Java 程序设计 打印数字金字塔

import javax.swing.JOptionPane;

public class PrintPyramid

{

public static void main(String[] args)

{

String input = JOptionPane.showInputDialog("Enter the number of lines");

int numberOfLines = Integer.parseInt(input);

if (numberOfLines < 1 || numberOfLines > 15)

{

System.out.println("You must input a number 1 ~ 15");

System.exit(0);

}

for (int row = 1; row <= numberOfLines; row++)

{

for (int column = 1; column <= numberOfLines - row; column++)

{

System.out.print(" ");

}

for (int num = row; num >= 1; num--)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

for (int num = 2; num <= row; num++)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

for (int num = numberOfLines - row + 1; num >= 1; num--)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

for (int num = 2; num <= numberOfLines - row + 1; num++)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

System.out.println();

}

/*

for (int row = numberOfLines - 1; row >= 0; row--)

{

for (int column = 1; column <= numberOfLines - row; column++)

{

System.out.print(" ");

}

for (int num = row; num >= 1; num--)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

for (int num = 2; num <= row; num++)

{

System.out.print(num >= 10 ? " " + num : " " + num);

}

System.out.println();

}

*/

}

}