Java知识

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layout: post title: “2020-06-10-java知识.markdown” date: 2020-06-10 12:11:30 +0800

1. isAssignableFrom介绍 System.out.println(“ isAssignableFrom :” + (Person.class).isAssignableFrom(Student.class)); System.out.println(“ isAssignableFrom :” + (Student.class).isAssignableFrom(Person.class)); System.out.println(“ instanceOf :” + (student instanceof Person)); System.out.println(“ instanceOf :” + (person instanceof Student));

isAssignableFrom :true isAssignableFrom :false instanceOf :true instanceOf :false

1. ::onClick 作为回调,多次添加,会指向同一个匿名内部类吗?