methods

[Zensai]

MY PROBLEM: I dont know how to organize the main method.

The program has 5 methods.

The program has to start with the 1st method,
then go to the 2nd (typing this at the end of the 1st method:

Code:

secondMethod(NewVector);

Then the 3rd method has to start.
The 3rd method uses an Array from the 2nd method.
Finally the 4th method has to start.
The 4th method needs an int calculation from the 5th method (the 5th method is 'private/public int' method with return).
The 4th method 'goes' to the 5th through this:

Code:

if(nameOfFifthMethod==-1){...}

The 5th method uses the Array list from the 2nd method and a String from the 4th method (that is different everytime the 5th method is being executed).

So:

Code:

public static void main (String [] args) {what should be written here? }

only the 'request' to start the 1st method (and the others will be executed automatically)? all the method except the 5th method (the only one that returns)? all of the 5 methods?

[sandeepkk2005]

In main, create an object of the class and call the 1st method. from there call 2nd, and in 2nd call 3rd etc.

[Zensai]

why (=why we have to create an object) and how (we create an object, we call other methods)? thanx for your quick respond.

[sandeepkk2005]

Object should be created to access any methods or variables inside the class.
alternative is that u can use static methods & variables but is not preferred in Java.

class Test
{
public Test()
{
}

public void Method1()
{
//u can call method 2 or any other method here
}

public void Method2()
{
}

public void Method3()
{
}

public static void main(String args[])
{
Test test = new Test();//Creating an object to initialize
test.Method1();//u can pass parameters here
}
}

[Zensai]

Questions 1) why you created this empty method

Code:

public Test()
{
}

and 2) why it has the same name with the class? (Lets say that the class name is 'ClassName' to make it easier.) 3) why the main method is at the end? 4)Can i do this (inside the main method): ClassName.method2(); 3 4 5 etc or i can do it only for one method? 5)how i call other methods when im inside a method? like this? (lets say we are inside the method 1):

Code:

nameOfMethod2.(and inside here name of the string, arrays etc method 2 uses from method 1);

? or can i do something like this

Code:

method1.method2(parameters taken from method 1 and used in method 2);

(when i am inside the method1)? But for example, my 4th method doesnt 'need' anything from the 3rd method. (maybe im confused between two different procedures)

can you please reply to them one by one? (it gonna be easier for me to understand them and faster for you to type them)
1000 thanx a priori!


PS java.lang.NoSuchMethodError: main
Exception in thread "main"

[Eranga]

You can add your main method anywhere inside the class. When you execute the program, it search the main method inside the class. There is no order to use them.

[Zensai]

[Eranga]

When I go trough your questions, I feel that you are really newbie for Java. So it can be really helpful to you start learn those things first, with simple examples. I'll try to answer to you as much as possible.

Quote:

Originally Posted by Zensai

why you created this empty method

There is no point. If you want you can do anything inside a method.

[sandeepkk2005]

This empty method
public Test()
{
}

is called the constructor.
I prefer you to go through Java basics.

[Zensai]

ive read what a constructor is, how about the rest questions?

[Eranga]

Quote:

3) why the main method is at the end?

There is no order to put the main method at the end. You can place it anywhere on the application. The normal practice is place the main method after all other functions/methods.

When you run the application, it searches the main method first. No matter it is at the end or beginning.