stat.java

这是一个用java语言编的一个程序--学生管理系统

package stumanagement;

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

/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2007</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class Stat extends JDialog {
    public Stat(StuManagement stuM) {
        super(stuM, "成绩分布对话框",true);
        setSize(400, 300);
        setContentPane(new StatPanel(stuM));
    }
}

class StatPanel extends JPanel
{
    StuManagement stuM;
    double angle1,angle2, angle3, angle4;
    public StatPanel(StuManagement stuM)
    {
        this.stuM = stuM;

        double sum = 0; // 一定不要设为整数，否则做除法的时候就为0了
        for(int i = 0; i < 4; i++)
        {
            sum += stuM.levelNum[i];
        }

        angle1 = (stuM.levelNum[0]/sum) * 360;
        angle2 = (stuM.levelNum[1]/sum) * 360;
        angle3 = (stuM.levelNum[2]/sum) * 360;
        angle4 = (stuM.levelNum[3]/sum) * 360;
    }
    public void paintComponent(Graphics g)
    {
        g.drawString("红色 : 不及格", 10, 40);
        g.drawString("绿色 ： 中等", 10, 60);
        g.drawString("蓝色 : 良好", 10, 80);
        g.drawString("橙色 : 优秀", 10, 100);
        g.setColor(Color.red);
        g.fillArc(150, 40, 150, 150, 0, (int)angle1);
        g.setColor(Color.GREEN);
        g.fillArc(150, 40, 150, 150, (int)angle1, (int)angle2);
        g.setColor(Color.BLUE);
        g.fillArc(150, 40, 150, 150, (int)(angle1+angle2), (int)angle3);
        g.setColor(Color.orange);
        g.fillArc(150, 40, 150, 150, (int)(angle1+angle2+angle3), (int)angle4);
    }
}