triangle.txt

java的一经典教程

// Draws a triangle
	// in a single dialog box
	import javax.swing.JOptionPane;

	public class Triangle
	{
		public static void main(String[] args)
		{
			JOptionPane.showMessageDialog(null,
			   "@\n@@\n@@@\n@@@@");

			System.exit(0);
		}
	}