Lab 10-31 Lab (2) Fibonacci numbers

import javax.swing.JOptionPane;
public class Untitled5
{
public static void main(String[] args)
{
String PString=JOptionPane.showInputDialog("輸入一個數：");
int n=Integer.parseInt(PString);
double j=0,i=0,k=1,m=0,h=1;
while (i!=n)
{
j=h+m;
System.out.println(" 數列 "+j);
if(k==1)
{
System.out.println("ratio "+j/h);
m=j;k=2;
}
else if(k==2)
{
h=j;k=1;
System.out.println("ratio "+j/m);}
i++;
}
System.exit(0);
}
}