1、类图：
2、界面和相应的功能
1）不合法输入（为空，不在范围内）：
2）合法输入：
3、代码
1 package swingEdu; 2 import swingEdu.NextDate; 3 import java.awt.EventQueue; 4 5 import javax.swing.JFrame; 6 import javax.swing.JButton; 7 import javax.swing.JOptionPane; 8 9 import javax.swing.JTextField; 10 import javax.swing.JLabel; 11 12 import java.awt.event.ActionListener; 13 import java.awt.event.ActionEvent; 14 15 public class calculator { 16 17 private JFrame frame; 18 private JTextField input_year; 19 private JTextField today_week; 20 private JTextField nextday_week; 21 private JTextField lastday_week; 22 private JTextField input_month; 23 private JTextField input_day; 24 private int inputYear; 25 private int inputMonth; 26 private int inputDay; 27 28 29 /** 30 * Launch the application. 31 */ 32 public static void main(String[] args) { 33 EventQueue.invokeLater(new Runnable() { 34 public void run() { 35 try { 36 calculator window = new calculator(); 37 window.frame.setVisible(true); 38 } catch (Exception e) { 39 e.printStackTrace(); 40 } 41 } 42 }); 43 } 44 45 /** 46 * Create the application. 47 */ 48 public calculator() { 49 initialize(); 50 } 51 52 /** 53 * Initialize the contents of the frame. 54 */ 55 private void initialize() { 56 frame = new JFrame(); 57 frame.setTitle("日期计算程序"); 58 frame.setBounds(100, 100, 450, 300); 59 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 60 frame.getContentPane().setLayout(null); 61 62 JLabel lblNewLabel = new JLabel("请输入需要计算的年月日:"); 63 lblNewLabel.setBounds(8, 6, 159, 28); 64 frame.getContentPane().add(lblNewLabel); 65 66 input_year = new JTextField(); 67 input_year.setBounds(54, 41, 81, 28); 68 frame.getContentPane().add(input_year); 69 input_year.setColumns(10); 70 71 input_month = new JTextField(); 72 input_month.setBounds(187, 40, 83, 29); 73 frame.getContentPane().add(input_month); 74 input_month.setColumns(10); 75 76 input_day = new JTextField(); 77 input_day.setBounds(320, 43, 92, 22); 78 frame.getContentPane().add(input_day); 79 input_day.setColumns(10); 80 81 JLabel label = new JLabel("年:"); 82 label.setBounds(29, 46, 35, 19); 83 frame.getContentPane().add(label); 84 85 JLabel label_1 = new JLabel("月:"); 86 label_1.setBounds(158, 46, 65, 19); 87 frame.getContentPane().add(label_1); 88 89 JLabel label_2 = new JLabel("日:"); 90 label_2.setBounds(295, 47, 61, 16); 91 frame.getContentPane().add(label_2); 92 93 JButton calculate = new JButton("OK"); 94 calculate.addActionListener(new ActionListener() { 95 public void actionPerformed(ActionEvent e) { 96 NextDate nextdate = new NextDate(); 97 nextday_week.setText(""); 98 today_week.setText(""); 99 lastday_week.setText(""); 100 if (input_year.getText().length() == 0) { 101 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "年份错误提示", 102 JOptionPane.ERROR_MESSAGE); 103 return; 104 }else if (input_month.getText().length() == 0) { 105 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "月份错误提示", 106 JOptionPane.ERROR_MESSAGE); 107 return; 108 }else if (input_day.getText().length() == 0) { 109 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", 110 "日期错误提示", JOptionPane.ERROR_MESSAGE); 111 return; 112 }else { 113 inputYear=Integer.parseInt(input_year.getText()); 114 inputMonth=Integer.parseInt(input_month.getText()); 115 inputDay=Integer.parseInt(input_day.getText()); 116 String nextDayResult=nextdate.nextdate(inputMonth, inputDay, inputYear); 117 if (nextDayResult.contains("超出范围")) { 118 JOptionPane.showMessageDialog(null, nextDayResult, 119 "计算错误提示", JOptionPane.ERROR_MESSAGE); 120 input_year.setText(""); 121 input_month.setText(""); 122 input_day.setText(""); 123 return; 124 } else { 125 nextday_week.setText(nextDayResult); 126 } 127 String lastDayResult=nextdate.lastDay(inputMonth, inputDay, inputYear); 128 if (lastDayResult.contains("超出范围")) { 129 JOptionPane.showMessageDialog(null, nextDayResult, 130 "计算错误提示", JOptionPane.ERROR_MESSAGE); 131 input_year.setText(""); 132 input_month.setText(""); 133 input_day.setText(""); 134 return; 135 } else { 136 lastday_week.setText(lastDayResult); 137 } 138 int weekDayResult=nextdate.weekDay(inputMonth, inputDay, inputYear); 139 today_week.setText(weekDayResult+""); 140 } 141 142 } 143 }); 144 calculate.setBounds(102, 81, 65, 29); 145 frame.getContentPane().add(calculate); 146 147 JButton reset = new JButton("Cancel"); 148 reset.addActionListener(new ActionListener() { 149 public void actionPerformed(ActionEvent e) { 150 input_year.setText(""); 151 input_month.setText(""); 152 input_day.setText(""); 153 154 } 155 }); 156 reset.setBounds(232, 81, 72, 29); 157 frame.getContentPane().add(reset); 158 159 JLabel lblNewLabel_1 = new JLabel("这天是星期:"); 160 lblNewLabel_1.setBounds(102, 128, 92, 16); 161 frame.getContentPane().add(lblNewLabel_1); 162 163 today_week = new JTextField(); 164 today_week.setBounds(179, 122, 134, 28); 165 frame.getContentPane().add(today_week); 166 today_week.setColumns(10); 167 168 JLabel lblNewLabel_2 = new JLabel("下一天是:"); 169 lblNewLabel_2.setBounds(102, 174, 72, 16); 170 frame.getContentPane().add(lblNewLabel_2); 171 172 JLabel label_3 = new JLabel("上一天是:"); 173 label_3.setBounds(102, 220, 61, 16); 174 frame.getContentPane().add(label_3); 175 176 nextday_week = new JTextField(); 177 nextday_week.setBounds(179, 168, 134, 28); 178 frame.getContentPane().add(nextday_week); 179 nextday_week.setColumns(10); 180 181 lastday_week = new JTextField(); 182 lastday_week.setBounds(179, 214, 134, 28); 183 frame.getContentPane().add(lastday_week); 184 lastday_week.setColumns(10); 185 186 } 187 188 189 }
1 package swingEdu; 2 3 public class NextDate { 4 5 //nextdate函数 计算下一天 6 public String nextdate(int month,int day,int year){ 7 int isleap[]={31,29,31,30,31,30,31,31,30,31,30,31}; 8 int noleap[]={31,28,31,30,31,30,31,31,30,31,30,31}; 9 int m,d,y; 10 11 if (month<1 || month>12){ 12 return "月份超出范围"; 13 } 14 if (day<1 || day>31){ 15 return "日期超出范围"; 16 } 17 if (year<1912 || year>2050){ 18 return "年份超出范围"; 19 } 20 21 if ((year%4==0 && year%100!=0) || year%400==0){//闰年 22 if (day<isleap[month-1]){ 23 d = day+1; 24 m = month; 25 y = year; 26 } 27 else if (day==isleap[month-1]){//该月的最后一天 28 d=1; 29 if (month==12){//一年的最后一天 30 m = 1; 31 y = year+1; 32 } 33 else{ 34 m = month+1; 35 y = year; 36 } 37 } 38 else{//针对31天以内，但是超出该月最大天数 39 return "日期超出范围"; 40 } 41 } 42 43 else{//非闰年 44 if (day<noleap[month-1]){ 45 d = day+1; 46 m = month; 47 y = year; 48 } 49 else if (day==noleap[month-1]){//该月的最后一天 50 d = 1; 51 if (month==12){//一年的最后一天 52 m = 1; 53 y = year+1; 54 } 55 else{ 56 m = month+1; 57 y = year; 58 } 59 } 60 else{//针对31天以内，但是超出该月最大天数 61 return "日期超出范围"; 62 } 63 } 64 return y + "年" + m + "月" + d + "日"; 65 } 66 67 //lastDay函数 计算上一天 68 public String lastDay(int month,int day,int year) 69 { 70 int isleap[]={31,29,31,30,31,30,31,31,30,31,30,31}; 71 int noleap[]={31,28,31,30,31,30,31,31,30,31,30,31}; 72 int m,d,y; 73 74 if (month<1 || month>12){ 75 return "月份超出范围"; 76 } 77 if (day<1 || day>31){ 78 return "日期超出范围"; 79 } 80 if (year<1912 || year>2050){ 81 return "年份超出范围"; 82 } 83 84 if(month==1 && day==1){ 85 y = year -1; 86 m = 12; 87 d = 31; 88 }else if(day==1){ 89 y = year; 90 m = month - 1; 91 if((year%4==0 && year%100!=0) || year%400==0){//闰年 92 d = isleap[m-1]; 93 } 94 else{//非闰年 95 d = noleap[m-1]; 96 } 97 }else{ 98 y = year; 99 m = month; 100 d = day - 1; 101 } 102 103 return y + "年" + m + "月" + d + "日"; 104 } 105 106 //weekDay函数 计算星期几 107 public int weekDay(int month,int day,int year){ 108 int iweek = 0; 109 int y = 0, c = 0, m = 0, d = 0; 110 111 if(month == 1 || month == 2) 112 { 113 c = (year - 1) / 100; 114 y = (year - 1) % 100; 115 m = month + 12; 116 d = day; 117 } 118 else 119 { 120 c = year / 100; 121 y = year % 100; 122 m = month; 123 d = day; 124 } 125 126 iweek = y + y/4 + c/4 - 2*c + 26*(m+1)/10 + d - 1; //泰勒公式 127 iweek = iweek >= 0 ? (iweek % 7) : (iweek % 7 + 7); 128 if(iweek == 0) 129 { 130 iweek = 7; 131 } 132 133 return iweek; 134 } 135 }