This topic is about Java 11 – Nested Based Access.
Java 11 introduced a concept of nested class where we can declare a class within a class. This nesting of classes allows to logically group the classes to be used in one place, making them more readable and maintainable. Nested class can be of four types −
- Static nested classes
- Non-static nested classes
- Local classes
- Anonymous classes
Java 11 also provide the concept of nestmate to allow communication and verification of nested classes.
Consider the following example −
ApiTester.java
import java.util.Arrays;
import java.util.Set;
import java.util.stream.Collectors;
public class APITester {
public static void main(String[] args) {
boolean isNestMate = APITester.class.isNestmateOf(APITester.Inner.class);
boolean nestHost = APITester.Inner.class.getNestHost() == APITester.class;
System.out.println(isNestMate);
System.out.println(nestHost);
Set<String> nestedMembers = Arrays.stream(APITester.Inner.class.getNestMembers())
.map(Class::getName)
.collect(Collectors.toSet());
System.out.println(nestedMembers);
}
public class Inner{}
}
Output
true true [APITester$Inner, APITester]
In this topic we learned about Java 11 – Nested Based Access. To know more, Click Here.
Pingback: Java 11 - Var in Lambda - Adglob Infosystem Pvt Ltd