java - i 和 j 未初始化。但我已经写了 int i 和 int j 。怎么了

Question

当我尝试编译它时，Eclipse 说 i 和 j 尚未初始化。我究竟做错了什么？问题是关于创建一个圆圈。

public class Question2 
{

    public static void main(String[] args) {

        int x = 14;
        int y = 8;
        int radius = 5;


        DrawMeACircle(x,y,radius);

    }

    public static void DrawMeACircle(int x, int y, int radius)
    {

        int i, j;
        int gridsize = 99;
        int loop1;
        loop1 = ((x-i)*(x-i))+((y-j)*(y-j));
                // The problem is here (in the line above), it say i and j has not been initialized.

                int loop2 = loop1-radius*radius; 
                int c = radius-1; 

        for (i=0; i<gridsize; i++)
        {
            //System.out.print("#");
            for (j=0; j<gridsize; j++)
            {
                if(loop2 >=0 && loop2<= c )
                    {System.out.print("#");}
                else
                    {System.out.print(" ");}

            }
            System.out.print("\n"); 

        }
    }
}

Answer 1

局部变量必须用一个值初始化:

int i = 0;
int j = 0;

如果没有显式初始化，只有类 int 变量才会被设置为 0。