那位大哥告诉我为什么用Java提交的程序，为什么常常RuntimeError，特别是在处理一些以零结尾的问题，例如：2640，程序如下：
import java.util.*;

public class Main
{
	private int halfCircleNum;
	private double halfCircles[];
	
	public static void main(String args[])throws Exception
	{
		Scanner cin=new Scanner(System.in);
		while(true)
		{
			int halfCircleNum;
			halfCircleNum=cin.nextInt();
			if(halfCircleNum==0)	break;
			double halfCircles[]=new double[halfCircleNum];
			for(int i=0;i<halfCircleNum;i++)
					halfCircles[i]=cin.nextDouble();
			new Main(halfCircleNum,halfCircles);			
		}
	}
	
	public Main(){};
	public Main(int halfCircleNum,double halfCircles[])
	{
		this.halfCircleNum=halfCircleNum;
		this.halfCircles=new double[halfCircleNum];
		System.arraycopy(halfCircles,0,this.halfCircles,0,this.halfCircleNum);
		this.output();
	}
	
	public void bubbleSort()
	{
		boolean flag=true;
		for(int i=halfCircleNum-1;flag&&i>0;i--)
		{
			flag=false;
			for(int j=0;j<i;j++)
				if(halfCircles[j]>halfCircles[j+1])
				{
					double temp=halfCircles[j];
					halfCircles[j]=halfCircles[j+1];
					halfCircles[j+1]=temp;
					flag=true;
				}			
		}
	}
	
	public boolean judge()
	{
		this.bubbleSort();
		int i,j,k;
		for(i=0;i<halfCircleNum-1;i++)
			if(this.halfCircles[i]==this.halfCircles[i+1])	return true;
		for(i=2;i<this.halfCircleNum-1;i++)
		{
			for(j=0;j<this.halfCircleNum-1;j++)
			{
				double sum=0.0;
				for(k=j;k<i+j;k++)	sum+=this.halfCircles[i+j];
				if(sum>=this.halfCircles[i+j+1])	return true;
			}
		}
		return false;
	} 
	
	public void output()
	{
		if(this.judge())	System.out.println("YES");
		else System.out.println("NO");
	}
	
}
望不吝赐教！谢～～～