why it requires > API 19 its a simple check. The return statement inside a loop will cause the loop to break and further statements will be ignored by the compiler. Using Java Collections We can create an empty Map using the emptyMap () method provided by the Java Collections module. Customizing a Basic List of Figures Display. 2 Answers Sorted by: 1 Well you're creating a new JTextField within getfname: JTextField fname = new JTextField (80); fname.setBounds ( 100, 100, 150, 20 ); fname.setSize (200,30); return fname; What content would you expect that to have? A null string is a string that has no value. Does "critical chance" have any reason to exist? @Spring You should consider upgrading, especially with Java 8 coming out soon. Returning null, like in JDBC for field values, requires discipline by the user, and makes only sense in a context where more such "optional" data can be retrieved (= the null does not come unsuspected). How much space did the 68000 registers take up? Thank you for your valuable feedback! Characters with only one possible next character, A sci-fi prison break movie where multiple people die while trying to break out. If your question is whether you could refactor the code to return null instead of "", without knowing more about your code, I would say no. How to get Romex between two garage doors. Thanks for contributing an answer to Stack Overflow! How can I remove a mystery pipe in basement wall and floor? Note that here empty means the number of characters contained in a string is zero. What is the Modified Apollo option for a potential LEO transport? The Java String class isEmpty () method checks if the input string is empty or not. Isn't that Jon? Note that here empty means the number of characters contained in a string is zero. 47.5.2 Managing Users and Groups in GlassFish Server, 47.5.2.1 To Add Users to GlassFish Server, 47.6 Establishing a Secure Connection Using SSL, 47.6.1 Verifying and Configuring SSL Support, 48 Getting Started Securing Web Applications, 48.1 Overview of Web Application Security, 48.2.1.1 Specifying a Web Resource Collection, 48.2.1.2 Specifying an Authorization Constraint, 48.2.1.4 Specifying Security Constraints for Resources, 48.2.2 Specifying Authentication Mechanisms, 48.2.3 Specifying an Authentication Mechanism in the Deployment Descriptor, 48.3 Using Programmatic Security with Web Applications, 48.3.1 Authenticating Users Programmatically, 48.3.2 Checking Caller Identity Programmatically, 48.3.3 Example Code for Programmatic Security, 48.3.4 Declaring and Linking Role References, 48.4.1 To Set Up Your System for Running the Security Examples, 48.4.2 The hello2-basicauth Example: Basic Authentication with a Servlet, 48.4.2.1 Specifying Security for Basic Authentication Using Annotations, 48.4.2.2 To Build, Package, and Deploy the hello2-basicauth Example Using NetBeans IDE, 48.4.2.3 To Build, Package, and Deploy the hello2-basicauth Example Using Maven, 48.4.2.4 To Run the hello2-basicauth Example, 48.4.3 The hello1-formauth Example: Form-Based Authentication with a JavaServer Faces Application, 48.4.3.1 Creating the Login Form and the Error Page, 48.4.3.2 Specifying Security for the Form-Based Authentication Example, 48.4.3.3 To Build, Package, and Deploy the hello1-formauth Example Using NetBeans IDE, 48.4.3.4 To Build, Package, and Deploy the hello1-formauth Example Using Maven and the asadmin Command, 48.4.3.5 To Run the hello1-formauth Example, 49 Getting Started Securing Enterprise Applications, 49.1 Basic Security Tasks for Enterprise Applications, 49.2.1 Securing an Enterprise Bean Using Declarative Security, 49.2.1.1 Specifying Authorized Users by Declaring Security Roles, 49.2.1.2 Specifying an Authentication Mechanism and Secure Connection, 49.2.2 Securing an Enterprise Bean Programmatically, 49.2.2.1 Accessing an Enterprise Bean Caller's Security Context, 49.2.3 Propagating a Security Identity (Run-As), 49.2.3.1 Configuring a Component's Propagated Security Identity, 49.3.1 The cart-secure Example: Securing an Enterprise Bean with Declarative Security, 49.3.1.2 To Run the cart-secure Example Using NetBeans IDE, 49.3.1.3 To Run the cart-secure Example Using Maven, 49.3.2 The converter-secure Example: Securing an Enterprise Bean with Programmatic Security, 49.3.2.3 To Run the converter-secure Example Using NetBeans IDE, 49.3.2.4 To Run the converter-secure Example Using Maven, 49.3.2.5 To Run the converter-secure Example, 50.1.1.1 To Use keytool to Create a Server Certificate, 50.1.2 Adding Users to the Certificate Realm, 50.1.3 Using a Different Server Certificate with GlassFish Server, 50.1.3.1 To Specify a Different Server Certificate, 50.2.2.1 Enabling Mutual Authentication over SSL, 50.2.2.2 Creating a Client Certificate for Mutual Authentication, 50.3 Using the JDBC Realm for User Authentication, 50.3.1 To Configure a JDBC Authentication Realm, 50.6 Securing Enterprise Information Systems Applications, 50.6.3 Configuring Resource Adapter Security, 50.6.4 Mapping an Application Principal to EIS Principals, 50.7 Configuring Security Using Deployment Descriptors, 50.7.1 Specifying Security for Basic Authentication in the Deployment Descriptor, 50.7.2 Specifying Non-Default Principal-to-Role Mapping in the Deployment Descriptor, 50.8 Further Information about Advanced Security Topics, 51.1 Transactions in Java EE Applications, 51.3.1.7 Summary of Transaction Attributes, 51.3.2 Rolling Back a Container-Managed Transaction, 51.3.3 Synchronizing a Session Bean's Instance Variables, 51.3.4 Methods Not Allowed in Container-Managed Transactions, 51.4.3 Methods Not Allowed in Bean-Managed Transactions, 51.8 Further Information about Transactions, 52.4 Using Resource Adapters with Contexts and Dependency Injection for Java EE (CDI), 52.5 Further Information about Resource Adapters, 53.1.1 Using the Outbound Resource Adapter, 53.1.2 Implementing the Outbound Resource Adapter, 53.1.3.1 To Run the trading Example Using NetBeans IDE, 53.1.3.2 To Run the trading Example Using Maven, 53.2.1 Using the Inbound Resource Adapter, 53.2.2 Implementing the Inbound Resource Adapter, 53.2.3.1 To Run the traffic Example Using NetBeans IDE, 53.2.3.2 To Run the traffic Example Using Maven, 54.2.1.1 Using Multiple Method Interceptors, 54.2.1.2 Accessing Target Method Parameters from an Interceptor Class, 54.2.2 Intercepting Lifecycle Callback Events, 54.2.2.1 Using AroundConstruct Interceptor Methods, 54.2.2.2 Using Multiple Lifecycle Callback Interceptors, 54.2.3.1 Using Multiple Timeout Interceptors, 54.2.4 Binding Interceptors to Components, 54.2.4.1 Declaring the Interceptor Bindings on an Interceptor Class, 54.2.4.2 Binding a Component to an Interceptor, 54.3.1.1 To Run the interceptor Example Using NetBeans IDE, 54.3.1.2 To Run the interceptor Example Using Maven, 55.4 Using the Job Specification Language, 55.5.2 Dependency Injection in Batch Artifacts, 55.5.3 Using the Context Objects from the Batch Runtime, 55.6 Submitting Jobs to the Batch Runtime, 55.6.3 Invoking the Batch Runtime in Your Application, 55.8 The webserverlog Example Application, 55.8.1 Architecture of the webserverlog Example Application, 55.8.1.2 The LogLine and LogFilteredLine Items, 55.8.2 Running the webserverlog Example Application, 55.8.2.1 To Run the webserverlog Example Application Using NetBeans IDE, 55.8.2.2 To Run the webserverlog Example Application Using Maven, 55.9 The phonebilling Example Application, 55.9.1 Architecture of the phonebilling Example Application, 55.9.1.2 The CallRecord and PhoneBill Entities, 55.9.2 Running the phonebilling Example Application, 55.9.2.1 To Run the phonebilling Example Application Using NetBeans IDE, 55.9.2.2 To Run the phonebilling Example Application Using Maven, 55.10 Further Information about Batch Processing, 56.2 Main Components of the Concurrency Utilities, 56.5.1.1 To Configure GlassFish Server for the Basic Concurrency Example, 56.5.1.2 To Build, Package, and Deploy the jobs Example Using NetBeans IDE, 56.5.1.3 To Build, Package, and Deploy the jobs Example Using Maven, 56.5.1.4 To Run the jobs Example and Submit Jobs with Low Priority, 56.5.1.5 To Run the jobs Example and Submit Jobs with High Priority, 56.6.1.1 To Build, Package, and Deploy the taskcreator Example Using NetBeans IDE, 56.6.1.2 To Build, Package, and Deploy the taskcreator Example Using Maven, 56.7 Further Information about the Concurrency Utilities, 57.1 Design and Architecture of Duke's Bookstore, 57.2.1 The Book Java Persistence API Entity, 57.2.2 Enterprise Beans Used in Duke's Bookstore, 57.2.3 Facelets Pages and Managed Beans Used in Duke's Bookstore, 57.2.4 Custom Components and Other Custom Objects Used in Duke's Bookstore, 57.2.5 Properties Files Used in Duke's Bookstore, 57.2.6 Deployment Descriptors Used in Duke's Bookstore, 57.3 Running the Duke's Bookstore Case Study Application, 57.3.1 To Build and Deploy Duke's Bookstore Using NetBeans IDE, 57.3.2 To Build and Deploy Duke's Bookstore Using Maven, 58.1 Design and Architecture of Duke's Tutoring, 58.2.1 Java Persistence API Entities Used in the Main Interface, 58.2.2 Enterprise Beans Used in the Main Interface, 58.2.3 WebSocket Endpoint Used in the Main Interface, 58.2.4 Facelets Files Used in the Main Interface, 58.2.5 Helper Classes Used in the Main Interface, 58.2.7 Deployment Descriptors Used in Duke's Tutoring, 58.3.1 Enterprise Beans Used in the Administration Interface, 58.3.2 Facelets Files Used in the Administration Interface, 58.3.3 CDI Managed Beans Used in the Administration Interface, 58.3.4 Helper Classes Used in the Administration Interface, 58.4 Running the Duke's Tutoring Case Study Application, 58.4.1.1 To Build and Deploy Duke's Tutoring Using NetBeans IDE, 58.4.1.2 To Build and Deploy Duke's Tutoring Using Maven, 59.1 Design and Architecture of Duke's Forest, 59.1.5.1 Enterprise Beans Used in Duke's Store, 59.1.5.2 Facelets Files Used in the Main Interface of Duke's Store, 59.1.5.3 Facelets Files Used in the Administration Interface of Duke's Store, 59.1.5.4 Managed Beans Used in Duke's Store, 59.1.5.5 Helper Classes Used in Duke's Store, 59.1.5.7 Event Handlers Used in Duke's Store, 59.1.5.8 Deployment Descriptors Used in Duke's Store, 59.1.6.1 Enterprise Beans Used in Duke's Shipment, 59.1.6.2 Facelets Files Used in Duke's Shipment, 59.1.6.3 Managed Beans Used in Duke's Shipment, 59.1.6.4 Helper Class Used in Duke's Shipment, 59.1.6.5 Qualifier Used in Duke's Shipment, 59.1.6.6 Deployment Descriptors Used in Duke's Shipment, 59.2 Building and Deploying the Duke's Forest Case Study Application, 59.2.1 To Build and Deploy the Duke's Forest Application Using NetBeans IDE, 59.2.2 To Build and Deploy the Duke's Forest Application Using Maven, 59.3 Running the Duke's Forest Application, 59.3.1 To Register as a Duke's Store Customer. We can do this by annotating each field with @JsonInclude (Include.NON_NULL) annotation. @rolfl although you can put a breakpoint on the whole thing, and then step through it from there, if needed, or just stick a line break in. The isEmpty () method of the String class is included in Java string since JDK 1.6. Using Trie) Recommended: Please try your approach on {IDE} first, before moving on to the solution. In other words, you can say that this method returns true if the length of the string is 0. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Here is an example to confirm this: public class Book implements Comparable < Book > { private String title; @JsonInclude ( Include. Do you need an "Any" type when implementing a statically typed programming language? 2. It can be described as the absence of a string . Is a dropper post a good solution for sharing a bike between two riders? For example, the length of a string can be found with the length () method: Example String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.println("The length of the txt string is: " + txt.length()); Try it Yourself More String Methods Here, we can use the == operator to check for the null strings. It is a character sequence of zero characters. What does that mean? We understand that we can determine if a file is empty or not by checking the file's size. How to avoid returning a null value? Java String isEmpty() method with example - GeeksforGeeks I'm pretty sure you should go with bar(); Java.lang.String.isEmpty() String method checks whether a String is empty or not. StringUtils.defaultString(null) will return "" Java Strings - W3Schools Are there ethnically non-Chinese members of the CCP right now? An empty string is represented as "". Is it Really Better to 'Return an Empty List Instead of null'? / Part 1 Empty vs. Blank Of course, it's pretty common to know when a string is empty or blank, but let's make sure we're on the same page with our definitions. But, there is no performance benefit in the way you have done this. Thank you. Person FindPerson (int personID) // finds a Person with a matching personID. Mail us on h[emailprotected], to get more information about given services. 15.2.1 Why Use JavaServer Faces Technology to Implement an Image Map? The isEmpty() method of the String class is included in Java string since JDK 1.6. However, the same is true for a null string too. All rights reserved. For example, IntelliJ IDEA will generate a Allocation of zero-length array warning. How to convert a possible null-value to a default value using Guava? Checking for Empty or Blank Strings in Java | Baeldung 1. Consider the following example, in which the string testString is a bean variable that will be set using input entered by the user. An alternative approach is to use Apache Commons Lang 3 ArrayUtils.toArray() function with empty arguments: This approach is both performance and IDE friendly, yet requires a 3rd party dependency. 32.4.2 Deciding on Remote or Local Access, 32.4.3.1 Accessing Local Enterprise Beans Using the No-Interface View, 32.4.3.2 Accessing Local Enterprise Beans That Implement Business Interfaces, 32.6 Naming Conventions for Enterprise Beans, 32.7.1 The Lifecycle of a Stateful Session Bean, 32.7.2 The Lifecycle of a Stateless Session Bean, 32.7.3 The Lifecycle of a Singleton Session Bean, 32.7.4 The Lifecycle of a Message-Driven Bean, 32.8 Further Information about Enterprise Beans, 33.1.3.1 To Run the converter Example Using NetBeans IDE, 33.1.3.2 To Run the converter Example Using Maven, 34.1.5.1 To Run the cart Example Using NetBeans IDE, 34.1.5.2 To Run the cart Example Using Maven, 34.2 A Singleton Session Bean Example: counter, 34.2.1.1 Initializing Singleton Session Beans, 34.2.1.2 Managing Concurrent Access in a Singleton Session Bean, 34.2.1.3 Handling Errors in a Singleton Session Bean, 34.2.2 The Architecture of the counter Example, 34.2.3.1 To Run the counter Example Using NetBeans IDE, 34.2.3.2 To Run the counter Example Using Maven, 34.3.1 The Web Service Endpoint Implementation Class, 34.3.2 Stateless Session Bean Implementation Class, 34.3.3.1 To Build, Package, and Deploy the helloservice Example Using NetBeans IDE, 34.3.3.2 To Build, Package, and Deploy the helloservice Example Using Maven, 34.3.3.3 To Test the Service without a Client, 34.4.1 Creating Calendar-Based Timer Expressions, 34.4.1.1 Specifying Multiple Values in Calendar Expressions, 34.4.8.1 To Run the timersession Example Using NetBeans IDE, 34.4.8.2 To Build, Package, and Deploy the timersession Example Using Maven, 35 Using the Embedded Enterprise Bean Container, 35.1 Overview of the Embedded Enterprise Bean Container, 35.2 Developing Embeddable Enterprise Bean Applications, 35.2.2 Creating the Enterprise Bean Container, 35.2.2.1 Explicitly Specifying Enterprise Bean Modules to Be Initialized, 35.2.3 Looking Up Session Bean References, 35.2.4 Shutting Down the Enterprise Bean Container, 35.3.1 To Run the standalone Example Application Using NetBeans IDE, 35.3.2 To Run the standalone Example Application Using Maven, 36 Using Asynchronous Method Invocation in Session Beans, 36.1.1 Creating an Asynchronous Business Method, 36.1.2 Calling Asynchronous Methods from Enterprise Bean Clients, 36.1.2.1 Retrieving the Final Result from an Asynchronous Method Invocation, 36.1.2.2 Cancelling an Asynchronous Method Invocation, 36.1.2.3 Checking the Status of an Asynchronous Method Invocation, 36.2.1 Architecture of the async-war Module, 36.2.2.1 To Run the async Example Application Using NetBeans IDE, 36.2.2.2 To Run the async Example Application Using Maven, 37 Introduction to the Java Persistence API, 37.1.2 Persistent Fields and Properties in Entity Classes, 37.1.2.3 Using Collections in Entity Fields and Properties, 37.1.2.4 Validating Persistent Fields and Properties, 37.1.4 Multiplicity in Entity Relationships, 37.1.5.3 Queries and Relationship Direction, 37.1.5.4 Cascade Operations and Relationships, 37.2.4 Entity Inheritance Mapping Strategies, 37.2.4.1 The Single Table per Class Hierarchy Strategy, 37.2.4.2 The Table per Concrete Class Strategy, 37.3.1.1 Container-Managed Entity Managers, 37.3.1.2 Application-Managed Entity Managers, 37.3.1.3 Finding Entities Using the EntityManager, 37.3.1.4 Managing an Entity Instance's Lifecycle, 37.3.1.7 Synchronizing Entity Data to the Database, 37.5.1 Configuring an Application to Create or Drop Database Tables, 37.6 Further Information about Persistence, 38.1.1 Entity Relationships in the order Application, 38.1.1.3 One-to-Many Relationship Mapped to Overlapping Primary and Foreign Keys, 38.1.2 Primary Keys in the order Application, 38.1.3 Entity Mapped to More Than One Database Table, 38.1.4 Cascade Operations in the order Application, 38.1.5 BLOB and CLOB Database Types in the order Application, 38.1.6 Temporal Types in the order Application, 38.1.7 Managing the order Application's Entities, 38.1.8.1 To Run the order Example Using NetBeans IDE, 38.1.8.2 To Run the order Example Using Maven, 38.2.1 Relationships in the roster Application, 38.2.1.1 The Many-To-Many Relationship in roster, 38.2.2 Entity Inheritance in the roster Application, 38.2.3 Criteria Queries in the roster Application, 38.2.3.1 Metamodel Classes in the roster Application, 38.2.3.2 Obtaining a CriteriaBuilder Instance in RequestBean, 38.2.3.3 Creating Criteria Queries in RequestBean's Business Methods, 38.2.4 Automatic Table Generation in the roster Application, 38.2.5.1 To Run the roster Example Using NetBeans IDE, 38.2.5.2 To Run the roster Example Using Maven, 38.3.1 Bean Validation Constraints in address-book, 38.3.2 Specifying Error Messages for Constraints in address-book, 38.3.3 Validating Contact Input from a JavaServer Faces Application, 38.3.4.1 To Run the address-book Example Using NetBeans IDE, 38.3.4.2 To Run the address-book Example Using Maven, 39.2 Creating Queries Using the Java Persistence Query Language, 39.4.2 Queries That Navigate to Related Entities, 39.4.2.1 A Simple Query with Relationships, 39.4.2.2 Navigating to Single-Valued Relationship Fields, 39.4.2.3 Traversing Relationships with an Input Parameter, 39.4.2.4 Traversing Multiple Relationships, 39.4.2.5 Navigating According to Related Fields, 39.4.3 Queries with Other Conditional Expressions, 39.5.2 BNF Grammar of the Java Persistence Query Language, 39.5.5.9 Empty Collection Comparison Expressions, 40 Using the Criteria API to Create Queries, 40.1 Overview of the Criteria and Metamodel APIs, 40.2 Using the Metamodel API to Model Entity Classes, 40.3 Using the Criteria API and Metamodel API to Create Basic Typesafe Queries, 40.3.3 Querying Relationships Using Joins, 40.3.4 Path Navigation in Criteria Queries, 40.3.5 Restricting Criteria Query Results, 40.3.5.1 The Expression Interface Methods, 40.3.5.2 Expression Methods in the CriteriaBuilder Interface, 41 Creating and Using String-Based Criteria Queries, 41.1 Overview of String-Based Criteria API Queries, 42 Controlling Concurrent Access to Entity Data with Locking, 42.1 Overview of Entity Locking and Concurrency, 43 Creating Fetch Plans with Entity Graphs, 43.1.2 Using Entity Graphs in Persistence Operations, 43.2.1 Applying Named Entity Graph Annotations to Entity Classes, 43.2.2 Obtaining EntityGraph Instances from Named Entity Graphs, 43.3 Using Entity Graphs in Query Operations, 44 Using a Second-Level Cache with Java Persistence API Applications, 44.1.1 Controlling whether Entities May Be Cached, 44.2 Specifying the Cache Mode Settings to Improve Performance, 44.2.1 Setting the Cache Retrieval and Store Modes, 44.2.1.3 Setting the Cache Retrieval or Store Mode, 44.2.2 Controlling the Second-Level Cache Programmatically, 44.2.2.1 Checking whether an Entity's Data Is Cached, 44.2.2.2 Removing an Entity from the Cache, 44.2.2.3 Removing All Data from the Cache. A null string is represented by null. To learn more, see our tips on writing great answers. Java String isEmpty() method - javatpoint 7.3 A Simple JavaServer Faces Application, 7.6 The Lifecycle of a JavaServer Faces Application, 7.6.1 Overview of the JavaServer Faces Lifecycle, 7.7 Partial Processing and Partial Rendering, 7.8 Further Information about JavaServer Faces Technology, 8.2 The Lifecycle of a Facelets Application, 8.3 Developing a Simple Facelets Application: The guessnumber-jsf Example Application, 8.3.3 Running the guessnumber-jsf Facelets Example, 8.3.3.1 To Build, Package, and Deploy the guessnumber-jsf Example Using NetBeans IDE, 8.3.3.2 To Build, Package, and Deploy the guessnumber-jsf Example Using Maven, 8.3.3.3 To Run the guessnumber-jsf Example, 8.8.1.1 Configuring the hello1-rlc Example, 8.8.1.2 The Facelets Pages for the hello1-rlc Example, 8.8.1.3 To Build, Package, and Deploy the hello1-rlc Example Using NetBeans IDE, 8.8.1.4 To Build, Package, and Deploy the hello1-rlc Example Using Maven, 8.9.3 The reservation Example Application, 8.9.3.1 The Facelets Pages for the reservation Application, 8.9.3.2 The Managed Bean for the reservation Application, 8.9.3.3 To Build, Package, and Deploy the reservation Example Using NetBeans IDE, 8.9.3.4 To Build, Package, and Deploy the reservation Example Using Maven, 9.2 Immediate and Deferred Evaluation Syntax, 9.3.1.2 Referencing Object Properties or Collection Elements, 9.3.1.5 Where Value Expressions Can Be Used, 9.8 Further Information about the Expression Language, 10 Using JavaServer Faces Technology in Web Pages, 10.2 Adding Components to a Page Using HTML Tag Library Tags, 10.2.1.4 The style and styleClass Attributes, 10.2.1.5 The value and binding Attributes, 10.2.4.1 Rendering a Field with the h:inputText Tag, 10.2.4.2 Rendering a Password Field with the h:inputSecret Tag, 10.2.4.3 Rendering a Label with the h:outputLabel Tag, 10.2.4.4 Rendering a Link with the h:outputLink Tag, 10.2.4.5 Displaying a Formatted Message with the h:outputFormat Tag, 10.2.5 Using Command Component Tags for Performing Actions and Navigation, 10.2.5.1 Rendering a Button with the h:commandButton Tag, 10.2.5.2 Rendering a Link with the h:commandLink Tag, 10.2.6 Adding Graphics and Images with the h:graphicImage Tag, 10.2.7 Laying Out Components with the h:panelGrid and h:panelGroup Tags, 10.2.8 Displaying Components for Selecting One Value, 10.2.8.1 Displaying a Check Box Using the h:selectBooleanCheckbox Tag, 10.2.8.2 Displaying a Menu Using the h:selectOneMenu Tag, 10.2.9 Displaying Components for Selecting Multiple Values, 10.2.10 Using the f:selectItem and f:selectItems Tags, 10.2.11 Displaying the Results from Selection Components, 10.2.12 Using Data-Bound Table Components, 10.2.13 Displaying Error Messages with the h:message and h:messages Tags, 10.2.14 Creating Bookmarkable URLs with the h:button and h:link Tags, 10.2.15 Using View Parameters to Configure Bookmarkable URLs, 10.2.16 The bookmarks Example Application, 10.2.16.1 To Build, Package, and Deploy the bookmarks Example Using NetBeans IDE, 10.2.16.2 To Build, Package, and Deploy the bookmarks Example Using Maven, 10.2.17 Resource Relocation Using h:outputScript and h:outputStylesheet Tags, 11 Using Converters, Listeners, and Validators, 11.2.1 Registering a Value-Change Listener on a Component, 11.2.2 Registering an Action Listener on a Component, 11.4.1 Referencing a Method That Performs Navigation, 11.4.2 Referencing a Method That Handles an Action Event, 11.4.3 Referencing a Method That Performs Validation, 11.4.4 Referencing a Method That Handles a Value-Change Event, 12 Developing with JavaServer Faces Technology, 12.1 Managed Beans in JavaServer Faces Technology, 12.1.2 Using the EL to Reference Managed Beans, 12.2.1 Writing Properties Bound to Component Values, 12.2.2 Writing Properties Bound to Component Instances, 12.2.3 Writing Properties Bound to Converters, Listeners, or Validators, 12.3.1 Writing a Method to Handle Navigation, 12.3.2 Writing a Method to Handle an Action Event, 12.3.3 Writing a Method to Perform Validation, 12.3.4 Writing a Method to Handle a Value-Change Event, 13 Using Ajax with JavaServer Faces Technology, 13.2 Using Ajax Functionality with JavaServer Faces Technology, 13.10.1 Using JavaScript API in a Facelets Application, 13.10.2 Using the @ResourceDependency Annotation in a Bean Class, 13.11 The ajaxguessnumber Example Application, 13.11.1.1 The ajaxgreeting.xhtml Facelets Page, 13.11.1.2 The UserNumberBean Backing Bean, 13.11.1.3 The DukesNumberBean CDI Managed Bean, 13.11.2 Running the ajaxguessnumber Example, 13.11.2.1 To Build, Package, and Deploy the ajaxguessnumber Example Using NetBeans IDE, 13.11.2.2 To Build, Package, and Deploy the ajaxguessnumber Example Using Maven, 13.11.2.3 To Run the ajaxguessnumber Example, 13.12 Further Information about Ajax in JavaServer Faces Technology, 14 Composite Components: Advanced Topics and an Example, 14.3 Validating Composite Component Values, 14.4 The compositecomponentexample Example Application, 14.4.4 Running the compositecomponentexample Example, 14.4.4.1 To Build, Package, and Deploy the compositecomponentexample Example Using NetBeans IDE, 14.4.4.2 To Build, Package, and Deploy the compositecomponentexample Example Using Maven, 14.4.4.3 To Run the compositecomponentexample Example, 15 Creating Custom UI Components and Other Custom Objects, 15.1 Determining Whether You Need a Custom Component or Renderer, 15.1.3 Component, Renderer, and Tag Combinations.
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how to return empty string in java
