Initializing objects in Java without declaring a class or using a class

Question

I have general question regarding objects in Java. I want to initialize an object in Java without declaring a class or using a class.

In python for example you can do like this:

myObject = {"x":5,"y":10,"z":12,"name":"something"}

Now myObject is an object. And I can say myObject.x which will be 5.

From what I know I would have to do like this in Java:

class object(){
   int x;
   int y;
   int z;
   String name;
   myObject(int x, int y, int z, String name){
       this.x = x;
       this.y = y;
       this.z = z;
       this.name = name;
   }
}

myObject = new object(10,5,12,"something")

I would like to do that, but like in my python example. Hope anyone can help :)

*"And I can say myObject.x which will be 5."* No you can't. You're thinking of JavaScript. (Though I guess in JS you'd have to omit the quotation marks around the keys.) — Aran-Fey, Jul 29 '18 at 15:40

score 2 · Accepted Answer · answered Jul 29 '18 at 15:40

Java is statically typed so you can't point a variable to an instantiated object without declaring the class.

You can create classes without a pointer but they will just be collected by the garbage collection machine unless you're passing them to something that uses the new object you're creating.

This is nothing in Java:

myObject = {"x":5,"y":10,"z":12,"name":"something"}

Java doesn't know what to do with it.

score 0 · Answer 2 · answered Jul 29 '18 at 15:40

0

Java is not python, and you cannot instantiate a Java object with an anonymous Dict (the only type of object you can instantiate with a syntax like that is an array). That is, this

int[] a = {1, 2, 3};

is legal in Java.

answered Jul 29 '18 at 15:40

Elliott Frisch

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score 0 · Answer 3 · answered Jul 29 '18 at 15:55

There is no way to create an Object in Java without implicitly or explicitly calling the constructor and this involves creating a class which provides the blueprint for objects. (exception is by using deserialization)

Refer to this question for all the possible ways of creating Objects in java

Initializing objects in Java without declaring a class or using a class

3 Answers3