Java List Join join(final List list)

Description

Joins items of a text list, separating items by comma.

License

Open Source License

Parameter

Parameter	Description
list	list of text items

Return

joined list

Declaration

public static String join(final List<String> list) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.List;

public class Main {
    /**/*from ww  w.j  a  va2s .  c o  m*/
     * Joins items of a text list, separating items by comma.
     * 
     * @param list
     *            list of text items
     * @return joined list
     */
    public static String join(final List<String> list) {

        // zero, empty or one element
        if (list == null) {
            return null;
        } else if (list.size() == 0) {
            return "";
        } else if (list.size() == 1) {
            return list.get(0);
        }

        // two or more elements
        final StringBuilder builder = new StringBuilder();
        for (String item : list) {
            if (builder.length() > 0) {
                builder.append(", ");
            }
            builder.append(item);
        }
        return builder.toString();

    }

    /**
     * Joins items of a text array, separating items by comma.
     * 
     * @param list
     *            list of text items
     * @return joined list
     */
    public static String join(final String[] list) {

        // zero, empty or one element
        if (list == null) {
            return null;
        } else if (list.length == 0) {
            return "";
        } else if (list.length == 1) {
            return list[0];
        }

        // two or more elements
        final StringBuilder builder = new StringBuilder();
        for (String item : list) {
            if (builder.length() > 0) {
                builder.append(", ");
            }
            builder.append(item);
        }
        return builder.toString();

    }
}

Related

1. join(final List list, final String separator)
2. join(final List things, final String on)
3. join(final List