Java 实训1：编写一个窗体程序显示日历表。

 实训!要求:
1.简单实现日历功能，能查看前月后月的日历功能。

2.使用JTable 组件显示日历。

参考结果：

代码：

CalendaBean.java

import java.util.Calendar;public class CalendaBean {Test test;String[] day;int year = 2017, month = 7;public void setYear(int year) {this.year = year;}public void setMonth(int month) {this.month = month;}public int Last() {month--;if (month == 0) {month = 12;year--;}return month;}public int Next() {month++;if (month == 13) {month = 1;year++;}return month;}public String[] getCalendar() {String[] a = new String[42];Calendar rili = Calendar.getInstance();rili.set(year, month - 1, 1);int weekDay = rili.get(Calendar.DAY_OF_WEEK) - 1;int day = 0;if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8|| month == 10 || month == 12) {day = 31;}if (month == 4 || month == 6 || month == 9 || month == 11) {day = 30;}if (month == 2) {if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))day = 29;elseday = 28;}for (int i = 0; i < weekDay; i++)a[i] = " ";for (int i = weekDay, n = 1; i < weekDay + day; i++) {a[i] = String.valueOf(n);n++;}for (int i = weekDay + day; i < a.length; i++)a[i] = " ";return a;}}

Change.java

import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JLabel;public class Change implements ActionListener {CalendaBean c;JLabel now;Test test;public void actionPerformed(ActionEvent e) {String str = e.getActionCommand();if (str.equals("lastmonth")) {c.Last();} else if (str.equals("nextmonth")) {c.Next();}test.Rili();now.setText("日历 :" + c.year + "年" + c.month + "月");}}

Test.java

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.table.DefaultTableModel;public class Test extends JFrame {JButton bx, by;CalendaBean cb = new CalendaBean();Change change = new Change();DefaultTableModel model;String[] label;JLabel now;JTable table = new JTable();JScrollPane pane = new JScrollPane();Object[] columnNames = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };Object[][] rowData = { { null, null, null, null, null, null, null },{ null, null, null, null, null, null, null },{ null, null, null, null, null, null, null },{ null, null, null, null, null, null, null },{ null, null, null, null, null, null, null },{ null, null, null, null, null, null, null }, };public static void main(String[] args) {Test frame = new Test();frame.setSize(500, 400);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setTitle("日历");frame.setVisible(true);}public Test() {change.test = this;int year, month;setLayout(new BorderLayout());JPanel pNorth = new JPanel();cb = new CalendaBean();change.c = cb;bx = new JButton("上月");by = new JButton("下月");bx.setActionCommand("lastmonth");by.setActionCommand("nextmonth");bx.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {change.actionPerformed(e);}});by.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {change.actionPerformed(e);}});pNorth.add(bx);pNorth.add(by);Rili();model = new DefaultTableModel(rowData, columnNames);table = new JTable(model);table.setRowHeight(38);table.getTableHeader().setResizingAllowed(false);pane = new JScrollPane(table);JPanel pSouth = new JPanel();now = new JLabel();now.setText("日历:" + cb.year + "年" + cb.month + "月");change.now = now;pSouth.add(now);add(pNorth, BorderLayout.NORTH);add(pane, BorderLayout.CENTER);add(pSouth, BorderLayout.SOUTH);}public void Rili() {String[] a = cb.getCalendar();int x = 0;if (model != null) {model.setRowCount(0);}for (int i = 0; i < 6; i++) {for (int j = 0; j < 7; j++) {rowData[i][j] = a[x];x++;}if (model != null)model.addRow(rowData[i]);}}}

运行结果

说明：这个程序与前几天上传的日历显示表差不多，只是改了中间的组件，原本以为是很简单的事，结果做的时候才发现其中的难点，初学Java还有很多不懂的地方，幸好有大神的解答，自己还有很多需要学习的地方。