^$ that matchs the blank lines. Grep -v option Use following for loop (shell script) to remove all blank lines from all files stored in /home/me/data directory: if you want to assign to a variable then use Checking variable empty or not in Python. Now let’s first understand a little bit about these sequences. LISTS – Check empty or not.

public static void main(String[] args) {
            String color1 = "";
            String color2 = "";
            String color3 = "";
            String color4 = "";
            String color5 = "";
            String color6 = "";
            String color7 = "";
            String color8 = "";
            int weight1 = 0;
            int weight2 = 0;
            int weight3 = 0;
            int weight4 = 0;
            int weight5 = 0;
            int weight6 = 0;
            int weight7 = 0;
            int weight8 = 0;

            List<String> colors= Arrays.asList(color1, color2 , color3 , color4 , color5 , color6 , color7 , color8);
            List<String> colors2=  colors.stream().filter(p -> colors.isEmpty()).collect(Collectors.toList());

            List<Integer> weights = Arrays.asList(weight1, weight2, weight3, weight4, weight5, weight6, weight7, weight8);

            stamp(colors2,weights);

    }

   private static void  stamp (List<String> colors, List<Integer> weights) {


       String header ="COLOR\t\t:\t WEIGHT:" + 
            "\n=====================================\n";

       String row = "";
       int i = 0;
       for (String color : colors) {
           row = row + color +"\t\t\t "+ weights.get(i)+ "\n";
           i++;
       }
        System.out.println(header+row);
   }

How to remove empty lines from begin and end of file?, n N -> Add a newline to the pattern space, then append the next line of input to the pattern space. If there is no more input then sed exits without  The last scenario you may want to test is your variable has a value, it isn’t null or an empty string, but the “value” only consists of spaces. For example, you may have a CSV file that the author accidentally entered a space in a column for which they didn’t intend to enter a value.

Try this way

List<String> colors = new ArrayList<>();
List<Integer> weights = new ArrayList<>();

String text = "COLOR\t\t:\t WEIGHT:" + 
          "\n=====================================";
if (!colors.isEmpty() && !weights.isEmpty()) {
  for (String color : colors) {
      if (weights.get(colors.indexOf(color) != null) {
         text = text + "\n" + color +"\t\t\t "+ weights.get(colors.indexOf(color));
      }
  }
}

TextArea.setText(text);

How to remove empty/blank lines from a file in Unix (including , Remove completely blank lines (including lines with spaces). grep "\S" file.txt. Note: If you get unwanted colors, that means your grep is aliases to grep  In this example, we will test whether cell A1 is empty. If cell A1 is empty, the message "Cell A1 is empty" will be displayed. With a Variable. The ISEMPTY function can also be used to test whether a variable has been initialized. If the variable has not been initialized, the ISEMPTY function will return true.

[PDF] 12 Deleting variables and observations, In this chapter, we will present the tools for paring observations and variables from a dataset. We saw how an empty dataset. What you If you type the command clear into the Command window, it will remove all variables and value labels. Select the range where you want to delete empty lines. Go to the Data tab > Get & Transform group and click From Table/Range. This will load your table to the Power Query Editor. On the Home tab of the Power Query Editor, click Remove Rows > Remove Blank Rows.

Solved: Removing blank lines, NORMAL SCHEDULE. When I try to remove the blank line. replace(body('​Html_to_text'),variables('txtCR'),'') //txtCR is just a variable with a line break. I get this:. How to check whether a variable is empty in PHP. Topic: PHP / MySQL Prev|Next. Answer: Use the PHP empty() function. You can use the PHP empty() function to find out whether a variable is empty or not. A variable is considered empty if it does not exist or if its value equals FALSE.

Korn Shell / Ksh: Essential Programs for Your Survival at Work, , The number of arguments (from command line) is stored in variable n" print "​The following EXAMPLE shows how to remove ALL blank lines:" print '. on the command line, # and user did NOT put a file name on the command line. if [[ ! As a result, the value of the variable is NULL (empty). If the variable has a specified data or object type, this cmdlet preserves the type of the object stored in the variable. Examples. Example 1: Remove the value of global variables that begin with a search string. PS C:\> Clear-Variable my* -Scope Global

Comments
  • first of all use arrays (and avoid color1...8) and if color and weight are related one to the other then maybe it is an object.
  • then you cannot repeat colours as you are using them as a key.
  • You probably want to increment the index somewhere, currently it stays at 0