pane.java

Java大作业+学生成绩管理系统,采用access数据库连接。

//绘画面板
//package grade;

import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import javax.swing.*;


public class Pane extends JPanel{

	/**
	 * @param args
	 */
//	public String subject = null;
	//实例化一个数据处理对象
	private DataManager manager = new DataManager();
	//	画直方图
	public void paintComponent(Graphics g){
		
		
		int y = 0,h = 0,count = 0;
		g.drawString("分数段", 10, 190);
		//分数段0-60
		g.setColor(Color.red);
		h = manager.gethigh(Photo.sub, 60);
		count = manager.count();
		y = (int)h*200/count;
		g.fillRect(50, 200-y, 120, y);
		g.drawString("0", 50, 220);
		//统计人数
		g.drawString(Integer.toString(h), 110, 250);
		//分数段60-70
		g.setColor(Color.blue);
		h = manager.gethigh(Photo.sub, 70);
		count = manager.count();
		y = (int)h*200/count;
		g.fillRect(170, 200-y, 20, y);
		g.drawString("60", 150, 220);
		g.drawString(Integer.toString(h), 180, 250);
		//分数段70-80
		g.setColor(Color.red);
		h = manager.gethigh(Photo.sub, 80);
		count = manager.count();
		y = (int)h*200/count;
		g.fillRect(190, 200-y, 20, y);
		g.drawString("70", 180, 220);
		g.drawString(Integer.toString(h), 200, 250);
		//分数段80-90
		g.setColor(Color.blue);
		h = manager.gethigh(Photo.sub, 90);
		count = manager.count();
		y = (int)h*200/count;
		g.fillRect(210, 200-y, 20, y);
		g.drawString("80", 200, 220);
		g.drawString(Integer.toString(h), 220, 250);
		//分数段90-100
		g.setColor(Color.red);
		h = manager.gethigh(Photo.sub, 100);
		count = manager.count();
		y = (int)h*200/count;
		g.fillRect(2300, 200-y, 20, y);
		g.drawString("90", 220, 220);
		g.drawString("100", 250, 220);
		g.drawString(Integer.toString(h), 240, 250);
		//一些标签
		g.drawString("人数", 10, 250);
	}
	
	public static void main(String[] args) {
		// TODO 自动生成方法存根
		JFrame frame = new JFrame();
		Pane p = new Pane();
		Container con = frame.getContentPane();
		con.add(p);
		frame.setSize(300, 300);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
	}

}