实际上,您需要两个 for 循环,一个用于行,一个用于列,而您只使用了一个,这不足以绘制网格。
我已经画了网格作为我的作业,我已经和你分享了。它将帮助您找到编码中的问题...

import java.awt.*;
class Grids extends Canvas {
    int width, height, rows, columns;
    Grids(int w, int h, int r, int c) {
        setSize(width = w, height = h);
        rows = r;
        columns = c;
    }
    @Override
    public void paint(Graphics g) {
        int k;
        width = getSize().width;
        height = getSize().height;
        int htOfRow = height / (rows);
        for (k = 0; k < rows; k++) {
            g.drawLine(0, k * htOfRow, width, k * htOfRow);
        }
        int wdOfRow = width / (columns);
        for (k = 0; k < columns; k++) {
            g.drawLine(k * wdOfRow, 0, k * wdOfRow, height);
        }
    }
}
public class DrawGrids extends Frame {
    DrawGrids(String title, int w, int h, int rows, int columns) {
        setTitle(title);
        Grids grid = new Grids(w, h, rows, columns);
        add(grid);
    }
    public static void main(String[] args) {
        new DrawGrids("Draw Grids", 200, 200, 2, 10).setVisible(true);
    }
}