Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Iterator;

import java.util.Map;
import java.util.Map.Entry;

public class Main {
    public static final String EMPTY = "";

    /**
     * <p>
     * Joins the elements of the provided {@code Iterator} into a single String
     * containing the provided elements.
     * </p>
     * 
     * <p>
     * No delimiter is added before or after the list. Null objects or empty
     * strings within the iteration are represented by empty strings.
     * </p>
     * 
     * @param iterator
     *            the {@code Iterator} of values to join together, may be null
     * @param separator
     *            the separator character to use
     * @return the joined String, {@code null} if null iterator input
     */
    public static String join(Iterator<?> iterator, char separator) {
        if (iterator == null) {
            return null;
        }
        if (!iterator.hasNext()) {
            return EMPTY;
        }
        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first == null ? EMPTY : first.toString();
        }
        StringBuilder buf = new StringBuilder(256);
        if (first != null) {
            buf.append(first);
        }
        while (iterator.hasNext()) {
            buf.append(separator);
            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }
        return buf.toString();
    }

    public static String join(Map<?, ?> map, char separator, char valueStartChar, char valueEndChar) {

        if (map == null) {
            return null;
        }
        if (map.size() == 0) {
            return EMPTY;
        }
        StringBuilder buf = new StringBuilder(256);
        boolean isFirst = true;
        for (Entry<?, ?> entry : map.entrySet()) {
            if (isFirst) {
                buf.append(entry.getKey());
                buf.append(valueStartChar);
                buf.append(entry.getValue());
                buf.append(valueEndChar);
                isFirst = false;
            } else {
                buf.append(separator);
                buf.append(entry.getKey());
                buf.append(valueStartChar);
                buf.append(entry.getValue());
                buf.append(valueEndChar);
            }
        }

        return buf.toString();
    }
}