什么是Java中的实例变量? [英] What is an instance variable in Java?

问题描述

我的任务是制作一个带有实例变量(字符串)的程序，该变量应该由用户输入.但是我什至不知道什么是实例变量.什么是实例变量?

My assignment is to make a program with an instance variable, a string, that should be input by the user. But I don't even know what an instance variable is. What is an instance variable?

如何创建一个?它是做什么的?

How do I create one? What does it do?

推荐答案

实例变量是在类内部但在方法外部声明的变量:

Instance variable is the variable declared inside a class, but outside a method: something like:

class IronMan {

    /** These are all instance variables **/
    public String realName;
    public String[] superPowers;
    public int age;

    /** Getters and setters here **/
}

现在，可以在另一个类中实例化此IronMan类以使用这些变量.像这样:

Now this IronMan Class can be instantiated in another class to use these variables. Something like:

class Avengers {

    public static void main(String[] a) {
        IronMan ironman = new IronMan();
        ironman.realName = "Tony Stark";
        // or
        ironman.setAge(30);
    }

}

这是我们使用实例变量的方式.无耻的插件:此示例摘自此免费电子书的此处此处.

This is how we use the instance variables. Shameless plug: This example was pulled from this free e-book here here.

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