revmatrix.txt

螺旋矩阵问题：编程产生H*L的螺旋矩阵。首先

 class HelixMatrix  {     
	int[][] myMatrix = new int[20][20];      
	static int H = 16;      
	static int L = 12;     
	static int count = 0;    //填充数字记数      
	int hh=H;                //矩阵实际大小      
	int ll=L;      
	int stepX = hh;          //初始步距      
	int stepY = ll-1;      
	int x=0;                 //初始坐标      
	int y=0; 
        void fillFromLeftToRight(int step)
	{	 //从左向右填写          
		for (int i=0; i<step; i++) 
		{              
			if (myMatrix[y][x]==0)
			{
				myMatrix[y][x] = ++count; 
			}             
			else
			{ 
				x++; 
				myMatrix[y][x] = ++count; 
			}                        
		}                
	};      
	void fillFromUpToDown(int step) 
	{	//从上向下填写          
		for (int i=0; i<step; i++) 
		{              
			y++;                            
			myMatrix[y][x] = ++count;          
		}      
	};      
	void fillFromRightToLeft(int step) 
	{	//从右向左填写          
		for (int i=0; i<step; i++) 
		{              
			x--;              
			myMatrix[y][x] = ++count;          
		}      
	};      
	void fillFromDownToUp(int step) 
	{	//从下向上填写          
		for (int i=0; i<step; i++) 
		{              
			y--;              
			myMatrix[y][x] = ++count;          
		}      
	};      
	public void make() 
	{	//生成矩阵：从左到右、从上到下、从右到左、          
		do 
		{                 //从下到上，每一循环填一圈，很好理解吧。:)                        
			if (count != H*L) 
				fillFromLeftToRight(stepX--);              
			if (count != H*L) 
				fillFromUpToDown(stepY--);                  
			if (count != H*L) 
				fillFromRightToLeft(stepX--);              
			if (count != H*L) 
				fillFromDownToUp(stepY--);              
		} 
		while (count!=H*L);      
	};      
	public void print() 
	{	//打印出来，要注意排版哟！J if语句控制补空格          
		for (int i=0; i<L; i++) 
		{              
			for (int j=0; j<H; j++)                  
				if (myMatrix[i][j] < 10) 
					System.out.print("   "+myMatrix[i][j]);                  
				else if (myMatrix[i][j] >= 100) 
					System.out.print(" "+myMatrix[i][j]);                  
				else 
					System.out.print("  "+myMatrix[i][j]);              
				System.out.println();          
			}      
		} 
	}; 

	public class PrintHelixMatrix
	{      
		public static void main(String[] args) 
		{          
			HelixMatrix aa = new HelixMatrix();          
			aa.make();          
			aa.print();      
		}
	}

}