Java List Join JoinToString(List list, String delimiter)

Description

Given a List and a delimiter, creates a delimited string of the objects in the List (using the toString() method of each object).

License

Open Source License

Parameter

Parameter	Description
list	List of objects
delimiter	Delimiter to separate the objects in the output String

Return

Delimited String of the objects in the List

Declaration

public static String JoinToString(List<?> list, String delimiter) 

Method Source Code

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

import java.util.List;
import java.util.Set;

public class Main {
    /**//from  ww w  .  ja  v a 2s.c om
     * <p>Given a List and a delimiter, creates a delimited string of the objects
     * in the List (using the toString() method of each object).</p>
     * 
     * @param list List of objects
     * @param delimiter Delimiter to separate the objects in the output String
     * @return Delimited String of the objects in the List
     */
    public static String JoinToString(List<?> list, String delimiter) {
        return JoinToString(list, delimiter, false, null);
    }

    /**
     * <p>Given a List and a delimiter, creates a delimited string of the objects
     * in the List (using the toString() method of each object).</p>
     * 
     * @param list List of objects
     * @param delimiter Delimiter to separate the objects in the output String
     * @param escapeDelimiter If true, delimiters in the original strings will be escaped with escapeSequence
     * @param escapeSequence String to escape delimiters with
     * @return Delimited String of the objects in the List
     */
    public static String JoinToString(List<?> list, String delimiter, Boolean escapeDelimiter,
            String escapeSequence) {
        String ret = "";

        if (list == null) {
            return ret;
        }
        if (delimiter == null) {
            delimiter = "";
        }

        for (int listIdx = 0; listIdx < list.size(); listIdx++) {
            Object o = list.get(listIdx);

            if (listIdx != 0) {
                ret += delimiter;
            }

            String orig = o.toString();
            if (escapeDelimiter) {
                StringBuffer sb = new StringBuffer();

                int windowStart = 0;
                int windowLength = delimiter.length();
                int windowEnd = windowStart + windowLength;

                while (windowEnd <= orig.length()) {
                    String window = orig.substring(windowStart, windowEnd);
                    if (delimiter.equals(window)) {
                        sb.append(escapeSequence);
                        sb.append(window);

                        windowStart = windowEnd;
                        windowEnd = windowStart + windowLength;
                    } else {
                        String charAt = orig.substring(windowStart, windowStart + 1);
                        sb.append(charAt);

                        windowStart = windowStart + 1;
                        windowEnd = windowStart + windowLength;
                    }
                }
                if (windowStart < orig.length()) {
                    sb.append(orig.substring(windowStart, orig.length()));
                }

                ret += sb.toString();
            } else {
                ret += o.toString();
            }
        }

        return ret;
    }

    /**
     * <p>Given a Set and a delimiter, creates a delimited string of the objects
     * in the Set (using the toString() method of each object).</p>
     * 
     * @param set Set of objects
     * @param delimiter Delimiter to separate the objects in the output String
     * @return Delimited String of the objects in the Set
     */
    public static String JoinToString(Set<?> set, String delimiter) {
        return JoinToString(set, delimiter, false, null);
    }

    /**
     * <p>Given a Set and a delimiter, creates a delimited string of the objects
     * in the Set (using the toString() method of each object).</p>
     * 
     * @param set Set of objects
     * @param delimiter Delimiter to separate the objects in the output String
     * @param escapeDelimiter If true, delimiters in the original strings will be escaped with escapeSequence
     * @param escapeSequence String to escape delimiters with
     * @return Delimited String of the objects in the Set
     */
    public static String JoinToString(Set<?> set, String delimiter, Boolean escapeDelimiter,
            String escapeSequence) {
        String ret = "";

        if (set == null) {
            return ret;
        }
        if (delimiter == null) {
            delimiter = "";
        }

        Boolean start = true;
        for (Object o : set) {
            if (start) {
                start = false;
            } else {
                ret += delimiter;
            }

            String orig = o.toString();
            if (escapeDelimiter) {
                StringBuffer sb = new StringBuffer();

                int windowStart = 0;
                int windowLength = delimiter.length();
                int windowEnd = windowStart + windowLength;

                while (windowEnd <= orig.length()) {
                    String window = orig.substring(windowStart, windowEnd);
                    if (delimiter.equals(window)) {
                        sb.append(escapeSequence);
                        sb.append(window);

                        windowStart = windowEnd;
                        windowEnd = windowStart + windowLength;
                    } else {
                        String charAt = orig.substring(windowStart, windowStart + 1);
                        sb.append(charAt);

                        windowStart = windowStart + 1;
                        windowEnd = windowStart + windowLength;
                    }
                }
                if (windowStart < orig.length()) {
                    sb.append(orig.substring(windowStart, orig.length()));
                }

                ret += sb.toString();
            } else {
                ret += o.toString();
            }
        }

        return ret;
    }
}

Related

1. joinStrings(String joiner, List objects)
2. joinTextWithCommas(List list)
3. joinThreads(List threads)
4. joinTokens(final List tokens)
5. joinToString(List list)
6. joinUnique(List list, T element)
7. joinWordList(List wordList, String delimiter)
8. listToStr(List list, String joinChar)
9. listToText(List list, String join)