1、类图：
2、界面和相应的功能。
（1）实现lastdate方法
1 public String LastDate(int year, int month, int day) 2 { 3 String lastdate = null; 4 if(month==3) //2月 5 { 6 if(((year%4==0&&year%100!=0)||year%400==0)) //闰年时的2月 7 { 8 if(day==1) 9 {10 day=29;11 month--;12 }13 else14 {15 day--;16 }17 }18 else19 {20 if(day==1)21 {22 day=28;23 month--;24 }25 else26 {27 day--;28 }29 }30 }31 else if(month==1) //12月份32 {33 if(day==1)34 {35 year--; 36 day=31;37 month=12;38 }39 else40 {41 day--;42 }43 }44 //一般月份45 else46 {47 if(month==5||month==7||month==10||month==12)48 { 49 if(day==1)50 {51 month--;52 day=30;53 }54 else55 {56 day--;57 }58 }59 else60 {61 if(day==1)62 {63 month--;64 day=31;65 }66 else67 {68 day--;69 }70 }71 }72 lastdate = "" + year + "年" + "" + month + "" + "月" + day + "日" ;73 return lastdate;74 } （2）实现weekday方法
1 public int weekDay(int year, int month, int day) 2 { 3 int num = 0; 4 //蔡勒公式 5 if(month==1||month==2) 6 { 7 month+=12; 8 year-=1; 9 }10 int c = year/100;11 year = year - c * 100;12 num = (year + year/4 + c/4 - 2*c + 26*(month + 1) / 10 + day-1)%7 ;13 if(num==0)14 {15 num+=7;16 }17 return num;18 } （3）OK按钮实现功能
1 JButton btnNewButton = new JButton("OK"); 2 btnNewButton.addActionListener(new ActionListener() { 3 public void actionPerformed(ActionEvent e) { 4 Date date = new Date(); 5 String t_y = textField.getText(); 6 String t_m = textField_1.getText(); 7 String t_d = textField_2.getText(); 8 9 int year = Integer.parseInt(t_y);10 int month = Integer.parseInt(t_m);11 int day = Integer.parseInt(t_d);12 String msg1 = date.NextDate(year,month,day);13 String msg2 = date.LastDate(year,month,day);14 int weeki = date.weekDay(year,month,day);15 String msg = null;16 msg = date.Check(year, month, day);17 if(msg!=null)18 {19 JOptionPane.showMessageDialog(null, msg, "警告！", JOptionPane.ERROR_MESSAGE);20 textField.setText("");21 textField_1.setText("");22 textField_2.setText("");23 textField_3.setText("");24 textField_4.setText("");25 textField_5.setText("");26 }27 else28 {29 textField_4.setText(msg1);30 textField_5.setText(msg2);31 textField_3.setText(String.valueOf(weeki));32 } 33 }34 }35 );36 37 btnNewButton.setBounds(97, 158, 113, 27);38 getContentPane().add(btnNewButton); （4）限制输入只能是数字
1 textField.addKeyListener(new KeyAdapter(){ 2 public void keyTyped(KeyEvent e) { 3 int keyChar = e.getKeyChar(); 4 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 5 6 }else{ 7 e.consume(); //关键，屏蔽掉非法输入 8 } 9 } 10 }); 11 12 textField_1.addKeyListener(new KeyAdapter(){ 13 public void keyTyped(KeyEvent e) { 14 int keyChar = e.getKeyChar(); 15 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 16 17 }else{ 18 e.consume(); //关键，屏蔽掉非法输入 19 } 20 } 21 }); 22 23 textField_2.addKeyListener(new KeyAdapter(){ 24 public void keyTyped(KeyEvent e) { 25 int keyChar = e.getKeyChar(); 26 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 27 28 }else{ 29 e.consume(); //关键，屏蔽掉非法输入 30 } 31 } 32 }); （5）Cancle按钮的功能
1 JButton btnNewButton_1 = new JButton("Cancle"); 2 btnNewButton_1.addActionListener(new ActionListener() { 3 public void actionPerformed(ActionEvent e) { 4 textField.setText(""); 5 textField_1.setText(""); 6 textField_2.setText(""); 7 textField_3.setText(""); 8 textField_4.setText(""); 9 textField_5.setText("");10 }11 });12 btnNewButton_1.setBounds(331, 158, 113, 27);13 getContentPane().add(btnNewButton_1); （6）全部代码：
功能：
1 public class Date { 2 public String Check(int year, int month, int day) 3 { 4 String msg = null; 5 if((year<1912||year>2050)) //判断年份是否超出 6 { 7 msg = "输入有误，请重新输入！"; 8 return msg; 9 } 10 if((month<1||month>12)) // 判断月份是否超出 11 { 12 msg += "输入有误，请重新输入！"; 13 return msg; 14 } 15 //判断日期是否超出 16 if(month==4||month==6||month==9||month==11) 17 { 18 if((day<1||day>30)) 19 { 20 msg += "输入有误，请重新输入！"; 21 return msg; 22 } 23 } 24 else if(month==2) 25 { 26 if((year%4==0&&year%100!=0)||year%400==0)//闰年 27 { 28 if((day<1||day>29)) 29 { 30 msg += "输入有误，请重新输入！"; 31 return msg; 32 } 33 } 34 else //非闰年 35 { 36 if((day<1||day>28)) 37 { 38 msg += "输入有误，请重新输入！"; 39 return msg; 40 } 41 } 42 } 43 else 44 { 45 if((day<1||day>31)) 46 { 47 msg += "输入有误，请重新输入！"; 48 return msg; 49 } 50 } 51 return msg; 52 } 53 54 public String NextDate(int year, int month, int day) 55 { 56 57 String nextdate; 58 if(month==2) //2月 59 { 60 if(((year%4==0&&year%100!=0)||year%400==0)) //闰年时的2月 61 { 62 if(day==29) 63 { 64 day=1; 65 month++; 66 } 67 else 68 { 69 day++; 70 } 71 } 72 else 73 { 74 if(day==28) 75 { 76 day=1; 77 month++; 78 } 79 else 80 { 81 day++; 82 } 83 } 84 } 85 else if(month==12) //12月份 86 { 87 if(day==31) 88 { 89 year++; 90 day=1; 91 month=1; 92 } 93 else 94 { 95 day++; 96 } 97 } 98 //一般月份 99 else100 {101 if(month==4||month==6||month==9||month==11)102 { 103 if(day==30)104 {105 month++;106 day=1;107 }108 else109 {110 day++;111 }112 }113 else114 {115 if(day==31)116 {117 month++;118 day=1;119 }120 else121 {122 day++;123 }124 }125 }126 nextdate = "" + year + "年" + "" + month + "" + "月" + day + "日" ;127 return nextdate;128 }129 130 public String LastDate(int year, int month, int day)131 {132 String lastdate = null;133 if(month==3) //2月134 {135 if(((year%4==0&&year%100!=0)||year%400==0)) //闰年时的2月136 { 137 if(day==1)138 {139 day=29;140 month--;141 }142 else143 {144 day--;145 }146 }147 else148 {149 if(day==1)150 {151 day=28;152 month--;153 }154 else155 {156 day--;157 }158 }159 }160 else if(month==1) //12月份161 {162 if(day==1)163 {164 year--; 165 day=31;166 month=12;167 }168 else169 {170 day--;171 }172 }173 //一般月份174 else175 {176 if(month==5||month==7||month==10||month==12)177 { 178 if(day==1)179 {180 month--;181 day=30;182 }183 else184 {185 day--;186 }187 }188 else189 {190 if(day==1)191 {192 month--;193 day=31;194 }195 else196 {197 day--;198 }199 }200 }201 lastdate = "" + year + "年" + "" + month + "" + "月" + day + "日" ;202 return lastdate;203 }204 205 public int weekDay(int year, int month, int day)206 {207 int num = 0;208 //蔡勒公式209 if(month==1||month==2)210 {211 month+=12;212 year-=1;213 }214 int c = year/100;215 year = year - c * 100;216 num = (year + year/4 + c/4 - 2*c + 26*(month + 1) / 10 + day-1)%7 ;217 if(num==0)218 {219 num+=7;220 }221 return num;222 }223 } 界面：
1 import java.awt.EventQueue; 2 import java.awt.event.ActionEvent; 3 import java.awt.event.ActionListener; 4 import java.awt.event.KeyAdapter; 5 import java.awt.event.KeyEvent; 6 7 import javax.swing.JButton; 8 import javax.swing.JFrame; 9 10 import javax.swing.JLabel; 11 import javax.swing.JOptionPane; 12 import javax.swing.JTextField; 13 14 public class ruance_1 extends JFrame { 15 private JTextField textField; 16 private JTextField textField_1; 17 private JTextField textField_2; 18 private JTextField textField_3; 19 private JTextField textField_4; 20 private JTextField textField_5; 21 public ruance_1() { 22 setTitle("\u65E5\u671F\u8BA1\u7B97\u7A0B\u5E8F"); 23 getContentPane().setLayout(null); 24 25 JLabel lblNewLabel = new JLabel("\u8BF7\u8F93\u5165\u9700\u8981\u8BA1\u7B97\u7684\u5E74\u6708\u65E5(\u6700\u597D\u662F\u6570\u5B57)\uFF1A"); 26 lblNewLabel.setBounds(88, 31, 287, 18); 27 getContentPane().add(lblNewLabel); 28 29 JLabel lblNewLabel_1 = new JLabel("\u5E74\uFF1A"); 30 lblNewLabel_1.setBounds(14, 79, 30, 18); 31 getContentPane().add(lblNewLabel_1); 32 33 textField = new JTextField(); 34 textField.setBounds(44, 76, 86, 24); 35 getContentPane().add(textField); 36 textField.setColumns(10); 37 38 JLabel lblNewLabel_2 = new JLabel("\u6708\uFF1A"); 39 lblNewLabel_2.setBounds(193, 79, 30, 18); 40 getContentPane().add(lblNewLabel_2); 41 42 textField_1 = new JTextField(); 43 textField_1.setBounds(224, 76, 86, 24); 44 getContentPane().add(textField_1); 45 textField_1.setColumns(10); 46 47 JLabel lblNewLabel_3 = new JLabel("\u65E5\uFF1A"); 48 lblNewLabel_3.setBounds(372, 79, 30, 18); 49 getContentPane().add(lblNewLabel_3); 50 51 textField_2 = new JTextField(); 52 textField_2.setBounds(402, 76, 86, 24); 53 getContentPane().add(textField_2); 54 textField_2.setColumns(10); 55 56 textField.addKeyListener(new KeyAdapter(){ 57 public void keyTyped(KeyEvent e) { 58 int keyChar = e.getKeyChar(); 59 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 60 61 }else{ 62 e.consume(); //关键，屏蔽掉非法输入 63 } 64 } 65 }); 66 67 textField_1.addKeyListener(new KeyAdapter(){ 68 public void keyTyped(KeyEvent e) { 69 int keyChar = e.getKeyChar(); 70 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 71 72 }else{ 73 e.consume(); //关键，屏蔽掉非法输入 74 } 75 } 76 }); 77 78 textField_2.addKeyListener(new KeyAdapter(){ 79 public void keyTyped(KeyEvent e) { 80 int keyChar = e.getKeyChar(); 81 if(keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9){ 82 83 }else{ 84 e.consume(); //关键，屏蔽掉非法输入 85 } 86 } 87 }); 88 89 JButton btnNewButton = new JButton("OK"); 90 btnNewButton.addActionListener(new ActionListener() { 91 //判断字符串是否为数字 92 // public boolean isInteger(String value) { 93 // try { 94 // Integer.parseInt(value); 95 // return true; 96 // } catch (NumberFormatException e) { 97 // return false; 98 // } 99 // }100 public void actionPerformed(ActionEvent e) {101 Date date = new Date();102 String t_y = textField.getText();103 String t_m = textField_1.getText();104 String t_d = textField_2.getText();105 106 int year = Integer.parseInt(t_y);107 int month = Integer.parseInt(t_m);108 int day = Integer.parseInt(t_d);109 String msg1 = date.NextDate(year,month,day);110 String msg2 = date.LastDate(year,month,day);111 int weeki = date.weekDay(year,month,day);112 String msg = null;113 msg = date.Check(year, month, day);114 if(msg!="")115 {116 JOptionPane.showMessageDialog(null, msg, "警告！", JOptionPane.ERROR_MESSAGE);117 textField.setText("");118 textField_1.setText("");119 textField_2.setText("");120 textField_3.setText("");121 textField_4.setText("");122 textField_5.setText("");123 }124 else125 {126 textField_4.setText(msg1);127 textField_5.setText(msg2);128 textField_3.setText(String.valueOf(weeki));129 } 130 }131 }132 );133 134 btnNewButton.setBounds(97, 158, 113, 27);135 getContentPane().add(btnNewButton);136 137 JButton btnNewButton_1 = new JButton("Cancle");138 btnNewButton_1.addActionListener(new ActionListener() {139 public void actionPerformed(ActionEvent e) {140 textField.setText("");141 textField_1.setText("");142 textField_2.setText("");143 textField_3.setText("");144 textField_4.setText("");145 textField_5.setText("");146 }147 });148 btnNewButton_1.setBounds(331, 158, 113, 27);149 getContentPane().add(btnNewButton_1);150 151 JLabel label = new JLabel("\u8FD9\u5929\u662F\u661F\u671F\uFF1A");152 label.setBounds(92, 261, 118, 18);153 getContentPane().add(label);154 155 JLabel label_1 = new JLabel("\u4E0B\u4E00\u5929\u662F\uFF1A");156 label_1.setBounds(97, 314, 118, 18);157 getContentPane().add(label_1);158 159 JLabel label_2 = new JLabel("\u4E0A\u4E00\u5929\u662F\uFF1A");160 label_2.setBounds(97, 364, 129, 18);161 getContentPane().add(label_2);162 163 textField_3 = new JTextField();164 textField_3.setColumns(10);165 textField_3.setBounds(193, 258, 86, 24);166 getContentPane().add(textField_3);167 168 textField_4 = new JTextField();169 textField_4.setColumns(10);170 textField_4.setBounds(193, 311, 168, 24);171 getContentPane().add(textField_4);172 173 textField_5 = new JTextField();174 textField_5.setColumns(10);175 textField_5.setBounds(193, 361, 168, 24);176 getContentPane().add(textField_5);177 this.setVisible(true);178 this.setSize(619, 503);179 this.setLocation(300, 200);180 }181 182 public static void main(String[] args) {183 EventQueue.invokeLater(new Runnable() {184 public void run() {185 try {186 ruance_1 frame = new ruance_1();187 frame.setVisible(true);188 } catch (Exception e) {189 e.printStackTrace();190 }191 }192 });193 }194 }
3、效果图：
