Question

我想界定 Java中一种任意类型的原始数据类型。是否可能从一种任意的类型到另一种任意的类型来界定一种投放物?

public class Foo{
    //methods, constructor etc for this class
    ...
    //make it possible to cast an object of type Foo to an integer 
}
//example of how an object of type foo would be cast to an integer
public class Bar(){
    public static void main(String[] args){
        Foo foo1 = new Foo();
        int int1 = (int)foo1;
        System.out.println(int1+"");
    }
}

Answer 1

您可以提出,但你可以提供转换功能:

public class Foo{
    //methods, constructor etc for this class
    ...
    public int toInt(){
        //convert to an int.
    }    
}

律师后来成为:

public class Bar(){
    public static void main(String[] args){
        Foo foo1 = new Foo();
        int int1 = foo1.toInt();
        System.out.println(int1+"");
    }
}

Answer 2

不可能从一类类(例如Foo)直接转换成一种原始类型。相反,你应界定将oo物体的价值作为ger酸(>)回归的方法。

Answer 3

无。这并不真正有意义:如何使用<代码>。 Foo成为int?

Rather define a sequence of appropriate methods, such as:

public int toInt() { return 42; }

Typecasting between primitive types and Java types, such as between int and Integer, was not even originally part of Java.

Answer 4

Foo必须延长人数。为什么你们想要这样做? 因此,不能仅仅获得禁忌内的一个隐形变量。

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