Java 17 Recipes

 How It Works
The JavaBean is an object that holds information so that it can be passed around and 
used within an application. One of the most important aspects of a JavaBean is that its 
fields are declared as private. This prohibits other classes from accessing the fields 
directly. Instead, each field should be encapsulated by methods defined to make 
them accessible to other classes. These methods must adhere to the following naming 
conventions.
• Methods used for accessing the field data should be named using a 
get prefix, followed by the field name.
• Methods used for setting the field data should be named using a set 
prefix, followed by the field name.
For instance, in the solution to this recipe, the Team object contains a field with 
players’ names. To access that field, a getPlayers method should be declared. It should 
return the data that is contained within the players field. Likewise, a setPlayers 
method should be declared to populate the players field. It should accept an argument 
of the same type as the players field, and it should set the value of the players field 
equal to the argument. This can be seen in the following code.
public List
getPlayers() {
return players;
}
void setPlayers(List
players) {
this.players = players;
}
JavaBeans can populate lists of data written to a database record or for a myriad 
of other functions. Using JavaBeans makes code easier to read and maintain. It also 
helps to increase the likelihood of future code enhancements because very little code 
implementation is required. Another benefit of using JavaBeans is that most major IDEs 
autocomplete the encapsulation of the fields for you.
Chapter 5 ObjeCt-Oriented java

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168
5-6. Defining an Interface for a Class