Java利用switch嵌套模板

public class nested {            //记得修改文件名
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int i=1,j,s=0,s1;
		while(i<101)
		{
			j=1;
			s1=0;
			while(j<=i)
			{
				s1=s1+j;
				j++;
			}
			s=s+s1;
				i++;
		}
		System.out.println(s);
	}
}