Joins elements of a List into a String, separated by specified separator - Java java.lang

Java examples for java.lang:String Join

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Description

Joins elements of a List into a String, separated by specified separator

Demo Code


//package com.java2s;

import java.util.Iterator;

public class Main {
    /**//from   w  ww . j av  a  2 s  . co m
     * Joins elements of a List into a String, separated by specified separator
     * @param pieces List to join, e.g. ArrayList<String>(Arrays.asList("a", "b"))
     * @param separator String to separate elements of list, e.g. ", "
     * @return String of list elements joined by separator, e.g. "a, b"
     */
    public static String join(Iterable<?> pieces, String separator) {
        Iterator<?> i = pieces.iterator();
        if (!i.hasNext())
            return "";
        StringBuilder buf = new StringBuilder();
        buf.append(String.valueOf(i.next()).trim()); // We already know that size > 1
        while (i.hasNext()) {
            buf.append(separator).append(String.valueOf(i.next()));
        }
        return buf.toString();
    }

    /**
     * Converts List<String> to String, joining with spaces
     * @param pieces List<String> to convert
     * @return String containing all items in arrayList
     */
    public static String join(Iterable<?> pieces) {
        return join(pieces, " ");
    }
}

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