Java打印图案

最新推荐文章于 2024-01-18 10:13:24 发布

原创最新推荐文章于 2024-01-18 10:13:24 发布 · 1k 阅读

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CC 4.0 BY-SA版权

本文介绍如何利用Java的for循环来绘制各种复杂的星图，通过实例展示for循环在图形打印中的应用。

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java打印星图（for循环的运用)

import java.util.*;

public class PrintStarPicture
{
	
	public static void main(String[] args)
	{
		Scanner in=new Scanner(System.in);
		System.out.print("请输入一个数字：n=");	//输入n=5
		int n=in.nextInt();
		System.out.println();
		/*
		* * * * *
		* * * *
		* * *
		* *
		*
		* *
		* * *
		* * * *
		* * * * *
	  x: 1  2  3  4  5  6  7  8  9
	x-5:-4 -3 -2 -1  0  1  2  3  4
  |x-5|: 4  3  2  1  0  1  2  3  4
      y: 5  4  3  2  1  2  3  4  5
		*/
		for (int i=-n+1;i<n ;i++ )
		{
			for (int j=1;j<=Math.abs(i)+1 ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		for (int i=1;i<2*n ;i++ )
		{
			for (int j=1;j<=Math.abs(i-n)+1 ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		/*
		* * * * *
		 * * * *
		  * * *
		   * *
		    *
		   * *
		  * * *
		 * * * *
		* * * * *
	  x: 1  2  3  4  5  6  7  8  9
	x-5:-4 -3 -2 -1  0  1  2  3  4
  |x-5|: 4  3  2  1  0  1  2  3  4
      y: 5  4  3  2  1  2  3  4  5
	 "": 0  1  2  3  4  3  2  1  0
		*/
		for (int i=-n+1;i<n ;i++ )
		{
			for(int k=1;k<n-Math.abs(i);k++)
			{
				System.out.print(" ");
			}
			for (int j=1;j<=Math.abs(i)+1 ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		for (int i=1;i<2*n ;i++ )
		{
			for(int k=1;k<n-Math.abs(i-n);k++)
			{
				System.out.print(" ");
			}
			for (int j=1;j<=Math.abs(i-n)+1 ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		/*
		*
		* *
		* * *
		* * * *
		* * * * *
		* * * *
		* * *
		* *
		*
	  x: 1  2  3  4  5  6  7  8  9
	x-5:-4 -3 -2 -1  0  1  2  3  4
  |x-5|: 4  3  2  1  0  1  2  3  4
      y: 1  2  3  4  5  4  3  2  1
		*/
		for (int i=-n+1;i<n ;i++ )
		{
			for (int j=1;j<=n-Math.abs(i) ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		for (int i=1;i<2*n ;i++ )
		{

			for (int j=1;j<=n-Math.abs(i-n) ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		/*
		    *
		   * *
		  * * *
		 * * * *
		* * * * *
		 * * * *
		  * * *
		   * *
		    *
	  x: 1  2  3  4  5  6  7  8  9
	x-5:-4 -3 -2 -1  0  1  2  3  4
  |x-5|: 4  3  2  1  0  1  2  3  4
      y: 1  2  3  4  5  4  3  2  1
	" ": 4  3  2  1  0  1  2  3  4
		*/
		for (int i=-n+1;i<n ;i++ )
		{
			for(int k=1;k<=Math.abs(i);k++)
			{
				System.out.print(" ");
			}
			for (int j=1;j<=n-Math.abs(i) ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
		for (int i=1;i<2*n ;i++ )
		{
			for(int k=1;k<=Math.abs(i-n);k++)
			{
				System.out.print(" ");
			}
			for (int j=1;j<=n-Math.abs(i-n) ;j++ )
			{
				System.out.print("*"+" ");
			}
			System.out.println();
		}
		System.out.println();
	}
}