How to add or insert ' (single quotes) for every string in a list in which strings are separated by commas using Java

Question

I have a list as below

[url1,url2,url3,url4] 

This list will be based on multiple selection from drop down list of HTML. So list size i.e., lis

Answer 1

You can use Java 8 utility class java.util.StringJoiner.

This class specifically introduced to format list of string values.

For example:

StringJoiner joiner = new StringJoiner("','", "'", "'");
        joiner.add("url1");
        joiner.add("url2");
        joiner.add("url3");
        joiner.add("url4");
        System.out.println(joiner);

Output

'url1','url2','url3','url4'

Note that, in constructor of StringJoiner,

StringJoiner(CharSequence delimiter, CharSequence prefix, CharSequence suffix)

we are passing single quote as prefix and suffix to satisfy your specific requirement.

Answer 2

Most fast and efficient way to do this

Ex.

ArrayList<String> a=[url1,url2,url3,url4];

String s  ="'"+a.toString().replace("[","").replace("]", "").replace(" ","").replace(",","','")+"'";

Answer 3

Have one Util.java file or if you already have all common util stuff then just add these static methods

for single quote

public static String singleQuote(String str) {
        return (str != null ? "'" + str + "'" : null);
}

for double quotes

public static String doubleQuotes(String str) {
        return (str != null ? "\"" + str + "\"" : null);
}

Answer 4

Using Java 8 Streams:

String[] array = {"url1", "url2", "url3", "url4"}

Stream.of(array).collect(Collectors.joining("','", "'", "'"));