一、类图
二、代码
1 package demo04;
2 import java.awt.event.ActionEvent;
3 import java.awt.event.ActionListener;
4 import java.awt.Color;
5 import java.awt.Font;
6 import javax.swing.JFrame;
7 import javax.swing.JLabel;
8 import javax.swing.JButton;
9 import javax.swing.JTextField;
10 import javax.swing.JOptionPane;
11 public class caculate {
12 public static void main(String args[]){
13 JFrame frame = new JFrame("配件销售计算程序");
14 frame.setLayout(null);
15 //建立标签对象
16 JLabel title = new JLabel("请输入销售数量：");
17 JLabel headphone = new JLabel("耳机：");
18 JLabel shell = new JLabel("手机壳：");
19 JLabel protector = new JLabel("贴膜：");
20 JLabel commission = new JLabel("应返还的佣金：");
21 JLabel mostSale = new JLabel("销售额最高的配件是：");
22 JLabel diffSale = new JLabel("销售配件最多与最少数量相差：");
23 //建立单行文本框
24 JTextField t_headphone = new JTextField();
25 JTextField t_shell = new JTextField();
26 JTextField t_protector = new JTextField();
27 JTextField t_commission = new JTextField();
28 JTextField t_mostSale = new JTextField();
29 JTextField t_diffSale = new JTextField();
30 //建立按钮对象
31 JButton submit = new JButton("确定");
32 JButton cancel = new JButton("清除");
33
34 //使用匿名内部类为“确定”按钮添加监听事件
35 submit.addActionListener(new ActionListener()
36 {
37 @Override
38 public void actionPerformed(ActionEvent arg0)
39 {
40 int headphone = Commission.changeToInt(t_headphone.getText());
41 if(headphone < 0)
42 {
43 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "出错", JOptionPane.ERROR_MESSAGE);
44 return;
45 }
46 int protector=Commission.changeToInt(t_protector.getText());
47 if(protector < 0)
48 {
49 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "出错", JOptionPane.ERROR_MESSAGE);
50 return;
51 }
52 int shell=Commission.changeToInt(t_shell.getText());
53 if(shell < 0)
54 {
55 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "出错", JOptionPane.ERROR_MESSAGE);
56 return;
57 }
58 float returnAns=Commission.commission(headphone, shell, protector);
59 String returnString=String.format("%.2f元", returnAns);
60 t_commission.setText(returnString);
61 String maxAns=Commission.mostSale(headphone, shell, protector);
62 t_mostSale.setText(maxAns);
63 int differenceAns=Commission.diffSale(headphone, shell, protector);
64 String differenceString=String.format("%d", differenceAns);
65 t_diffSale.setText(differenceString);
66 }
67
68 });
69 //使用匿名内部类为“清除”按钮添加监听事件
70 cancel.addActionListener(new ActionListener()
71 {
72 @Override
73 public void actionPerformed(ActionEvent arg0)
74 {
75 t_headphone.setText("");
76 t_protector.setText("");
77 t_shell.setText("");
78 t_commission.setText("");
79 t_mostSale.setText("");
80 t_diffSale.setText("");
81 }
82 });
83 //设置标签大小及位置
84 Font ft = new Font("宋体",Font.BOLD,24);
85 title.setFont(ft);
86 title.setBounds(62, 62, 250, 25);
87 headphone.setFont(ft);
88 headphone.setBounds(80, 124, 300, 25);
89 shell.setFont(ft);
90 shell.setBounds(210, 124, 250, 25);
91 protector.setFont(ft);
92 protector.setBounds(380, 124, 155, 25);
93 commission.setFont(ft);
94 commission.setBounds(62, 248, 500, 25);
95 mostSale.setFont(ft);
96 mostSale.setBounds(62, 310, 900, 25);
97 diffSale.setFont(ft);
98 diffSale.setBounds(62, 372, 1000, 25);
99 //设置文字大小及位置
100 Font fft=new Font("宋体",Font.BOLD,14);
101 t_headphone.setBounds(150, 124, 50, 25);
102 t_shell.setBounds(310, 124, 50, 25);
103 t_protector.setBounds(450, 124, 50, 25);
104 t_commission.setBounds(230, 248, 200, 25);
105 t_commission.setFont(fft);
106 t_commission.setForeground(Color.black);//设置字体颜色
107 t_mostSale.setBounds(300, 310, 200, 25);
108 t_mostSale.setFont(fft);
109 t_mostSale.setForeground(Color.black);
110 t_diffSale.setBounds(400, 372, 150, 25);
111 t_diffSale.setFont(fft);
112 t_diffSale.setForeground(Color.black);
113 //设置按钮位置及大小
114 submit.setBounds(180, 187, 62, 31);
115 cancel.setBounds(320, 187, 62, 31);
116 //把所有组件添加到frame中
117 frame.add(title);frame.add(headphone);frame.add(shell);frame.add(protector);
118 frame.add(commission);frame.add(mostSale);frame.add(diffSale);
119 frame.add(t_headphone);frame.add(t_shell);frame.add(t_protector);
120 frame.add(t_commission);frame.add(t_mostSale);frame.add(t_diffSale);
121 frame.add(submit);frame.add(cancel);
122 //设置显示画布大小及显示的位置
123 frame.setSize(600, 490);
124 frame.setLocation(300,300);
125 frame.setVisible(true);
126 }
127
128 }
package demo04;
public class Commission {
//判断输入的值是否符合要求
public static int changeToInt(String number)
{
int result=0;
try{
result = Integer.parseInt(number);
}
catch (Exception e){
result=-1;
}
return result;
}
//计算应该返还的佣金
public static float commission(int headphone,int shell,int protector)
{
int all = headphone*80+shell*10+protector*8;
float result = 0;
if(headphone>=0&&shell>=0&&protector>=0)
{
if(all<1000&&all>=0)
{
result = (float) (all*0.1);
}
else if(all>=1000 && all<=1800)
{
result = (float) (100+(all-1000)*0.15);
}
else if(all>1800)
{
result = (float) (100+800*0.15+(all-1800)*0.2);
}
}
return result;
}
//计算销售额最高的配件
public static String mostSale(int headphone, int shell, int protector)
{
int headphoneSales = headphone * 80;
int shellSales = shell * 10;
int protectorSales = protector * 8;
String result="";
if(headphoneSales > shellSales && headphoneSales > protectorSales)
{
result+="耳机";
}
if(shellSales > headphoneSales && shellSales > protectorSales)
{
result+="手机壳";
}
if(protectorSales > headphoneSales && protectorSales > shellSales)
{
result+="贴膜";
}
if(headphoneSales==shellSales&&shellSales==protectorSales)
{
result+="三种配件销售额一样";
}
if(headphoneSales==shellSales&&headphoneSales>protectorSales)
{
result+="耳机和手机壳";
}
if(headphoneSales==protector&&headphoneSales>shellSales)
{
result+="耳机和贴膜";
}
if(shellSales==protectorSales&&shellSales>headphoneSales)
{
result+="手机壳和贴膜";
}
return result;
}
//销售配件最多与最少数量相差：
public static int diffSale(int headphone, int shell, int protector){
int max=Math.max(Math.max(headphone, shell), protector);
int min=Math.min(Math.min(headphone, shell), protector);
return max-min;
}
}
三、界面
时间： 2024-12-29 19:34:10