Convert String[] to comma separated string in java

Question

i have one String[]

String[] name = {\"amit\", \"rahul\", \"surya\"};

i want to send name as parameter in sql query inside IN

Answer 1

You can do this with one line of code:

Arrays.toString(strings).replaceAll("[\\[.\\].\\s+]", "");

Answer 2

i use this

public static String convertToCommaSeparated(String[] strings) {
    StringBuffer sb = new StringBuffer("");
    for (int i = 0; strings != null && i < strings.length; i++) {
        sb.append(strings[i]);
        if (i < strings.length - 1) {
            sb.append(',');
        }
    }
    return sb.toString();
}

Answer 3

USE StringUtils.join function: E.g.

String myCsvString = StringUtils.join(myList, ",")

Answer 4

You could also simplify it using the Guava library:

String[] name = {"amit", "rahul", "surya"};
String str = "'" + Joiner.on(",").skipNulls().join(name)
    .replace(",", "','") + "'";

Answer 5

String[] name = {"amit", "rahul", "surya"};


public static String arrayToString(String array[])
{
    if (array.length == 0) return "";
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < array.length; ++i)
    {
        sb.append(",'").append(array[i]).append("'");
    }
    return sb.substring(1);
}