The this keyword in Java is a reference variable that refers to the current object. It is used within an instance method or a constructor to access members of the current object such as instance variables, meth
methods, and constructors of the class. However, there are some scenarios where the use ofthisis not appropriate or may lead to errors. In this article, we will explore when and how to use thethiskeyword in Java.
thiskeyword可用于在不论什么实例方法内指向当前对象,也可指向对其调用当前方法的对象,或者在须要当前类型对象引用时使用。 注:当一个类的属性名或成员变量与訪问该属性的方法參数名同样时,则须要使用thiskeyword来訪问类中的属性。以区分类的属性和方法中的參数。 4、superkeyword 因为子类不能继承父类的构造方法,因...
java基础 this keyword! 为了程序的可读性,通常将一个类中的表示同一属性的变量进行统一的命名。可是这样做又会导致成员变量与局部变量名字冲突导致无法訪问成员变量。为了解决问题,java中引入了this这个keyword!所以this 的作用就是用于在方法中訪问对象的其它成员! thiskeyword有下面三种常见使用方法: 1)通过thiskeyword...
initially i thought that the Me keyword is the same as the "this" keyword in java. however, for the 'this' keyword, we are able to use it in shared functions/subs but we could not use the Me keyword in shared functions/subs, so i was wondering is there a workaround? All replies ...
以下我们来看两个thiskeyword使用方法中须要注意的两个细节: 第一个细节:构造函数中调用构造函数仅仅能定义在构造函数的第一行. 这是为什么呢,由于初始化动作一定要先运行.这就是java语言定义的一个规则,假设不是定义在第一行,编译直接通只是. 我们看样例,把上面的构造函数3的语句交换位置: ...
public keywordtest(string name, int age) { this(); // the rest of the code } or, we can call the parameterized constructor from the no argument constructor and pass some arguments: public keywordtest() { this("john", 27); } note, that this() should be the first statement in the ...
Using the this KeywordWithin an instance method or a constructor, this is a reference to the current object— the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this. Using this ...
JavaScript this Keyword We usethiskeyword in an object method to access a property of the same object. For example, // person objectconstperson = {name:"John",age:30,// methodintroduce:function(){ console.log(`My name is${this.name}and I'm${this.age}years old.`); ...
In JavaScript,thiskeyword refers to theobjectwhere it is called. 1. this Inside Global Scope Whenthisis used alone,thisrefers to the global object (windowobject in browsers). For example, leta =this;console.log(a);// Window {}this.name ='Sarah';console.log(window.name);// Sarah ...