consider them as equivalent. Since Wicket 8 is built on Java 8, we can choose to leverage lambda expressions to specify handler method: //create a standard link component add(ComponentFactory.link("id" method to support setObject(Object)"); } This means that models obtained using IModel as lambda expressions are read-only. When we work with forms we need to use a model that support also data storing. 1. Lambda Goodies Most of the default methods we find in IModel are meant to leverage Lambda expressions to transform model object. The following is a short reference for such methods: • filter(predicate):

consider them as equivalent. Since Wicket 8 is built on Java 8, we can choose to leverage lambda expressions to specify handler method: //create a standard link component add(ComponentFactory.link("id" method to support setObject(Object)"); } This means that models obtained using IModel as lambda expressions are read-only. When we work with forms we need to use a model that support also data storing. 1. Lambda Goodies Most of the default methods we find in IModel are meant to leverage Lambda expressions to transform model object. The following is a short reference for such methods: • filter(predicate):

consider them as equivalent. Since Wicket 8 is built on Java 8, we can choose to leverage lambda expressions to specify handler method: //create a standard link component add(ComponentFactory.link("id" method to support setObject(Object)"); } This means that models obtained using IModel as lambda expressions are read-only. When we work with forms we need to use a model that support also data storing. 1. Lambda Goodies Most of the default methods we find in IModel are meant to leverage Lambda expressions to transform model object. The following is a short reference for such methods: • filter(predicate):

access any kind of property, private fields included. Just like the Java language, property expressions support dotted notation to select sub properties. So if we want to display the name of the Person’s org.apache.wicket.markup.html.form.ChoiceRenderer which renders the two values using property expressions. In the following code we want to show a list of Person objects using their full name as value StringResourceModel allows to work with complex and dynamic string resources containing parameters and property expressions. The basic constructor of this model takes in input a resource key and another model. This further

setObject: ● In this way models are read-only by default, and can be implemented with lambda expressions: add(new Label("timeStamp", () -> LocalDate.now())); Models and forms ● In Wicket the concept