主题：程序代码——打印星号三角形

public class exec
{
   public static void main( String args[] )
   {
                String s=javax.swing.JOptionPane.showInputDialog("Num");
                int i=Integer.parseInt(s);
                for(int c=0;c<i;c++)
                {
                        for(int d=0;d<i-1-c;d++)
                                System.out.print(" ");
                        for(int d=0;d<(c+1)*2-1;d++)
                                System.out.print("*");
                        System.out.print("\n");
                }
   }
}