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Main.java
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76 lines (63 loc) · 2.43 KB
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package ReflectionGateway;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) throws ClassNotFoundException {
// Class<?> is an entry point for us to reflect on our application's code.
// Multiple ways to do above
// 1. Object.getClass()
Map<String, Integer> map = new HashMap<>();
Class<?> hashMapClass = map.getClass();
// 2. Add .class suffix to class names.
Class<String> stringClass = String.class;
Class intClass = int.class;
// 3. Class.forName(..)
Class<?> squareClass = Class.forName("ReflectionGateway.Main$Square");
printClassInfo(hashMapClass, stringClass, intClass, squareClass);
System.out.println("-------------");
var circleObject = new Drawable() {
@Override
public int getNumberOfCorners() {
return 0;
}
};
printClassInfo(Collections.class, boolean.class, int[][].class, circleObject.getClass(), Color.class);
}
private static void printClassInfo(Class<?>... classes) {
for (Class<?> clazz : classes) {
System.out.println(String.format("Class name %s, class package name %s", clazz.getSimpleName(), clazz.getPackageName()));
Class<?>[] implementedInterfaces = clazz.getInterfaces();
for (Class<?> implementedInterface : implementedInterfaces) {
System.out.println(String.format("class %s implements %s", clazz.getSimpleName(), implementedInterface.getSimpleName()));
}
System.out.println("Is array: " + clazz.isArray());
System.out.println("Is primitive: " + clazz.isPrimitive());
System.out.println("Is enum: " + clazz.isEnum());
System.out.println("Is interface: " + clazz.isInterface());
System.out.println("Is anonymous: " + clazz.isAnonymousClass());
System.out.println("Superclass: " + clazz.getSuperclass());
System.out.println("Canonical name: " + clazz.getCanonicalName());
System.out.println("Type name: " + clazz.getTypeName());
System.out.println("Annotated Interfaces: " + clazz.getAnnotatedInterfaces());
System.out.println("Annotated Superclass: " + clazz.getAnnotatedSuperclass());
System.out.println("Declared Annotations: " + clazz.getDeclaredAnnotations());
System.out.println();
System.out.println();
}
}
private static class Square implements Drawable {
@Override
public int getNumberOfCorners() {
return 4;
}
}
private static interface Drawable {
int getNumberOfCorners();
}
private enum Color {
BLUE,
RED,
GREEN
}
}