How to trim white space from all elements in array

Question

I was just wondering what the best way to remove the white space from all the elements of a list would be   For example if I had   String    array      String    Tom Selleck     Fish    How could I get all the elements as   String   Tom Selleck   Fish    Thanks

User · Answer

Not knowing how the OP happened to have {" String", "Tom Selleck "," Fish "} in an array in the first place (6 years ago), I thought I'd share what I ended up with.

My array is the result of using split on a string which might have extra spaces around delimiters. My solution was to address this at the point of the split. My code follows. After testing, I put splitWithTrim() in my Utils class of my project. It handles my use case; you might want to consider what sorts of strings and delimiters you might encounter if you decide to use it.

public class Test {
    public static void main(String[] args) {
        test(" abc def  ghi   jkl ", " ");
        test("  abc; def  ;ghi  ; jkl; ", ";");
    }

    public static void test(String str, String splitOn) {
        System.out.println("Splitting \"" + str + "\" on \"" + splitOn + "\"");
        String[] parts = splitWithTrim(str, splitOn);
        for (String part : parts) {
            System.out.println("(" + part + ")");
        }
    }

    public static String[] splitWithTrim(String str, String splitOn) {
        if (splitOn.equals(" ")) {
            return str.trim().split(" +");
        } else {
            return str.trim().split(" *" + splitOn + " *");
        }
    }
}

Output of running the test application is:

Splitting " abc def  ghi   jkl " on " "
(abc)
(def)
(ghi)
(jkl)
Splitting "  abc; def  ;ghi  ; jkl; " on ";"
(abc)
(def)
(ghi)
(jkl)

User · Answer

I know this is a really old post  but since Java 1 8 there is a nicer way to trim every String in an array   Java 8 Lamda Expression solution   List lt String gt  temp   new ArrayList lt  gt  Arrays asList yourArray    temp forEach e - gt   temp set  temp indexOf e   e trim      yourArray   temp toArray new String temp size        with this solution you don t have to create a new Array   Like in   scar L  pez s solution

User · Answer

Add commons-lang3-3 1 jar in your application build path  Use the below code snippet to trim the String array   String array      String    Tom Selleck     Fish     array   StringUtils stripAll array

User · Answer

You can just iterate over the elements in the array and call array i  trim   on each element

User · Answer

Another java 8 lambda option     String   array2   Arrays stream array  map String  trim  toArray String    new     And the ugly but optimized version without new array creation  Arrays stream array  map String  trim  toArray unused - gt  array     Original  array  is modified

User · Answer

Try this   String   trimmedArray   new String array length   for  int i   0  i  lt  array length  i        trimmedArray i    array i  trim      Now trimmedArray contains the same strings as array  but without leading and trailing whitespace  Alternatively  you could write this for modifying the strings in-place in the same array   for  int i   0  i  lt  array length  i        array i    array i  trim

User · Answer

For those  like me  who was looking for the same solution in Kotlin and were pointed to Java only - how to trim in Kotlin  fun main args  Array lt String gt            array definition     val array   arrayListOf lt String gt   quot  String quot    quot Tom Selleck  quot   quot  Fish  quot       println array     print original - gt    String  Tom Selleck    Fish           remove leading and trailing spaces  result is arrayList     val sol1   array map   it trim         println  quot sol1    sol1 quot      - gt  sol1    String  Tom Selleck  Fish          remove leading and trailing spaces  result is String     val sol2   array joinToString   it trim         println  quot sol2    sol2 quot      - gt  sol2   String  Tom Selleck  Fish

User · Answer

String val    hi hello prince   String arr     val split        for  int i   0  i  lt  arr length  i              System out print arr i

User · Answer

In Java 8  Arrays parallelSetAll seems ready made for this purpose   import java util Arrays   Arrays parallelSetAll array   i  - gt  array i  trim       This will modify the original array in place  replacing each element with the result of the lambda expression

[java] How to trim white space from all elements in array?

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