printpyramid.java

来自「单词计算器,可以统计你输入的单词的字母数有多少个等多个程序」· Java 代码 · 共 25 行

import javax.swing.JOptionPane;
public class PrintPyramid 
{   
	public static void main(String[] args) 		
	{
		String input=JOptionPane.showInputDialog(null,"Enter the number of lines:",
				"Example 3.9 Input",JOptionPane.QUESTION_MESSAGE);
		int numberOfLines = Integer.parseInt(input);
	        if (numberOfLines < 1 || numberOfLines > 15)
		       {
				System.out.println("You must enter a number from 1 to 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);
			System.out.println();
		}
	}
}