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by repsilat
2798 days ago
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I guess I'm not sure what "object" means in Java, then. In languages I'm used to, an object is a type of value, and values are things that you can store in (or refer to with) variables. The only vaguely object-like feature of Java classes I can think of is that you can look up (static) methods/attributes on them with a dot. Or is there more? You can't call `String.toString()`, so `String` isn't an instance of something that inherits from `Object`. I'm at a bit of a loss here... There obviously exist "class objects", but they're not normally what people refer to when they talk about classes. I'd say Java classes are almost purely lexical constructs (though I could be wrong there -- again, I don't know much about Java...) |
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Class theStringClass = String.class;
Class[] myArrayOfClasses = new Class[1];
myArrayOfClasses[0] = theStringClass;
callSomeOtherMethod(theStringClass);
> You can't call `String.toString()`
String.class.toString() => "class java.lang.String"
theStringClass.toString() => "class java.lang.String"
myArrayOfClasses[0].toString() => "class java.lang.String"
somethingThatReturnsAClass().toString() => "class java.lang.String"
> `String` isn't an instance of something that inherits from `Object`
Class theObjectClass = Object.class;
theObjectClass.isAssignableFrom(theStringClass) => true
> I'd say Java classes are almost purely lexical constructs
They aren't - here's the source code for the Class class.
https://github.com/Project-Skara/jdk/blob/c2105ced865fba11fb...
Here's the source code for the toString method we were calling
https://github.com/Project-Skara/jdk/blob/c2105ced865fba11fb...