使用java画一条线。

package p1008;

import javax.swing.*;
import java.awt.*;

public class LineAndTextExample extends JPanel {

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        // 设置线条粗细
        Graphics2D g2d = (Graphics2D) g;
        g2d.setStroke(new BasicStroke(5));

        // 绘制从左上角到右下角的线
        g2d.drawLine(0, 0, getWidth(), getHeight());

        // 设置文本属性
        g2d.setFont(new Font("Serif", Font.BOLD, 30));
        g2d.drawString("李太白", getWidth() / 2 - 50, getHeight() / 2);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Line and Text Example");
        LineAndTextExample panel = new LineAndTextExample();

        frame.add(panel);
        frame.setSize(400, 400);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}