Java中class的getSimpleName(),getName(),getCanonicalName区别

• getSimpleName()
• getName()
• getCanonicalName
  这三个Class方法总是分不清

代码如下

@Slf4j
public class ClassNameDemo {


    class ClassInner {

    }


    static class ClassStaticInner{

    }


    public static void main(String[] args) {
        final Class<ClassNameDemo> classNameDemoClass = ClassNameDemo.class;
        final Class<ClassInner> classInnerClass = ClassInner.class;
        final Class<ClassStaticInner> classStaticInnerClass = ClassStaticInner.class;

        log.info("ClassNameDemo getSimpleName:{}",classNameDemoClass.getSimpleName());
        log.info("ClassNameDemo getName:{}",classNameDemoClass.getName());
        log.info("ClassNameDemo getCanonicalName:{}",classNameDemoClass.getCanonicalName());


        log.info("----------------------------------------");

        log.info("ClassInner getSimpleName:{}",classInnerClass.getSimpleName());
        log.info("ClassInner getName:{}",classInnerClass.getName());
        log.info("ClassInner getCanonicalName:{}",classInnerClass.getCanonicalName());


        log.info("----------------------------------------");



        log.info("ClassStaticInner getSimpleName:{}",classStaticInnerClass.getSimpleName());
        log.info("ClassStaticInner getName:{}",classStaticInnerClass.getName());
        log.info("ClassStaticInner getCanonicalName:{}",classStaticInnerClass.getCanonicalName());

    }


}

输出结果

总结

1. getSimpleName()获得的是简单的类名
2. getName()和getCanonicalName()在普通的情况下结果一样，都是包名+类名
3. getName()和getCanonicalName()在内部类的时候结果不一样，getName()是$,getCanonicalName()是.