从包含 Java 中的字符串的数组中删除空格

Question

So how can I remove a space(s) from an array of a string...

Taking an example, I have a string called list :

String[] list ={"Apple ", "Mel on", " Ice -cream ", Television"};

Can anyone please guide on what methods I should be using? I've already tried using .replace() .

Answer 1

For a single string:

String str = "look!   Spaces!  ";
System.out.println(str.replaceAll(" ","")); //Will print "look!Spaces!"

For an array:

String[] arr = ...
for (int i = 0; i < arr.length; i++) {
    arr[i] = arr[i].replaceAll(" ", "");
}

Or using Java 8 streams (although this one returns a List , not an array):

String[] arr = ...
List<String> l = Arrays.stream(arr).map(i -> i.replaceAll(" ", "")).collect(Collectors.toList());

Answer 2

Use trim() method

String s1="  hello string   ";  
System.out.println(s1.trim()); 

EDIT

trim() method only removes leading and trailing white spaces. If you want to remove spaces between words like Mel on , you can use replaceAll() method.

public static void main(String[] args) {

    String[] list ={"Apple ",  "Mel on", "  Ice -cream ", "Television"};

    for (int i = 0; i < list.length; i++) {
            list[i] = list[i].replaceAll(" ", "");
    }

    for (int i = 0; i < list.length; i++) {
           System.out.println(list[i]);
    }
}

Output

Apple
Melon
Ice-cream
Television