Takes a collection and returns all elements assembled in a String joined by the defined separator. - Android java.util

Android examples for java.util:Collection Element

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Description

Takes a collection and returns all elements assembled in a String joined by the defined separator.

Demo Code


//package com.book2s;
import java.util.Collection;
import java.util.Iterator;

public class Main {
    public static void main(String[] argv) {
        Collection collection = java.util.Arrays.asList("asdf",
                "book2s.com");
        String separator = "book2s.com";
        System.out.println(join(collection, separator));
    }//from w w w .  jav a  2  s.  c  o  m

    /**
     * Takes a collection and returns all elements assembled in
     * a {@link String} joined by the defined separator.
     * <br>
     * Example: Create a {@link String} using a {@link List<Integer>}
     * separated by "\n":
     * <br>
     * <code>
     * List<Integer> list = new ArrayList<Integer>();
     * <br>
     * list.add(1);
     * <br>
     * list.add(2);
     * <br>
     * list.add(3);
     * <br>
     * String output = CollectionUtils.join(list, "\n");
     * <br>
     * </code>
     * 
     * @param collection a {@link Collection} of objects to join.
     * @param separator the {@link String} separator used to join the collection. 
     * @return {@link String} joined string.
     */
    public static String join(Collection<?> collection, String separator) {
        String output = "";
        if (collection != null) {
            Iterator<?> iterator = collection.iterator();
            while (iterator.hasNext()) {
                Object o = iterator.next();
                output += o;
                if (iterator.hasNext())
                    output += separator;
            }
        }
        return output;
    }

    /**
     * Takes an array of Objects and returns all elements assembled in
     * a {@link String} joined by the defined separator.
     * <br>
     * Example: Create a {@link String} using an {@link Integer[]}
     * separated by "\n":
     * <br>
     * <code>
     * Integer[] array = {1, 2, 3};
     * <br>
     * String output = CollectionUtils.join(array, "\n");
     * <br>
     * </code>
     * 
     * @param collection a {@link Collection} of objects to join.
     * @param separator the {@link String} separator used to join the collection. 
     * @return {@link String} joined string.
     */
    public static String join(Object[] collection, String separator) {
        String output = "";
        if (collection != null)
            for (int i = 0; i < collection.length - 1; i++) {
                Object o = collection[i];
                output += o;
                output += separator;
            }
        if (collection.length > 0)
            output += collection[collection.length - 1];
        return output;
    }
}

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