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- Question: java get subclasses of class
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java get subclasses of class
To get the subclasses of a particular class in Java, you can use the getSubclasses()
method from the Reflections
library. Here’s an example:
javaimport org.reflections.Reflections; import java.util.Set; public class MyClass { public static void main(String[] args) { Reflections reflections = new Reflections("com.example.package"); Set<Class<? extends MySuperclass>> subClasses = reflections.getSubTypesOf(MySuperclass.class); for (Class<? extends MySuperclass> subClass : subClasses) { System.out.println(subClass.getName()); } } }
In this example, replace "com.example.package"
with the package name that contains the classes you want to search for subclasses of MySuperclass
. Then the reflections.getSubTypesOf(MySuperclass.class)
method returns a Set
of all the classes that extend MySuperclass
. Finally, we iterate over the Set
and print out the names of each subclass.
Note that you’ll need to add the Reflections
library to your project dependencies in order to use this code.
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Java check class is subclass of
To check whether a class is a subclass of another class in Java, you can use the isAssignableFrom
method of the Class
class. This method returns true
if the specified class object represents a subclass of the class represented by the specified class object, or if the two classes are the same class.
Here’s an example code snippet that demonstrates how to use the isAssignableFrom
method to check if a class is a subclass of another class:
javaClass<?> superClass = SuperClass.class; Class<?> subClass = SubClass.class; if (superClass.isAssignableFrom(subClass)) { System.out.println("SubClass is a subclass of SuperClass."); } else { System.out.println("SubClass is not a subclass of SuperClass."); }
In the above example, SuperClass
is the name of the superclass, and SubClass
is the name of the subclass. If SubClass
is a subclass of SuperClass
, the program will output “SubClass is a subclass of SuperClass.” Otherwise, it will output “SubClass is not a subclass of SuperClass.”
Get all classes extend class Java
To get all classes that extend a particular class in Java, you can use Java Reflection API. Here’s an example code snippet that demonstrates this:
javaimport java.lang.reflect.Modifier; import java.util.ArrayList; import java.util.List; public class SubclassFinder { public static List<Class<?>> getSubclasses(Class<?> parentClass) { List<Class<?>> subclasses = new ArrayList<Class<?>>(); // Get all the classes in the same package as the parentClass Package parentPackage = parentClass.getPackage(); String packageName = parentPackage.getName(); ClassLoader classLoader = parentClass.getClassLoader(); List<Class<?>> classes = ClassFinder.getClasses(packageName, classLoader); // Filter the classes to get only the ones that extend the parentClass for (Class<?> clazz : classes) { if (parentClass.isAssignableFrom(clazz) && !clazz.equals(parentClass) && !Modifier.isAbstract(clazz.getModifiers())) { subclasses.add(clazz); } } return subclasses; } }
This code uses the ClassFinder
class to get all the classes in the same package as the parent class. Then it filters the classes to get only the ones that extend the parent class and are not abstract. Finally, it returns a list of subclasses.
You can see some more information related to java get subclasses of class here
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- Java Tip 113: Identify subclasses at runtime – InfoWorld
- Subclassing and Inheritance – Learning Java, 4th Edition [Book]
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- Java™ Tutorials – Interfaces and Inheritance
- Deriving a Class in Java – Tutorialspoint
- Java Examples & Tutorials of Reflections.getSubTypesOf (org …
- How do get the subclasses of Class – Oracle Forums
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- Java Inheritance (Subclass and Superclass) – W3Schools
- How can I get an array of all the subclasses of class X? : r/java
- [JavaSpecialists 298] – Finding Permitted Subclasses
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