本文实例为大家分享了Java实现窗体程序显示日历的具体代码，供大家参考，具体内容如下
实训要求：
代码：
Test类：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame {
JButton week1, week2, week3, week4, week5, week6, week7, next, pro;
CalendaBean cb = new CalendaBean();
JLabel[] label;
JLabel now;
public static void main(String[] args) {
Test frame = new Test();
frame.setBounds(650,300,550,550);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("日历");
frame.setVisible(true);
}
public Test() {
int year, month;
setLayout(new BorderLayout());
JPanel pNorth = new JPanel();
cb = new CalendaBean();
cb.setYear(2017);
cb.setMonth(11);
String[] a = cb.getCalendar();
next = new JButton("上月");
pro = new JButton("下月");
next.setActionCommand("lastmonth");
pro.setActionCommand("nextmonth");
next.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cb.actionPerformed(e);
}
});
pro.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cb.actionPerformed(e);
}
});
pNorth.add(next);
pNorth.add(pro);
add(pNorth, BorderLayout.NORTH);
GridLayout grid = new GridLayout(8, 7);
JPanel pCenter = new JPanel();
week1 = new JButton("日");
week2 = new JButton("一");
week3 = new JButton("二");
week4 = new JButton("三");
week5 = new JButton("四");
week6 = new JButton("五");
week7 = new JButton("六");
pCenter.add(week1);
pCenter.add(week2);
pCenter.add(week3);
pCenter.add(week4);
pCenter.add(week5);
pCenter.add(week6);
pCenter.add(week7);
label = new JLabel[42];
for (int i = 0; i < 42; i++) {
label[i] = new JLabel();
pCenter.add(label[i]);
}
cb.label = this.label;
for (int i = 0; i < a.length; i++) {
if (i % 7 == 0) {
label[i].setText("");
}
label[i].setText(" "+a[i]);
}
pCenter.setLayout(grid);
add(pCenter, BorderLayout.CENTER);
JPanel pSouth = new JPanel();
now = new JLabel();
now.setText("日历:" + cb.year + "年" + cb.month + "月");
cb.now = now;
pSouth.add(now);
add(pSouth, BorderLayout.SOUTH);
}
} CalendaBean类：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import javax.swing.*;
public class CalendaBean implements ActionListener {
JLabel[] label;
JLabel now;
String[] day;
int year = 0, month = 0;
public void setYear(int year) {
this.year = year;
}
public void setMonth(int month) {
this.month = month;
}
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();
if (str.equals("lastmonth")) {
month--;
if (month == 0) {
month = 12;
year--;
}
}
else if (str.equals("nextmonth")) {
month++;
if (month == 13) {
month = 1;
year++;
}
}
now.setText("日历:" + year + "年" + month + "月");
String[] a = getCalendar();
for (int i = 0; i < a.length; i++) {
if (i % 7 == 0) {
label[i].setText("");
}
label[i].setText(" "+a[i]);
}
}
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;
else
day = 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;
}
} 运行结果:
小结：
学习了Calendar类，其他的，界面的话顺着来就好。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
