Programmer Think

In the process of implementing the interpreter, I found a fun thing, that is, how to better use the object-oriented idea to write code, and think about how to define a set of templates. Before starting again, I sorted out two kinds of object-oriented templates.One is a java style template(class classname (superclass) (. field) ( func t()( ...

1, toString method of Object class java.Lang.objectClass object is the root (parent) class of the class hierarchy.Each class (person, student...) All use object as the super (parent) class. All objects (including arrays) implement the methods of this class. public class Person { private String name; private int age; public Per ...

follow [front end Xiaoao] , read more original technical articles create object Create a single Object: Object constructor and Object literalDisadvantages: using one interface to create many objects produces a lot of duplicate code Relevant code → Factory mode Create a specific interface according to a specific object creation proce ...

Contents of this article 1, Basic concepts2, Implementation of hotspot Object.hashCode() mark wordget_next_hash(thread, obj)System.identityHashCode(obj)3, Test verification 1. After GC, the memory address of the object changes, but the hash value remains unchanged2. The hash value is saved in the mark word of the object header 1, ...

equals() and hashcode() in Java object comparison 1. Comparison and analysis of equals() method and "= =" First, put forward a misunderstanding: ==Address comparison during comparisonValues are compared when equals is compared String a = "123"; String b = "123"; System.out.println(a.equals(b)); // true System.out.println(a == b); ...

preface All objects in JavaScript are from Object; All objects from Object Prototype inherits methods and properties, which of course may be overridden. This article mainly introduces several methods of creating objects. 1. Object literal {...} Object literal is one of the most commonly used methods, which uses curly braces containin ...

I polymorphic 1. Class polymorphism Requirements: Demand: teachers go to work by bike Analysis: teachers, bicycles Demand upgrade / iteration: Bicycle - > car Steps: 1. Create a Car class and write start and stop 2. Write open and close based on the original Teacher class Note: violation of OCP principles OCP - opening an ...

Day11—API—Object API summary Application Programming Interface Interface oriented programming - interface documentation API development manual On the official website Object summary Package: Java lang ； Default auto guided package Class Object Class Object is the root class of the class hierarchy Each class uses Object as the supe ...

API introduction API (Application Programming Interface) refers to some predefined interfaces (such as functions and HTTP interfaces), or conventions for the connection of different components of software system. It is used to provide a set of routines that application programs and developers can access based on certain software or hardwar ...