Java Iterable Join join(Iterable array)

Description

join

License

Open Source License

Declaration

public static String join(Iterable<String> array) 

Method Source Code

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

import java.util.Iterator;

public class Main {
    public static String join(Iterable<String> array) {
        return join(array, ",");
    }// www.  j a v  a  2s .c  o m

    public static String join(Iterable<String> array, String delimiter) {
        if (array == null)
            return "";
        StringBuilder result = new StringBuilder();
        Iterator<String> it = array.iterator();
        boolean first = true;
        while (it.hasNext()) {
            if (first)
                first = false;
            else
                result.append(delimiter);
            result.append(it.next());
        }
        return result.toString();
    }

    public static String join(Object[] array) {
        return join(array, ",");
    }

    public static String join(Object[] array, String delimiter) {
        if (array == null)
            return "";
        // Cache the length of the delimiter
        // has the side effect of throwing a NullPointerException if
        // the delimiter is null.
        int delimiterLength = delimiter.length();
        // Nothing in the array return empty string
        // has the side effect of throwing a NullPointerException if
        // the array is null.
        if (array.length == 0) {
            return "";
        }
        // Only one thing in the array, return it.
        if (array.length == 1) {
            if (array[0] == null) {
                return "";
            }
            return array[0].toString();
        }
        // Make a pass through and determine the size
        // of the resulting string.
        int length = 0;
        for (int i = 0; i < array.length; i++) {
            if (array[i] != null) {
                length += array[i].toString().length();
            }
            if (i < array.length - 1) {
                length += delimiterLength;
            }
        }
        // Make a second pass through and concatenate everything
        // into a string buffer.
        StringBuilder result = new StringBuilder(length);
        for (int i = 0; i < array.length; i++) {
            if (array[i] != null) {
                result.append(array[i].toString());
            }
            if (i < array.length - 1) {
                result.append(delimiter);
            }
        }
        return result.toString();
    }
}

Related

1. join(Iterable objects)
2. join(Iterable objects, String delimiter)
3. join(Iterable parts, String delimiter)
4. join(Iterable target, String separator)
5. join(Iterable iterable, String separator)
6. join(Iterable items, String separator)
7. join(Iterable iterable, String delimiter)
8. join(Iterable s, String delimiter)
9. join(Iterable s, String delimiter)