如何使用实例引用实例? [英] How do I reference instances using an instance?

问题描述

由于我对Java没有特别的了解，所以我正在尝试最小化创建实例的数量.目前，我的Main中有一组其他类的实例，一个简单的示例...

I'm trying to minimize how much I create an instance, as I am not particularly skilled in Java. Currently I have a set of instances of other classes in my Main, a quick example...

public final class ClassName extends JavaPlugin {

    AntiSwear antiSwear = new AntiSwear();
    Spam spam = new Spam();

    @Override
    public void onEnable() {
        // Plugin startup logic
    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
    }
}

而不是创建越来越多的实例，我只想创建主类ClassName className = new ClassName();的实例并运行类似className.spam...

And instead of making more and more instances, I just want to make an instance of the main class, ClassName className = new ClassName(); and run something like className.spam...

基本上是将我的胡言乱语变成英语:我只想看看如何使用实例来引用实例.

Basically to put my gibberish into English: I just want to see how to reference instances using an instance.

推荐答案

有几种解决方法.第一种方法是使用 访问修饰符:

There are a few ways to go about this. The first way is to use the public access modifier:

public AntiSwear antiSwear = new AntiSwear();
public Spam spam = new Spam();

这使得可以从ClassName的实例访问实例，例如:

This makes the instances accessible from an instance of ClassName, for example:

ClassName className = new ClassName();
className.spam...;
className.antiSwear...;

第二种方法涉及 获取器 和设置器 ，它提供了一种方法，可以由包含实例并且具有访问权限的任何类或子类来调用该方法:

The second method involves getters and setters, which provide a method that can be invoked by any class that contains an instance and has access, or by a subclass:

AntiSwear antiSwear = new AntiSwear();
Spam spam = new Spam();

public AntiSwear getAnitSwear(){
    return this.antiSwear;
}
public Spam getAnitSwear(){
    return this.spam;
}

现在您可以相应地调用getter了:

Now you can invoke the getter accordingly:

ClassName className = new ClassName();
className.getSpam()...;
className.getAntiSwear()...;

第三种方法涉及 static 访问修饰符:

The third method involves the static access modifier:

public static AntiSwear antiSwear = new AntiSwear();
public static Spam spam = new Spam();

这使实例可以从每个外部类访问，即使那些不包含实例的实例也是如此.这是因为:

This makes the instances accessible from every external class, even those that do not contain an instance. This is because:

static成员属于该类，而不是 具体实例.

static members belong to the class instead of a specific instance.

这意味着 static字段仅一个实例 存在，即使您创建了该实例的一百万个实例 类，否则您将不会创建任何类.它将被所有实例共享.

It means that only one instance of a static field exists even if you create a million instances of the class or you don't create any. It will be shared by all instances.

例如:

//Notice that I am not creating an instance, I am only using the class name
ClassName.spam...;
ClassName.antiSwear...;

这篇关于如何使用实例引用实例?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！