zoukankan html css js c++ java
复利计算器3.01

  1 此版本的复利计算器对输入的数据进行了限制，只能输入数字字符，并对输入的数据进行判断是否完整
  2 package JSQ;
  3 
  4 import java.awt.EventQueue;
  5 
  6 import javax.swing.JFrame;
  7 import javax.swing.JPanel;
  8 import javax.swing.border.EmptyBorder;
  9 import javax.swing.ButtonGroup;
 10 import javax.swing.JLabel;
 11 import javax.swing.JOptionPane;
 12 import javax.swing.JTextField;
 13 import javax.swing.JButton;
 14 
 15 import java.awt.event.ActionListener;
 16 import java.awt.event.ActionEvent;
 17 import java.awt.event.KeyAdapter;
 18 import java.awt.event.KeyEvent;
 19 import java.awt.Font;
 20 import java.awt.event.MouseAdapter;
 21 import java.awt.event.MouseEvent;
 22 import java.awt.Color;
 23 
 24 import javax.swing.JComboBox;
 25 import javax.swing.DefaultComboBoxModel;
 26 
 27 import java.awt.event.ItemListener;
 28 import java.awt.event.ItemEvent;
 29 
 30 import javax.swing.JRadioButton;
 31 
 32 public class FuLiJiSuanQi extends JFrame {
 33 
 34     /**
 35      * 
 36      */
 37     private static final long serialVersionUID = 1L;
 38     private JPanel contentPane;
 39     private JTextField t2;
 40     private JTextField t3;
 41     private JTextField t1;
 42     private JTextField t4;
 43     private JLabel L3;
 44     double capital,year,rate,sum;
 45     double t_1,t_2,t_3;
 46     int flag=1;
 47     private JRadioButton r1;
 48     private JRadioButton r2;
 49     /**
 50      * Launch the application.
 51      */
 52     public static void main(String[] args) {
 53         EventQueue.invokeLater(new Runnable() {
 54             @Override
 55             public void run() {
 56                 try {
 57                     FuLiJiSuanQi frame = new FuLiJiSuanQi();
 58                     frame.setVisible(true);
 59                 } catch (Exception e) {
 60                     e.printStackTrace();
 61                 }
 62             }
 63         });
 64     }
 65 
 66     /**
 67      * Create the frame.
 68      */
 69     @SuppressWarnings({ "unchecked", "rawtypes" })
 70     public FuLiJiSuanQi() {
 71         setTitle("u590Du5229u8BA1u7B97u56683.0");
 72         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 73         setBounds(100, 100, 474, 369);
 74         contentPane = new JPanel();
 75         contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 76         setContentPane(contentPane);
 77         contentPane.setLayout(null);
 78         
 79         final JLabel L1 = new JLabel("u5B58u6B3E(u4E07):");//存款
 80         L1.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
 81         L1.setBounds(62, 85, 90, 15);
 82         contentPane.add(L1);
 83         
 84         t1 = new JTextField();
 85         t1.setBounds(166, 84, 173, 21);
 86         contentPane.add(t1);
 87         t1.setColumns(10);
 88         t1.addKeyListener(new KeyAdapter(){  
 89             public void keyTyped(KeyEvent e) {  
 90                 int keyChar = e.getKeyChar();                 
 91                 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){  
 92                       
 93                 }else{  
 94                     e.consume(); //关键，屏蔽掉非法输入  
 95                 }  
 96             }  
 97         });  
 98         
 99         L3 = new JLabel("u5229u7387( %):");//利率
100         L3.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
101         L3.setBounds(62, 142, 81, 15);
102         contentPane.add(L3);
103         
104         t2 = new JTextField();
105         t2.setBounds(166, 115, 173, 21);
106         contentPane.add(t2);
107         t2.setColumns(10);
108         t2.addKeyListener(new KeyAdapter(){  
109             public void keyTyped(KeyEvent e) {  
110                 int keyChar = e.getKeyChar();                 
111                 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){  
112                       
113                 }else{  
114                     e.consume();//关键，屏蔽掉非法输入  
115                 }  
116             }  
117         });  
118         
119         final JLabel L2 = new JLabel("u672Cu606F(u4E07):");//年限
120         L2.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
121         L2.setBounds(62, 117, 104, 15);
122         contentPane.add(L2);
123         
124         t3 = new JTextField();
125         t3.setBounds(166, 140, 173, 21);
126         contentPane.add(t3);
127         t3.setColumns(10);
128         t3.addKeyListener(new KeyAdapter(){  
129             public void keyTyped(KeyEvent e) {  
130                 int keyChar = e.getKeyChar();                 
131                 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){  
132                       
133                 }else{  
134                     e.consume(); //关键，屏蔽掉非法输入  
135                 }  
136             }  
137         });  
138         
139         final JButton btnNewButton = new JButton("u5E74u9650(u5E74)");//本息
140         t4 = new JTextField();
141         t4.setEnabled(false);
142         t4.setForeground(new Color(127, 255, 212));
143         t4.setBounds(166, 182, 173, 21);
144         contentPane.add(t4);
145         t4.setColumns(10);
146         final JComboBox comboBox = new JComboBox();
147         comboBox.addItemListener(new ItemListener() {
148             @Override
149             public void itemStateChanged(ItemEvent e) {
150                 if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5B58u671F"))
151                 {
152                     flag=1;
153                     L1.setText("u5B58u6B3E(u4E07):");
154                     L2.setText("u672Cu606F(u4E07):");
155                     L3.setText("u5229u7387(%):");
156                     btnNewButton.setText("u5E74u9650(u5E74)");
157                     t1.setText(null);
158                     t2.setText(null);
159                     t3.setText(null);
160                     t4.setText(null);
161                 }
162                 else if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5B58u989D")) {
163                     flag=2;
164                     L1.setText("u672Cu606F(u4E07)");
165                     L2.setText("u5E74u9650(u5E74):");
166                     L3.setText("u5229u7387(%):");
167                     btnNewButton.setText("u5B58u6B3E(u4E07)");
168                     t1.setText(null);
169                     t2.setText(null);
170                     t3.setText(null);
171                     t4.setText(null);
172                 }
173                 else if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5229u7387")) {
174                     flag=3;
175                     L1.setText("u5B58u6B3E(u4E07):");
176                     L2.setText("u672Cu606F(u4E07):");
177                     L3.setText("u5E74u9650(u5E74):");
178                     btnNewButton.setText("u5229u7387(%)");
179                     t1.setText(null);
180                     t2.setText(null);
181                     t3.setText(null);
182                     t4.setText(null);
183                 }
184                 else {
185                     flag=4;
186                     L1.setText("u5B58u6B3E(u4E07):");
187                     L2.setText("u5E74u9650(u5E74):");
188                     L3.setText("u5229u7387(%):");
189                     btnNewButton.setText("u672Cu606F(u4E07)");
190                     t1.setText(null);
191                     t2.setText(null);
192                     t3.setText(null);
193                     t4.setText(null);
194                 }
195             }
196         });
197         comboBox.setModel(new DefaultComboBoxModel(new String[] {"u4F30u7B97u5B58u671F", "u4F30u7B97u5B58u989D",
198                                                                 "u4F30u7B97u5229u7387", "u4F30u7B97u672Cu606F"}));
199         comboBox.setBounds(53, 10, 90, 21);
200         contentPane.add(comboBox);
201         
202         r1 = new JRadioButton("u5355u5229");
203         r1.setSelected(true);
204         r1.setBounds(6, 37, 64, 23);
205         contentPane.add(r1);
206         
207         r2 = new JRadioButton("u590Du5229");
208         r2.setBounds(72, 37, 70, 23);
209         contentPane.add(r2);
210         ButtonGroup group=new ButtonGroup();
211         group.add(r1);
212         group.add(r2);
213         JLabel L = new JLabel("u529Fu80FD");
214         L.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
215         L.setBounds(10, 13, 54, 15);
216         contentPane.add(L);
217         btnNewButton.addMouseListener(new MouseAdapter() {
218             @Override
219             public void mouseClicked(MouseEvent e) {
220                 if (t1.getText().trim().equals("")||t2.getText().trim().equals("")||t3.getText().trim().equals("")) {
221                     JOptionPane.showMessageDialog(contentPane, "请把数据输入完整");
222                 }
223                 else {
224                     getTitleValue();
225                     if(r1.isSelected()){
226                         calculate();
227                     }
228                     else {
229                         calculate_2();
230                     }
231                 }
232             }
233         });
234         btnNewButton.addActionListener(new ActionListener() {
235             @Override
236             public void actionPerformed(ActionEvent e) {
237             }
238         });
239         btnNewButton.setBounds(53, 181, 90, 23);
240         contentPane.add(btnNewButton);
241     }
242     public void getTitleValue() {
243             t_1=Double.parseDouble(t1.getText());
244             t_2=Double.parseDouble(t2.getText());
245             t_3=Double.parseDouble(t3.getText());
246     };
247     public void calculate() {
248         switch (flag) {
249         case 1:
250             capital=t_1;
251             sum=t_2;
252             rate=t_3;
253             year=(sum/capital-1)/(rate/100);
254             t4.setText(Double.toString(year));
255             break;
256         case 2:
257             sum=t_1;
258             year=t_2;
259             rate=t_3;
260             capital=sum/(year*rate/100+1);
261             t4.setText(Double.toString(capital));
262             break;
263         case 3:
264             capital=t_1;
265             sum=t_2;
266             year=t_3;
267             rate=(sum/capital-1)/year*100;
268             t4.setText(Double.toString(rate));
269             break;
270         case 4:
271             capital=t_1;
272             year=t_2;
273             rate=t_3;
274             sum=capital*(1+rate/100*year);
275             t4.setText(Double.toString(sum));
276             break;
277         default:
278             break;
279         }
280     }
281     public void  calculate_2() {
282         switch (flag) {
283         case 1:
284             capital=t_1;
285             sum=t_2;
286             rate=t_3;
287             year=Math.log(sum/capital)/Math.log(1+rate/100);
288             t4.setText(Double.toString(year));
289             break;
290         case 2:
291             sum=t_1;
292             year=t_2;
293             rate=t_3;
294             capital=sum/Math.pow((1+rate/100),year);
295             t4.setText(Double.toString(capital));
296             break;
297         case 3:
298             capital=t_1;
299             sum=t_2;
300             year=t_3;
301             rate=(Math.pow((sum/capital),1/year)-1)*100;
302             t4.setText(Double.toString(rate));
303             break;
304         case 4:
305             capital=t_1;
306             year=t_2;
307             rate=t_3;
308             sum=capital*Math.pow((1+rate/100),year);
309             t4.setText(Double.toString(sum));
310             break;
311         default:
312             break;
313         }
314     }
315 }
316 
317
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原文地址：https://www.cnblogs.com/LwF39/p/5296744.html