Replace certain string in array of strings

Question

let's say I have this string array in java

String[] test = {"hahaha lol", "jeng jeng jeng", "stack overflow"};

but now I want to replace all the whitespaces in the strings inside the array above to %20, to make it like this

String[] test = {"hahaha%20lol", "jeng%20jeng%20jeng", "stack%20overflow"};

How do I do it?

Coincident

Note that your question and its title diverge - your question is very specific, while the title is very general. My answer below goes into the question, not the title. – Keri

String.replace() ...examples to follow no doubt ;-) – Flittermouse

Answer 1

Iterate over the Array and replace each entry with its encoded version.

Like so, assuming that you are actually looking for URL-compatible Strings only:

for (int index =0; index < test.length; index++){
  test[index] = URLEncoder.encode(test[index], "UTF-8");
}

To conform to current Java, you have to specify the encoding - however, it should always be UTF-8.

If you want a more generic version, do what everyone else suggests:

for (int index =0; index < test.length; index++){
    test[index] = test[index].replace(" ", "%20");
}

Keri

Note that, annoyingly, URLEncoder.encode(str) is deprecated in favor of its overloaded form which takes the encoding type as a second argument (which should always be "UTF-8"). – Boxhaul

Answer 2

Here's a simple solution:

for (int i=0; i < test.length; i++) {
    test[i] = test[i].replaceAll(" ", "%20");
}

However, it looks like you're trying to escape these strings for use in a URL, in which case I suggest you look for a library which does it for you.

Rife

Look to my answer for that, it's part of the JDK. – Keri

Rush to answer a simple question and make simple mistakes :) – Rife

Also, see my comment on maerics' answer re: replace and replaceall. – Keri

Answer 3

Try using String#relaceAll(regex,replacement); untested, but this should work:

for (int i=0; i<test.length; i++) {
  test[i] = test[i].replaceAll(" ", "%20");
}

Boxhaul

Note that String#replace(target, replacement) should do the trick. replace does the same as replaceAll, but doesn't work with RegExes. – Keri

Answer 4

String[] test={"hahaha lol","jeng jeng jeng","stack overflow"};
                for (int i=0;i<test.length;i++) {
                    test[i]=test[i].replaceAll(" ", "%20");
                }

Staciastacie

Answer 5

for each String you would do a replaceAll("\\s", "%20")

Weizmann

Answer 6

Straight out of the Java docs... String java docs

You can do String.replace('toreplace','replacement').

Iterate through each member of the array with a for loop.

Maura

Answer 7

You can use IntStream instead. Code might look something like this:

String[] test = {"hahaha lol", "jeng jeng jeng", "stack overflow"};

IntStream.range(0, test.length).forEach(i ->
        // replace non-empty sequences
        // of whitespace characters
        test[i] = test[i].replaceAll("\\s+", "%20"));

System.out.println(Arrays.toString(test));
// [hahaha%20lol, jeng%20jeng%20jeng, stack%20overflow]

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^{See also: How to replace a whole string with another in an array}

Molest