Java class name pitfalls, output below. TL/DR: Don't rely on class.getSimpleName() / class.getCanonicalName() to give you anything meaningful.

MyClassNames.java

import java.util.function.BiConsumer;
import java.util.function.Consumer;

import static java.lang.String.format;

/**
 * Demo of some common pitfalls with class.getSimpleName() and class.getCanonicalName().
 * @author David Klotz
 */
public class MyClassNames {

    private static class StaticInnerClass {}
    private class InnerClass {}

    private static void logClassName(String prefix, Class<?> clazz) {
        System.out.println(format("%s:\n Simple:\t '%s'\n Name  :\t '%s'\n Canonical:\t '%s'\n Type name:\t '%s'\n\n", prefix, clazz.getSimpleName(), clazz.getName(), clazz.getCanonicalName(), clazz.getTypeName()));
    }

    public static void main(String[] args) {
        Runnable anonymous = new Runnable() {
            @Override
            public void run() {

            }
        };

        Runnable someLambda = () -> {};
        Consumer<String> someOtherLambda = s -> {};
        BiConsumer<String, Class<?>> methodReference = MyClassNames::logClassName;

        logClassName("Normal class", MyClassNames.class);
        logClassName("Static inner class", MyClassNames.StaticInnerClass.class);
        logClassName("Inner class", MyClassNames.InnerClass.class);
        logClassName("Anonymous class", anonymous.getClass());
        logClassName("Lambda runnable class", someLambda.getClass());
        logClassName("Lambda consumer class", someOtherLambda.getClass());
        logClassName("Method reference class", methodReference.getClass());
    }
}

output.txt

Normal class:
 Simple:	 'MyClassNames'
 Name  :	 'com.example.MyClassNames'
 Canonical:	 'com.example.MyClassNames'
 Type name:	 'com.example.MyClassNames'


Static inner class:
 Simple:	 'StaticInnerClass'
 Name  :	 'com.example.MyClassNames$StaticInnerClass'
 Canonical:	 'com.example.MyClassNames.StaticInnerClass'
 Type name:	 'com.example.MyClassNames$StaticInnerClass'


Inner class:
 Simple:	 'InnerClass'
 Name  :	 'com.example.MyClassNames$InnerClass'
 Canonical:	 'com.example.MyClassNames.InnerClass'
 Type name:	 'com.example.MyClassNames$InnerClass'


Anonymous class:
 Simple:	 ''
 Name  :	 'com.example.MyClassNames$1'
 Canonical:	 'null'
 Type name:	 'com.example.MyClassNames$1'


Lambda runnable class:
 Simple:	 'MyClassNames$$Lambda$1/110992469'
 Name  :	 'com.example.MyClassNames$$Lambda$1/110992469'
 Canonical:	 'com.example.MyClassNames$$Lambda$1/110992469'
 Type name:	 'com.example.MyClassNames$$Lambda$1/110992469'


Lambda consumer class:
 Simple:	 'MyClassNames$$Lambda$2/1638172114'
 Name  :	 'com.example.MyClassNames$$Lambda$2/1638172114'
 Canonical:	 'com.example.MyClassNames$$Lambda$2/1638172114'
 Type name:	 'com.example.MyClassNames$$Lambda$2/1638172114'


Method reference class:
 Simple:	 'MyClassNames$$Lambda$3/1651945012'
 Name  :	 'com.example.MyClassNames$$Lambda$3/1651945012'
 Canonical:	 'com.example.MyClassNames$$Lambda$3/1651945012'
 Type name:	 'com.example.MyClassNames$$Lambda$3/1651945012'