编程珠玑banner函数

编写一个banner函数，该函数的输入为大写字母，输出为一个字符数组，该数组以图形化的方式表示该字母

package third;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;

import javax.swing.JLabel;

public class Banner {
    public static void outBanner(String c) {
        Font font = new Font("sanserif", Font.PLAIN, 12);
        // use a JLabel to get a FontMetrics object
        FontMetrics metrics = new JLabel().getFontMetrics(font);
        int width = metrics.stringWidth(c);
        int height = (int) (metrics.getAscent() - metrics.getDescent()) - 1;
        // use ARGB or the background will be black as well
        BufferedImage bi = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_ARGB);
        // create a Graphics2D object from the BufferedImage
        Graphics2D g2d = bi.createGraphics();
        g2d.setFont(font);
        g2d.setColor(Color.black);
        g2d.drawString(c, 0, height);
        g2d.dispose();
        for (int j = 0; j < height; j++) { // Scroll through rows
            for (int i = 0; i < width; i++) { // Scroll through columns
                // check for != 0 as black is -(2^24) and that's negative
                System.out.print(bi.getRGB(i, j) != 0 ? c : " "); // If pixel
                                                                    // rgb value
                                                                    // is zero,
                                                                    // output
                                                                    // '0',
                                                                    // else
                                                                    // '1'(want
                                                                    // monochome
                                                                    // image)
            }
            System.out.print("\n"); // next line
        }
    }

    public static void main(String[] args) {
        outBanner("E");
    }
}

 

输出结果为：

EEEEEE
E
E
E
EEEEEE
E
E
E
EEEEEE