Type Switch with Functional Java 8

package io.github.ikysil.javaplayground.typeswitch; import javax.swing.*; import java.util.function.Consumer; import java.util.function.Supplier; public class TypeSwitchDemo { static class TypeSwitch<T> { private final T instance; private TypeSwitch(T instance) { this.instance = instance; } static <T> TypeSwitch<T> of(final T instance) { return new TypeSwitch<>(instance); } static <T> TypeSwitch<T> of(final Supplier<T> instanceSupplier) { return new TypeSwitch<>(instanceSupplier.get()); } <I> TypeSwitch<T> instanceOf(final Class<I> type, final Consumer<I> consumer) { if (type.isInstance(instance)) { consumer.accept(type.cast(instance)); } return this; } void noneMatches(final Consumer<Object> consumer) { consumer.accept(instance); } } public static void main(String[] args) { System.out.println("TypeSwitch Demo"); TypeSwitch.of(new JLabel()) .instanceOf(JComponent.class, o -> System.out.println("matched JComponent")); TypeSwitch.of(new Object()) .instanceOf(JComponent.class, o -> System.out.println("matched JComponent")) .noneMatches(o -> System.out.printf("none matched: %s of %s%n", o, o.getClass())); } }