java纯粹面向对象吗？ [英] Is java Purely Object Oriented?

问题描述

我们说java不是纯粹的面向对象，因为原始数据类型不是对象。但是在下面的代码中，对象如何保存原始数据类型？

We are saying that java is not purely object oriented since primitive data types are not objects.But in below code how object is holding primitive data type?

public class Test{

    public Object meth(Object obj){
        System.out.println(obj instanceof Object);//It prints true
        System.out.println("Value = "+obj);//It prints "Value = 1"
        return obj;
    }


    public static void main(String[] args) {
        int a = 1;
        System.out.println(new Test().meth(a));
    }
}

推荐答案

这是称为 autoboxing 。基本上，当您在需要它们作为对象的上下文中使用它们时，Java编译器会将原始数据类型转换为对象。

It's called autoboxing. Basically, the Java compiler converts primitive data types into objects for you when you use them in a context that requires them to be objects.

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