Java Collection Join join(Collection strings, String delimiter)

Description

Join string pieces and separate with a delimiter.

License

Apache License

Parameter

Parameter	Description
strings	String pieces to join
delimiter	Delimiter to put between string pieces

Return

One merged string

Declaration

public static String join(Collection<String> strings, String delimiter) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.*;

public class Main {
    /**//from w  w w  . jav a2  s .c o  m
     * Join string pieces and separate with a delimiter.  Similar to the perl function of
     * the same name.  If strings or delimiter are null, null is returned.  Otherwise, at
     * least an empty string will be returned.    
     * @see #split
     *
     * @param strings String pieces to join
     * @param delimiter Delimiter to put between string pieces
     * @return One merged string
     */
    public static String join(Collection<String> strings, String delimiter) {
        if (strings == null || delimiter == null) {
            return null;
        }

        StringBuffer str = new StringBuffer();

        Iterator<String> iter = strings.iterator();
        while (iter.hasNext()) {
            str.append(iter.next());
            if (iter.hasNext()) {
                str.append(delimiter);
            }
        }

        return str.toString();
    }

    /**
     * Return a stringified version of the array.
     * @param array the array
     * @param delim the delimiter to use between array components
     * @return the string form of the array
     */
    public static String toString(final Object[] array, final String delim) {
        return toString(array, delim, true);
    }

    /**
     * Return a stringified version of the array.
     * @param array the array
     * @param delim the delimiter to use between array components
     * @return the string form of the array
     */
    public static String toString(final Object[] array, final String delim, boolean includeBrackets) {
        if (array == null) {
            return ""; //$NON-NLS-1$
        }
        final StringBuffer sb = new StringBuffer();
        if (includeBrackets) {
            sb.append('[');
        }
        for (int i = 0; i < array.length; ++i) {
            if (i != 0) {
                sb.append(delim);
            }
            sb.append(array[i]);
        }
        if (includeBrackets) {
            sb.append(']');
        }
        return sb.toString();
    }

    /**
     * Return a stringified version of the array, using a ',' as a delimiter
     * @param array the array
     * @return the string form of the array
     * @see #toString(Object[], String)
     */
    public static String toString(final Object[] array) {
        return toString(array, ",", true); //$NON-NLS-1$
    }
}

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2. join(Collection strings, String delimiter)
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