三色旗问题

package qinglin.learn.arithmetic;

public class ThreeColorFlag
{

	public static void main(String[] args)
	{
		char color[] = {'b', 'w', 'b', 'w', 'w',
				'b', 'r', 'b', 'w', 'r'};
		int wFlag=0;
		int bFlag=0;
		int rFlag=color.length-1;
		ThreeColorFlag demo=new ThreeColorFlag();
		demo.printFlag(color);
		
		while(wFlag<=rFlag)
		{
			if(color[wFlag]=='w')
				wFlag++;
			else if(color[wFlag]=='b')
			{
				demo.swap(color,wFlag,bFlag);
				bFlag++;
				wFlag++;
			}
			else
			{
				while(color[rFlag]=='r')
					rFlag--;
				demo.swap(color,wFlag,rFlag);
				rFlag--;
			}
		}
		demo.printFlag(color);
		
	}
	public void swap(char color[],int i,int j)
	{
		char temp=color[i];
		color[i]=color[j];
		color[j]=temp;
	}
	public void printFlag(char color[])
	{
		for(int i=0;i<color.length;i++)
			System.out.print(color[i]+"  ");
		System.out.println();
	}	
}