StringUtils.java

package com.transitwidget.utils;

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

public class StringUtils {
	private StringUtils() { }

	public static String join(String[] strings, String delimiter, String wrapper) {
	     StringBuilder builder = new StringBuilder();
	     for (int i = 0, l = strings.length; i < l; i++) {
	    	 if (wrapper != null) {
	    		 builder.append(wrapper);
	    	 }
	    	 builder.append(strings[i]);
	    	 if (wrapper != null) {
	    		 builder.append(wrapper);
	    	 }
	         if (i == l-1) {
	           break;                  
	         }
	         builder.append(delimiter);
	     }
	     return builder.toString();		
	}
	
	public static String join(Collection<?> s, String delimiter) {
	     StringBuilder builder = new StringBuilder();
	     Iterator<?> iter = s.iterator();
	     while (iter.hasNext()) {
	         builder.append(iter.next());
	         if (!iter.hasNext()) {
	           break;                  
	         }
	         builder.append(delimiter);
	     }
	     return builder.toString();
	 }

	
	public static String join(String[] strings, String delimiter) {
		return join(strings, delimiter, null);
	}
}