用Java绘制横的柱状图：读入5个数，每个数在1~15范围内，每个*代表一个数字，显示出柱状图

以下是使用Java Swing绘制横向柱状图的示例代码：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class HorizontalBarChart extends JFrame {
    private static final long serialVersionUID = 1L;
    private int[] data;

    public HorizontalBarChart(int[] data) {
        this.data = data;
        setTitle("Horizontal Bar Chart");
        setSize(500, 300);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel() {
            private static final long serialVersionUID = 1L;

            @Override
            public void paintComponent(Graphics g) {
                super.paintComponent(g);
                int width = getWidth();
                int height = getHeight();
                int barWidth = width / data.length;
                int maxBarHeight = height - 50;
                g.setColor(Color.BLUE);
                for (int i = 0; i < data.length; i++) {
                    int barHeight = data[i] * maxBarHeight / 15;
                    int x = i * barWidth + 50;
                    int y = height - barHeight - 20;
                    g.drawString(String.valueOf(data[i]), x + 5, y - 5);
                    g.fillRect(x, y, barWidth - 10, barHeight);
                }
            }
        };
        panel.setPreferredSize(new Dimension(500, 300));
        getContentPane().add(panel);
    }

    public static void main(String[] args) {
        int[] data = { 5, 10, 2, 8, 12 };
        HorizontalBarChart chart = new HorizontalBarChart(data);
        chart.setVisible(true);
    }
}

在这个示例中，我们使用了JPanel类来绘制柱状图。在paintComponent方法中，我们首先计算出每个柱子的宽度和高度，然后通过循环绘制出每个柱子，并在顶部标注该柱子的值。为了使柱状图更加美观，我们将柱子的颜色设置为蓝色。最后，我们将绘制好的柱状图添加到JFrame中并显示出来。