please help!! FactorGenerator

[afrttoh]

I have to write a program that asks the user for an integer and then display all its factors For example, when the user enters 15, the program should display the following:
1
3
5
15

Below is what I have managed to do so far but I am kind of stuck on
Doing I am not sure where to put the JOptionPane.showInputDialog
and the JOptionPane.showMessageDialog

import javax.swing.JOptionPane;

public class FactorGenerator {

    private int num;
    private int nextFactor;

   
	

    public int getNextFactor()
    {
    	int i = nextFactor - 1 ;

    	while ((num % i) != 0)
    	{
    		i--;
			
    	}
        nextFactor = i;
		
        return i;
    }

	public boolean hasMoreFactors()
    {
		
	
        if (nextFactor == 1)
        {
            return false;
			
        }
    	else
        {
            return true;

        }
    }
}

[MuslimCoder]

* Create Object of JOptionPane
* Using the object , try using the appropriate method for showing the msg box. You can find this in the API.

[afrttoh]

i know all that thank you but where to put it??
i tried to put in:

public static void main(String[] args)
{
String num = JOptionPane.showInputDialog("Enter a whole number:");
int number = Integer.parseInt(num);
JOptionPane.showMessageDialog(null, " = " + i);

}

but it gives me error!

and what do you mean API?

[Fubarable]

I would first of all give your FactorGenerator class a way to initialize it's num and nextFactor numbers. This can be done by passing an int in its constructor and setting both num and nextFactor equal to this int. Alternatively (or in addition) you can do this via a setNum(int aNumber) method that again will set both num and nextFactor equal to the parameter.

Then you can worry about getting input from the user and showing output to the user in the main method.

[angryboy]

what kind of errors? it worked for me. mc meant to take a look at the java docs.

  1. import javax.swing.JOptionPane;
  2.
  3. public class test
  4. {
  5. public static void main(String[] args)
  6. {
  7.    // int i = 3;
  8.    String num = JOptionPane.showInputDialog("Enter a whole number:");
  9.    int number = Integer.parseInt(num);
 10.    JOptionPane.showMessageDialog(null, " = " + number ); // original was "+ i );"
 11. }
 12. }

[afrttoh]

* Create Object of JOptionPane
* Using the object , try using the appropriate method for showing the msg box. You can find this in the API.

what kind of errors? it worked for me. mc meant to take a look at the java docs.

  1. import javax.swing.JOptionPane;
  2.
  3. public class test
  4. {
  5. public static void main(String[] args)
  6. {
  7.    int i = 3;
  8.    String num = JOptionPane.showInputDialog("Enter a whole number:");
  9.    int number = Integer.parseInt(num);
 10.    JOptionPane.showMessageDialog(null, " = " + i);
 11. }
 12. }

import javax.swing.JOptionPane;

public class FactorGenerator {

    private int num;
    private int nextFactor;

public static void main(String[] args)
	{
		String num =	JOptionPane.showInputDialog("Enter a whole number:");
		int number = Integer.parseInt(num);
		JOptionPane.showMessageDialog(null, " = " + i);

	}


    public int getNextFactor()
    {
    	int i = nextFactor - 1 ;

    	while ((num % i) != 0)
    	{
    		i--;
			
    	}
        nextFactor = i;
		
        return i;
    }

	public boolean hasMoreFactors()
    {
		
	
        if (nextFactor == 1)
        {
            return false;
			
        }
    	else
        {
            return true;

        }
    }
}

errors:

---------- javac ----------
C:\Documents and Settings\Administrator\Desktop\FactorGenerator.jav a:16: cannot find symbol
symbol : variable i
location: class FactorGenerator
JOptionPane.showMessageDialog(null, " = " + i);
^
1 error

Output completed (0 sec consumed)

[afrttoh]

I would first of all give your FactorGenerator class a way to initialize it's num and nextFactor numbers. This can be done by passing an int in its constructor and setting both num and nextFactor equal to this int. Alternatively (or in addition) you can do this via a setNum(int aNumber) method that again will set both num and nextFactor equal to the parameter.

Then you can worry about getting input from the user and showing output to the user in the main method.

thank you ill give it a try.

[angryboy]

you need to declare i first. like i had. on line 7 in the quotes.

[afrttoh]

I would first of all give your FactorGenerator class a way to initialize it's num and nextFactor numbers. This can be done by passing an int in its constructor and setting both num and nextFactor equal to this int. Alternatively (or in addition) you can do this via a setNum(int aNumber) method that again will set both num and nextFactor equal to the parameter.

Then you can worry about getting input from the user and showing output to the user in the main method.

can you show me an example please i am a bit lost!

[afrttoh]

still cant do it!

[Fubarable]

If I wanted to initialize my class with an int via a constructor, I'd do something as simple as:

class MyClass
int value;

  public MyClass(int value)
  {
    this.value = value;  // here I initialize value via the constructor parameter
  }

  public void myMethod()
  {
    // .... etc...
  }
}

then my main method can construct an object of this class and pass an int into it at the same time:

public static void main(String[] args)
{
  MyClass myObject = new MyClass(3); // pass a 3 into the object via a constructor parameter
  myObject.myMethod(); 
  // ... etc...
}