Removing whitespace from strings in Java

Question

I have a string like this:

mysz = \"name=john age=13 year=2001\";

I want to remove the whitespaces in the string. I tried trim()

Answer 1

mysz = mysz.replace(" ","");

First with space, second without space.

Then it is done.

Answer 2

When using st.replaceAll("\\s+","") in Kotlin, make sure you wrap "\\s+" with Regex:

"myString".replace(Regex("\\s+"), "")

Answer 3

If you prefer utility classes to regexes, there is a method trimAllWhitespace(String) in StringUtils in the Spring Framework.

Answer 4

Use mysz.replaceAll("\\s+","");

Answer 5

White space can remove using isWhitespace function from Character Class.

public static void main(String[] args) {
    String withSpace = "Remove white space from line";
    StringBuilder removeSpace = new StringBuilder();

    for (int i = 0; i<withSpace.length();i++){
        if(!Character.isWhitespace(withSpace.charAt(i))){
            removeSpace=removeSpace.append(withSpace.charAt(i));
        }
    }
    System.out.println(removeSpace);
}

Answer 6

public static void main(String[] args) {        
    String s = "name=john age=13 year=2001";
    String t = s.replaceAll(" ", "");
    System.out.println("s: " + s + ", t: " + t);
}

Output:
s: name=john age=13 year=2001, t: name=johnage=13year=2001