考试分数分布统计程序

//考试分数分布统计程序
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

@SuppressWarnings("serial")
public class Score extends JFrame {

private JPanel inputPanel = new JPanel();
private PiePanel piePanel = new PiePanel();
private JLabel labelRed = new JLabel("不及格(60以下）");
private JLabel labelYellow = new JLabel("优秀(100-90）");
private JLabel labelGreen = new JLabel("良好（89-75）");
private JLabel labelBlue = new JLabel("中等（74-60）");
private JLabel labelName = new JLabel("学号：");
private JLabel labelScore = new JLabel("分数：");
private JTextField inputName = new JTextField(10);
private JTextField inputScore = new JTextField(10);
private JTextArea textArea = new JTextArea(20, 16);
private JScrollPane scrollPane = new JScrollPane(textArea);
private JButton inputButton = new JButton("输入");
private int ia = 0, ib = 0, ic = 0, id = 0;

public Score() {
initComponents();// 初始化GUI组件
}

private void initComponents() {
setSize(400, 300);// 设置框架大小
setTitle("分数统计");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
inputPanel.add(labelName);
inputPanel.add(inputName);
inputPanel.add(labelScore);
inputPanel.add(inputScore);
inputPanel.add(inputButton);
inputButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
inputData(inputName.getText(), Double.parseDouble(inputScore
.getText()));
}
});
labelYellow.setForeground(Color.YELLOW);
labelGreen.setForeground(Color.GREEN);
labelBlue.setForeground(Color.BLUE);
labelRed.setForeground(Color.RED);
piePanel.add(labelYellow);
piePanel.add(labelGreen);
piePanel.add(labelBlue);
piePanel.add(labelRed);
piePanel.setBackground(Color.GRAY);
getContentPane().add(inputPanel, "North");
getContentPane().add(scrollPane, "West");
getContentPane().add(piePanel, "Center");
textArea.append("姓名/t分数/n");
}

private void inputData(String name, double score) {
textArea.append(name + ":/t  " + score + "/n");
if (score >= 90) {
ia++;
} else if ((score >= 75)) {
ib++;
} else if ((score >= 60)) {
ic++;
} else {
id++;
}
int sum = (ia + ib + ic + id);// 输入的人数汇总
piePanel.a = 360 * ia / sum;
piePanel.b = 360 * ib / sum;
piePanel.c = 360 * ic / sum;
piePanel.d = 360 * id / sum;
piePanel.repaint();

}

public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Score().setVisible(true);
}
});
}
}

@SuppressWarnings("serial")
class PiePanel extends JPanel {

public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.YELLOW);
g.fillArc(x, y, w, w, 0, a);// 绘制饼图的“优秀”弧段
g.setColor(Color.GREEN);
g.fillArc(x, y, w, w, a, b);// 绘制饼图的“良好”弧段
g.setColor(Color.BLUE);
g.fillArc(x, y, w, w, a + b, c);// 绘制饼图的“中等”弧段
g.setColor(Color.red);
g.fillArc(x, y, w, w, a + b + c, d);// 绘制饼图的“不及格”弧段

}

int a = 90, b = 90, c = 90, d = 90;// 初始化均匀分布
int x = 20, y = 50, w = 160;
}