print() method in a class

Programming Questions

alphachap

in Programming Questions • 2 years ago

I have a print() method within a class.

Such a name is convenient, but I get the error:

The method print() in the type ranging is not applicable for the arguments (String).

This is because it is trying to use ranging.print() within ranging.print() instead of the usual print().

Is there a way to do this, without renaming my print method?

class ranging {
int a,b;

...

void print() {
print("a="+a+", b="+b); <<==== ERROR

}//print()

}//class ranging

Replies(4)

quarks

Re: print() method in a class

2 years ago

Use this as it will differentiate between the 2 print methods

void print() {
System.out.print("a="+a+", b="+b);
}//print()

nootropic..

Re: print() method in a class

2 years ago

hint1: use println inside a print function

void setup() {
Ranging r = new ranging();
r.print();
}
class Ranging {
int a=1,b=2;
void print() {
println("a="+a+", b="+b);
}
}

first of all: a common convention is write class name with first letter as capital, so Ranging and not ranging

bytheway, i think than the problem is this:

when you, inside a "void print(){}" scope using the same name of the scope function java compiler would call the function itself, or mayebe the far reference to the function (like - as a class method - this.print() )

in fact if you try to put this:

class Ranging {
int a=1,b=2;
void print() {
print();
}
}

you'll get this error:

A StackOverflowError means that you have a bug that's causing a function

to be called recursively (it's calling itself and going in circles),

or you're intentionally calling a recursive function too much,

and your code should be rewritten in a more efficient manner.

Exception in thread "Animation Thread" java.lang.StackOverflowError

the print(String) you try to call inside your function is defined in PApplet main class (the class that represent a Processing.org sketch) and so you have to put this:

class Ranging {
int a=1,b=2;
void print() {
PApplet.print("a="+a+", b="+b);
}
}

instead you might be interested in toString function, that is a special function that is implicitly called in PApplet.print and PApplet.println:

void setup() {
Ranging r = new Ranging();
print(r); //this call PApplet.print that call implicitly PApplet.print( t.toString() );
}
class Ranging {
int a=1,b=2;
String toString() {
return "a="+a+", b="+b;
}
}

toString is a common-used and nice method to print object

i hope all those object oriented stuffs make sense for you, if you are interest google for: "object oriented programming java", otherways simply try to not write your function without processing.org defined names : )

PhiLho

Re: print() method in a class

2 years ago

Beside, there is no print() function in Processing with two arguments...

alphachap

Re: print() method in a class

2 years ago

Thanks for all the answers.

I'm a bit over my head here, but I understand.

I will try all these things as I experiment.

I use Processing because it's simpler than dealing with Java,

but of course Java is not far away, and I am slowly learning both.

When I look at all the functions in the Processing reference, I am amazed that I haven't use most of them, because my small programs mostly gravitate around what I'm familiar with.

There's a world of possibilities there! (and so little time...)

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