Calling a method from within the same class

[gregpuzzles1]

I am new to the java programming language. This code is free of errors in Eclipse, what I am wondering is how to call the findOdds medhod from the main method. The findOdds method should return a list. I know in Python you could set it equal to a variable such as x = findOdds(100), I am just not sure how to do this in Java. Any help would be appreciated. Thanks.

import java.util.ArrayList;

public class TestVoidMethod {
	public static void main(String args[]){
		System.out.println("Hello World");
	}
	public ArrayList<Integer> findOdds(int number){
		ArrayList<Integer> odds = new ArrayList<Integer>();
		for(int i = 3; i < number + 1; i += 2){
			odds.add(i);
		}
		System.out.println(odds);
		return(odds);
	}
	
}

[KevinWorkman]

What happened when you tried?

Note that you have to create an instance of a class before you can call its non-static methods.

[gregpuzzles1]

All it does is print out the Hello World, I would like to put a statement below the Hello World line and call the findOdds method. Would something like findOdds newvar = new findOdds(100); work? The error I get when trying newvar is:

Multiple markers at this line
- findOdds cannot be resolved to a type

[KevinWorkman]

That's because findOdds is a method, not a type, so it really doesn't make sense to use "new" with it. The findOdds() method belongs to the type TestVoidMethod.

Recommended reading: Lesson: Classes and Objects (The Java™ Tutorials > Learning the Java Language)

[JosAH]

Would something like findOdds newvar = new findOdds(100); work?

You just made that up didn't you? Programming, not jut in Java but any programming language, is not throwing a couple of keywords and method names, sprinkled with a few interesting looking parentheses together and hope for the best. Google for "Java Tutorials" (or click the link supplied by Kevin) and read them carefully; better yet: study them.

kind regards,

Jos

[gregpuzzles1]

Yes I did pretty much just make that up. (LOL) It appears that making an object out of the main class and then referencing that object with the method name will work:

TestVoidMethod method = new TestVoidMethod();
System.out.println(method.findOdds(100));

[KevinWorkman]

You just made that up didn't you? Programming, not jut in Java but any programming language, is not throwing a couple of keywords and method names, sprinkled with a few interesting looking parentheses together and hope for the best.

Unless you're talking about lisp...

[JosAH]

Unless you're talking about lisp...

Lisp? Lisp? Kid stuff! You obviously have never seen Forth! Now that is a programming language for real men (like me)! ;-)

kind regards,

Jos