Information about the system class | Together Java | Page 1

tame trail Dec 25, 2022, 6:46 AM

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Hello is the out object automatically created or is it actually a field confused since I know print, println, printf are methods. Please ping me also if you have an answer.

quick ivyBOT Dec 25, 2022, 6:46 AM

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<@&987246399047479336> please have a look, thanks.

quick ivyBOT Dec 25, 2022, 6:46 AM

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quick ivy <@&987246399047479336> please have a look, thanks.

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cloud abyss Dec 25, 2022, 7:58 AM

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tame trail Hello is the out object automatically created or is it actually a field confused...

it's a field that gets populated by the JVM

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since that's the part which is responsible for talking to the operating system

tame trail Dec 25, 2022, 8:15 AM

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cloud abyss it's a field that gets populated by the JVM

Ok so it's not actually an object it's a field confused why I'm seeing that it's an object with methods but fields don't have methods

cloud abyss Dec 25, 2022, 8:15 AM

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it is an object

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and a field

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field is a property of a class, it can be an object or a primitive

tame trail Dec 25, 2022, 8:16 AM

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So like
System class
Out field
Out object
Print method
Println method
Printf method

cloud abyss Dec 25, 2022, 8:16 AM

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primitives don't have methods, objects do

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out is a static field of class System which has type PrintStream

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and the PrintStream class has all those methods

tame trail Dec 25, 2022, 8:19 AM

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cloud abyss `out` is a static field of class `System` which has type `PrintStream`

What does has a type mean?

cloud abyss Dec 25, 2022, 8:20 AM

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it means what kind of class does a variable or a field belong to

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classes are blueprints for objects

tame trail Dec 25, 2022, 8:20 AM

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Yes

cloud abyss Dec 25, 2022, 8:20 AM

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you can create onstances of them

tame trail Dec 25, 2022, 8:20 AM

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Yes

cloud abyss Dec 25, 2022, 8:21 AM

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like for example "foo" is a object of type String

tame trail Dec 25, 2022, 8:21 AM

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Yes

cloud abyss Dec 25, 2022, 8:22 AM

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public static final String foo = "foo";
here you declare a field foo with type String which refers a string with value "foo"

tame trail Dec 25, 2022, 8:22 AM

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Yes

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PrintStream is a type like String, int, float etc?

cloud abyss Dec 25, 2022, 8:25 AM

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yeah

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it's a class someone wrote

tame trail Dec 25, 2022, 8:28 AM

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Alright thanks for explaining

tame trail Dec 25, 2022, 8:34 AM

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cloud abyss it's a class someone wrote

So I got
System class
PrintStream type = out obj = PrintStream
Then print, println, printf methods

cloud abyss Dec 25, 2022, 8:34 AM

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what do you mean by "PrintStream type = out"

tame trail Dec 25, 2022, 8:34 AM

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It's a type to have the out instance?

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To then call each of the print methods?

cloud abyss Dec 25, 2022, 8:35 AM

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kinda
out is a field that points to an object
and that object is of type PrintStream

tame trail Dec 25, 2022, 8:36 AM

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Could you show me in code maybe I'll understand

cloud abyss Dec 25, 2022, 8:36 AM

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you can check it out yourself in an IDE

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java sources are fully available

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just go to the System class

tame trail Dec 25, 2022, 8:36 AM

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Alright I'll look at it

tame trail Dec 25, 2022, 8:40 AM

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cloud abyss just go to the System class

Thanks for the information closing thread

#Information about the system class