1、類圖：

2、代碼：

（1）計算類：

class Arithmetic{
　　//邏輯計算類
    private int headphoneNum;
    private int mpShellNum;
    private int csProtectorNum;
    
    public Arithmetic(int hp, int ms, int cp) {
        this.headphoneNum = hp;
        this.mpShellNum = ms;
        this.csProtectorNum = cp;
    }
    public
 
 float commission(){
        int total = headphoneNum*80+mpShellNum*10+csProtectorNum*8;
        float commission = 0;
        if(total<1000){
            commission = (float) (total*0.1);
        }else if(total>=1000 && total<=1800){
            commission = (float) (1000*0.1+(total-1000)*0.15);
        }
 
else if(total>1800){
            commission = (float) (1000*0.1+800*0.15+(total-1800)*0.2);
        }
        return commission;
    }
    public String mostSale(){
        StringBuilder mSale = new StringBuilder("耳機 ");
        int max = headphoneNum;
        if (max < mpShellNum) {
            mSale.replace(
 
0, mSale.length(), "手機殼 ");
            max = mpShellNum;
        }else if(max == mpShellNum){
            mSale.append("手機殼 ");
        }
        if (max < csProtectorNum) {
            mSale.replace(0, mSale.length(), "貼膜 ");
            max = mpShellNum;
        }else if(max == csProtectorNum){
            mSale.append("貼膜 ");
        }
        return mSale.toString();
    }
    public int diffSale(){
        int[] goods = {headphoneNum,mpShellNum,csProtectorNum};
        for (int i = 0, len = goods.length; i < len; i++) {
            for (int j = i+1; j < len; j++) {
                if (goods[i] < goods[j]) {
                    int min = goods[i];
                    goods[i] = goods[j];
                    goods[j] = min;
                }
            }
        }
        int dSale = goods[0]-goods[2];
        return dSale;
    }
}

（2）界面類：

class ActionHandle{
　　//界面設計類
    private JFrame frame = new JFrame("手機配件傭金計算器");
    private JLabel infoLab = new JLabel("請輸入銷售數量: ");
    private JLabel headphoneLab = new JLabel("耳機: ");
    private JLabel mpShellLab = new JLabel("手機殼: ");
    private JLabel csProtectorLab = new JLabel("貼膜: ");
    private JLabel refundLab = new JLabel("應返還的傭金: ");
    private JLabel mostSaleLab = new JLabel("銷售額最高的配件是: ");
    private JLabel diffSaleLab = new JLabel("銷售配件最多與最少數量相差: ");
    private JTextField headphoneFie = new JTextField();
    private JTextField mpShellFie = new JTextField();
    private JTextField csProtectorFie = new JTextField();
    private JTextField refundFie = new JTextField();
    private JTextField mostSaleFie = new JTextField();
    private JTextField diffSaleFie = new JTextField();
    private JButton submit = new JButton("OK");
    private JButton reset = new JButton("reset");
    
    public ActionHandle() {
        Font fnt = new Font("Serirf",Font.BOLD,12);
        
        frame.setLayout(null);
        infoLab.setFont(fnt);
        
　　　　　　//submit按鍵監聽方法
        submit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (e.getSource()==submit) {
                    String headphoneNumStr = new String(headphoneFie.getText());
                    String mpShellNumStr = new String(mpShellFie.getText());
                    String csProtectorNumStr = new String(csProtectorFie.getText());
                    try {
                        int headphoneNumInt = Integer.parseInt(headphoneNumStr);
                        int mpShellNumInt = Integer.parseInt(mpShellNumStr);
                        int csProtectorNumInt = Integer.parseInt(csProtectorNumStr);
                        
                        Arithmetic arithmetic = new Arithmetic(headphoneNumInt, mpShellNumInt, csProtectorNumInt);
                        
                        refundFie.setText(String.valueOf(arithmetic.commission()));
                        mostSaleFie.setText(arithmetic.mostSale());
                        diffSaleFie.setText(String.valueOf(arithmetic.diffSale()));
                    } catch (NumberFormatException e2) {
                        Toolkit.getDefaultToolkit().beep();
                        JOptionPane.showMessageDialog(null, "輸入數量不滿足要求", "警告", JOptionPane.WARNING_MESSAGE);
                    }
                }
            }
        });

        //reset按鍵監聽方法
        reset.addActionListener(new ActionListener() {
            
            public void actionPerformed(ActionEvent e) {
                if (e.getSource()==reset) {
                    headphoneFie.setText("");
                    mpShellFie.setText("");
                    csProtectorFie.setText("");
                    refundFie.setText("");
                    mostSaleFie.setText("");
                    diffSaleFie.setText("");
                }
            }
        });

        //關閉
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(1);
            }
        });

        //控件位置安排
        infoLab.setBounds(5, 5, 120, 20);
        frame.add(infoLab);
        headphoneLab.setBounds(5, 30, 60, 20);
        headphoneFie.setBounds(65, 30, 60, 20);
        mpShellLab.setBounds(135, 30, 60, 20);
        mpShellFie.setBounds(195, 30, 60, 20);
        csProtectorLab.setBounds(265, 30, 60, 20);
        csProtectorFie.setBounds(325, 30, 60, 20);
        submit.setBounds(50, 60, 90, 20);
        reset.setBounds(190, 60, 90, 20);
        refundLab.setBounds(5, 90, 90, 20);
        refundFie.setBounds(95, 90, 110, 20);
        mostSaleLab.setBounds(5, 120, 130, 20);
        mostSaleFie.setBounds(135, 120, 110, 20);
        diffSaleLab.setBounds(5, 150, 180, 20);
        diffSaleFie.setBounds(185, 150, 60, 20);
        
        frame.add(headphoneLab);
        frame.add(mpShellLab);
        frame.add(csProtectorLab);
        frame.add(refundLab);
        frame.add(mostSaleLab);
        frame.add(diffSaleLab);
        frame.add(headphoneFie);
        frame.add(mpShellFie);
        frame.add(csProtectorFie);
        frame.add(refundFie);
        frame.add(mostSaleFie);
        frame.add(diffSaleFie);
        frame.add(submit);
        frame.add(reset);
        
        frame.setSize(420, 250);
        frame.setVisible(true);
    }
}

（3）執行類：

public class swing {
    public static void main(String[] args) {
        new ActionHandle();
    }
}

3、界面：

第4次作業類測試代碼+105032014045+楊銘河