This sample demonstrates the sorting functionalities built in the Grid and Listbox components, saving developers from comparator implementations. Other then sorting alphabetically or numerically on entries, sorting can be made with respect to the fields in a POJO. In this demo, the first column is sorted with respect to the field "title", the second column is sorted by the field "lastname", while the last column is sorted against the Integer field "extension". For more detail on this feature (also build-in in Listbox Component), please consult ZK Component Reference - Listbox.

<div apply="demo.grid.auto_sort.AutoSortController">
	<grid width="100%" model="${$composer.allContributor}">
		<auxhead>
			<auxheader colspan="3" class="topic">Contributor List</auxheader>
		</auxhead>
		<columns>
			<column label="Title (Sort Alphabetically)" width="180px" align="center"
				sort="auto(Title)" />
			<column label="Full Name (Sort Alphabetically by First Name and Last Name)" align="center"
				sort="auto(firstName, lastName)" />
			<column label="Extension (Sort Numerically)" width="180px" align="center" 
				sort="auto(extension)" />
		</columns>
		<template name="model">
			<row>
				<label value="${each.title}" />
				<label value="${each.fullName}" />
				<label value="${each.extension}" />
			</row>
		</template>
	</grid>
</div>

package demo.grid.auto_sort;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.ListModelList;

import demo.data.ContributorData;
import demo.data.pojo.Contributor;

public class AutoSortController extends SelectorComposer<Component> {
	private static final long serialVersionUID = 1L;
	
	private final ListModel<Contributor> allContributor = 
			new ListModelList<Contributor>(new ContributorData().getContributors());
	
	public ListModel<Contributor> getAllContributor() {
		return allContributor;
	}
}

package demo.data.pojo;

import org.zkoss.bind.annotation.DependsOn;

public class Contributor {
	private String title;
	private String firstName;
	private String lastName;
	private Integer extension;

	public Contributor(String firstName, String lastName, String title, Integer ext) {
		setFirstName(firstName);
		setLastName(lastName);
		setTitle(title);
		setExtension(ext);
	}

	public Contributor() {
		setFirstName("");
		setLastName("");
		setTitle("Code");
		setExtension(12345);
	}

	public String getFirstName() {
		return firstName;
	}

	public void setFirstName(String fn) {
		firstName = fn;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String ln) {
		lastName = ln;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String tl) {
		title = tl;
	}

	public Integer getExtension() {
		return extension;
	}

	public void setExtension(Integer ext) {
		extension = ext;
	}

	@DependsOn({ "firstName", "lastName" })
	public String getFullName() {
		return getFirstName() + " " + getLastName();
	}
}

package demo.data;

import java.util.ArrayList;
import java.util.List;

import demo.data.pojo.Contributor;
import demo.data.pojo.LanguageContribution;

public class ContributorData {

	private List<String> titles = new ArrayList<String>();
	private List<Contributor> contributors = new ArrayList<Contributor>();
	private List<LanguageContribution> languageContributions = new ArrayList<LanguageContribution>();

	public ContributorData() {
		titles.add("Code");
		titles.add("Bug");
		titles.add("Docs");
		titles.add("Arts");

		contributors.add(new Contributor("Kaleb", "Leonel", titles.get(0).toString(), 321));
		contributors.add(new Contributor("Balu", "Haben", titles.get(0).toString(), 321));
		contributors.add(new Contributor("Trey", "Wyatt", titles.get(0).toString(), 323));
		contributors.add(new Contributor("Balu", "Chen", titles.get(0).toString(), 324));
		contributors.add(new Contributor("Terry", "Tornado", titles.get(0).toString(), 711));
		contributors.add(new Contributor("Jesse", "Miles", titles.get(1).toString(), 712));
		contributors.add(new Contributor("Sadira", "Jobs", titles.get(1).toString(), 713));
		contributors.add(new Contributor("Jaquan", "Frederick", titles.get(2).toString(), 451));
		contributors.add(new Contributor("Avery", "Katrina", titles.get(2).toString(), 453));
		contributors.add(new Contributor("Heidi", "Nikolas", titles.get(2).toString(), 455));
		contributors.add(new Contributor("Katelyn", "Clara", titles.get(2).toString(), 457));
		contributors.add(new Contributor("Branden", "Shane", titles.get(2).toString(), 459));
		contributors.add(new Contributor("Dacey", "Obert", titles.get(2).toString(), 450));
		contributors.add(new Contributor("Julianna", "Allison", titles.get(3).toString(), 643));
		contributors.add(new Contributor("Rachel", "Elisabeth", titles.get(3).toString(), 644));
		contributors.add(new Contributor("Clarissa", "Francesca", titles.get(3).toString(), 645));
		contributors.add(new Contributor("Gabby", "Taffy", titles.get(3).toString(), 646));
		
		languageContributions.add(new LanguageContribution("Arabic (ar)", "Ayman Elgharabawy", "iso-8859-6"));
		languageContributions.add(new LanguageContribution("Hungarian (hu)", "Andreas Klein", "iso-8859-2"));
		languageContributions.add(new LanguageContribution("Italian (it)", "Matteo Barbieri", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Indonesian (id)", "James Liam Supangkat", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Japanese (ja)", "Poli Lee", " iso-2022-jp"));
		languageContributions.add(new LanguageContribution("Korean (ko)", "Deok-su Lee", "euc-kr"));
		languageContributions.add(new LanguageContribution("Dutch (nl)", "Wido Jansen", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Portuguese (pt)", "Airton Carrara", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Brazilian Portugese (pt_BR)", "Airton Carrara", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Romanian (ro)", "Calin Vaida", "iso-8859-2"));
		languageContributions.add(new LanguageContribution("Russian (ru)", "Denis Yarkovoy", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("French (fr)", "Jêrôme Vergereau", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Spanish (es)", "Daniel Octavio Ruiz Rodriguez", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("German (de)", "H.-Dirk Schmitt", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Czech (cs)", "Pavel Mica", "iso-8859-2"));
		languageContributions.add(new LanguageContribution("Catalan (ca)", "Xavier Covas O'Ryan", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Bulgarian (bg) ", "Boril Yonchev", "iso-8859-5"));
		languageContributions.add(new LanguageContribution("Ukrainian (uk)", "Denis Yarkovoy", "iso-8859-5"));
		languageContributions.add(new LanguageContribution("Turkish (tr)", "Kursat Kurt", "iso-8859-9"));
		languageContributions.add(new LanguageContribution("Swedish (sv)", "Easit AB", "iso-8859-1"));
		languageContributions.add(new LanguageContribution("Slovenian (sl) ", "Ziga", "iso-8859-2"));
	}

	public List<String> getTitles() {
		return titles;
	}

	public List<Contributor> getContributors() {
		return contributors;
	}

	public List<LanguageContribution> getLanguageContributors() {
		return languageContributions;
	}

}