在Java中使用setRGB（x，y，0）后如何显示图像？

Question

for(int x=0;x<20;x++)
{
    for(int y=0;y<20;y++)
    {
       img.setRGB(x, y,0);
    }
}

I'm trying to convert all pixels in a 20*20 region to black colour. But this is not working with the above code. Do i need to add anything more?

Answer 1

try this

int rgb=new Color(0,0,0).getRGB(); // i believe rgb for black is 0,0,0 but cross check


for(int x=0;x<20;x++){

for(int y=0;y<20;y++){

              img.setRGB(x, y,rgb);

              }
         }