implode a Collection to String with separator - Java java.lang

Java examples for java.lang:String Join

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Description

implode a Collection to String with separator

Demo Code


//package com.java2s;

import java.util.Collection;
import java.util.Iterator;

public class Main {
    public static void main(String[] argv) {
        Collection collection = java.util.Arrays.asList("asdf",
                "java2s.com");
        String separator = "@";
        System.out.println(implode(collection, separator));
    }/*from  w  ww  .j a va 2 s.c o m*/

    public static String implode(Collection collection, String separator) {
        if (collection == null)
            return null;
        if (collection.size() == 0)
            return "";

        Iterator iter = collection.iterator();
        StringBuffer result = new StringBuffer(iter.next().toString());

        while (iter.hasNext()) {
            if (separator != null)
                result.append(separator);
            result.append(iter.next().toString());
        }

        return result.toString();
    }

    public static String implode(Object[] array, String separator) {
        if (array == null)
            return null;
        if (array.length == 0)
            return "";

        StringBuffer result = new StringBuffer(array[0].toString());

        for (int i = 1; i < array.length; i++) {
            if (separator != null)
                result.append(separator);
            result.append(array[i].toString());
        }

        return result.toString();
    }
}

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