Develop Reference

Replace blank spaces from arguments to run command

I'm using Runtime.getRuntime.exec(String) to cut some songs with ffmpeg.
But when my song has a name with a blankspace it doesn't work ...
So before I cut the song, I want to replace every blank space of my songs by "\ ".
I did that :
String in = directory+songs.get(i);
String out = directory+"trimed_"+songs.get(i);
in.replaceAll(" "," \\ ");
out.replaceAll(" ", "\\ ");
String str = "ffmpeg -t 1 -i "+in+" -vcodec copy "+out;
Runtime.getRuntime().exec(str);
But it doesn't replace anything at all when I print str, am I missing something ?
Update : I tried every ideas given bellow and I didn't find a way to fix the problem. Hence, I replaced the blankspaces by "_" and it's working great.

Try
String in = directory+songs.get(i);
String out = directory+"trimed_"+songs.get(i);
/* in = in.replaceAll("\\s","\\\\ ");
out = out.replaceAll("\\s","\\\\ ");
*/
in = "\"" + in + "\"";
out = "\"" + out + "\"";
String str = "ffmpeg -t 1 -i " + in + " -vcodec copy " + out;
Runtime.getRuntime().exec(str);
System.out.println("Command executed " + str);
Note: I tested this code myself its working fine.
If it still not working then execute the command manually by copying the str from log and trace the error

The "+" operator is not working in my code

It's so weird that the String + operation has a bug:
String path = "/app/" + monPHost.getUsername() + "/app/" + monProcessInfo.getRegion() + "/tf/bin";
System.out.println("here it ...." + path);
This is the result:
here it ..../app/aiams/app/791
Where has the "/tf/bin" gone?

Maybe monProcessInfo.getRegion() is ending with a carriage return. Try to pre-process it, strip it, and the concatenate with your string.
OR, try this:
String path = "/app/" + monPHost.getUsername() + "/app/" + monProcessInfo.getRegion();
path = path + "/tf/bin";
System.out.println("here it ...." + path);

As a quick work around for all the spaces you're getting:
String path = "/app/" + monPHost.getUsername() + "/app/" + monProcessInfo.getRegion().trim() + "/tf/bin";
System.out.println("here it ...." + path);
I recommend tracking this down in your process object and fixing it there, if you only ever expect an Integer result try to return one, failing fast & early can prevent a lot of downstream bugs.

Given in comment you mentioned monProcessInfo.getRegion() is giving you a String with lots of spaces, and you haven't mentioned the type of return for this method, here is what you may do:
If it is returning a String:
It will be as easy as
String path = "...." + monProcessInfo.getRegion().trim() + "/tf/bin";
If it is returning something else:
Given String concat in Java is relying on Object.toString(), you can change it to:
String path = "...." + monProcessInfo.getRegion().toString().trim() + "/tf/bin";

Since you mentioned that monProcessInfo.getRegion() returns lots of spaces, you can try trimming it before appending it to the later part of the string.
StringBuilder sb = new StringBuilder();
sb.append("/app/" + monPHost.getUsername() + "/app/");
String region = ("" + monProcessInfo.getRegion()).trim();
sb.append(region + "/tf/bin");
System.out.println("here it ...." + sb.toString());

Univocity Parsers: Calling a function from here is not working: parserSettings.selectFields( *some_function* );

I am using a .csv file and would like to pass a string constructed by a function to: parserSettings.selectFields( function );
During testing, when the string returned by the function is pasted directly into: parserSettings.selectFields( string ); the parsing works fine, however, when the function is used instead, the parse doesn't work, and there is only output of whitespace.
Here is the function:
public String buildColList() {
//Parse the qty col names string, which is a comma separated string
String qtyString = getQtyString();
List<String> qtyCols = Arrays.asList(qtyString.split("\\s*,\\s*"));
String colString = StringUtils.join(qtyCols.toArray(), "\"" + ", " + "\"");
String fullColString;
fullColString = "\"" + getString1() + "\"" + ", " + "\"" + getString2() + "\"" + ", " + "\"" + colString + "\"" + ", " + "\"" + getString4 + "\"";
return fullColString;
}
Here is how it is placed:
parserSettings.selectFields(buildColList());
Any help would be greatly appreciated, thanks.

You need to return an array from your buildColList method, as the parserSettings.selectFields() method won't split a single string. Your current implementation is selecting a single, big header instead of multiple columns. Change your method to do something like this:
public String[] buildColList() {
//Parse the qty col names string, which is a comma separated string
String qtyString = getQtyString();
List<String> qtyCols = Arrays.asList(qtyString.split("\\s*,\\s*"));
String colString = StringUtils.join(qtyCols.toArray(), "\"" + ", " + "\"");
String[] fullColString = new String[]{getString1(), getString2(), colString, getString4};
return fullColString;
}
And it should work. You might need to adjust my solution to fit your particular scenario as I didn't run this code. Also, I'm not sure why you were appending quotes around the column names, so I removed them.
Hope this helps.

Digits are getting deleted when splitting a string

I have a string from which I need to remove all mentioned punctuations and spaces. My code looks as follows:
String s = "s[film] fever(normal) curse;";
String[] spart = s.split("[,/?:;\\[\\]\"{}()\\-_+*=|<>!`~##$%^&\\s+]");
System.out.println("spart[0]: " + spart[0]);
System.out.println("spart[1]: " + spart[1]);
System.out.println("spart[2]: " + spart[2]);
System.out.println("spart[3]: " + spart[3]);
I have a string from which I need to remove all mentioned punctuations and spaces. My code looks as follows:
String s = "s[film] fever(normal) curse;";
String[] spart = s.split("[,/?:;\\[\\]\"{}()\\-_+*=|<>!`~##$%^&\\s+]");
System.out.println("spart[0]: " + spart[0]);
System.out.println("spart[1]: " + spart[1]);
System.out.println("spart[2]: " + spart[2]);
System.out.println("spart[3]: " + spart[3]);
But, I am getting some elements which are blank. The output is:
spart[0]: s
spart[1]: film
spart[2]:
spart[3]: normal

- is a special character in PHP character classes. For instance, [a-z] matches all chars from a to z inclusive. Note that you've got )-_ in your regex.

- defines a range in regular expressions as used by String.split argument so that needs to be escaped
String[] part = line.toLowerCase().split("[,/?:;\"{}()\\-_+*=|<>!`~##$%^&]");

String[] spart = s.split("[,/?:;\\[\\]\"{}()\\-_+*=|<>!`~##$%^&\\s]+");

"missing ) after argument list" [duplicate]

I want to initialize a String in Java, but that string needs to include quotes; for example: "ROM". I tried doing:
String value = " "ROM" ";
but that doesn't work. How can I include "s within a string?

In Java, you can escape quotes with \:
String value = " \"ROM\" ";

In reference to your comment after Ian Henry's answer, I'm not quite 100% sure I understand what you are asking.
If it is about getting double quote marks added into a string, you can concatenate the double quotes into your string, for example:
String theFirst = "Java Programming";
String ROM = "\"" + theFirst + "\"";
Or, if you want to do it with one String variable, it would be:
String ROM = "Java Programming";
ROM = "\"" + ROM + "\"";
Of course, this actually replaces the original ROM, since Java Strings are immutable.
If you are wanting to do something like turn the variable name into a String, you can't do that in Java, AFAIK.

Not sure what language you're using (you didn't specify), but you should be able to "escape" the quotation mark character with a backslash: "\"ROM\""

\ = \\
" = \"
new line = \r\n OR \n\r OR \n (depends on OS) bun usualy \n enough.
taabulator = \t

Just escape the quotes:
String value = "\"ROM\"";

In Java, you can use char value with ":
char quotes ='"';
String strVar=quotes+"ROM"+quotes;

Here is full java example:-
public class QuoteInJava {
public static void main (String args[])
{
System.out.println ("If you need to 'quote' in Java");
System.out.println ("you can use single \' or double \" quote");
}
}
Here is Out PUT:-
If you need to 'quote' in Java
you can use single ' or double " quote

Look into this one ... call from anywhere you want.
public String setdoubleQuote(String myText) {
String quoteText = "";
if (!myText.isEmpty()) {
quoteText = "\"" + myText + "\"";
}
return quoteText;
}
apply double quotes to non empty dynamic string. Hope this is helpful.

This tiny java method will help you produce standard CSV text of a specific column.
public static String getStandardizedCsv(String columnText){
//contains line feed ?
boolean containsLineFeed = false;
if(columnText.contains("\n")){
containsLineFeed = true;
}
boolean containsCommas = false;
if(columnText.contains(",")){
containsCommas = true;
}
boolean containsDoubleQuotes = false;
if(columnText.contains("\"")){
containsDoubleQuotes = true;
}
columnText.replaceAll("\"", "\"\"");
if(containsLineFeed || containsCommas || containsDoubleQuotes){
columnText = "\"" + columnText + "\"";
}
return columnText;
}

suppose ROM is string variable which equals "strval"
you can simply do
String value= " \" "+ROM+" \" ";
it will be stored as
value= " "strval" ";