Story of Hyun

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Calendar;

import javax.swing.DefaultComboBoxModel;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class SwingCalendar extends JFrame implements ActionListener{

//North

JPanel topPane = new JPanel();

JButton prevBtn = new JButton("◀");

JButton nextBtn = new JButton("▶");

JLabel yearLbl = new JLabel("년");

JLabel monthLbl = new JLabel("월");

JComboBox<Integer> yearCombo = new JComboBox<Integer>();

DefaultComboBoxModel<Integer> yearModel = new DefaultComboBoxModel<Integer>();

JComboBox<Integer> monthCombo = new JComboBox<Integer>();

DefaultComboBoxModel<Integer> monthModel = new DefaultComboBoxModel<Integer>();

//Center

JPanel centerPane = new JPanel(new BorderLayout());

JPanel titlePane = new JPanel(new GridLayout(1, 7));

String titleStr[] = {"일", "월", "화", "수", "목", "금", "토"};

JPanel datePane = new JPanel(new GridLayout(0, 7));

Calendar now;

int year, month, date;

public SwingCalendar() {

setDefaultCloseOperation(DISPOSE_ON_CLOSE); //자원 해제 후 종료

now = Calendar.getInstance(); //현재 날짜

year = now.get(Calendar.YEAR);

month = now.get(Calendar.MONTH)+1;

date = now.get(Calendar.DATE);

topPane.add(prevBtn);

for(int i=year-100; i<=year+50; i++){

yearModel.addElement(i);

}

yearCombo.setModel(yearModel);

yearCombo.setSelectedItem(year); //현재 년도 선택

topPane.add(yearCombo);

topPane.add(yearLbl);

for(int i=1; i<=12; i++){

monthModel.addElement(i);

}

monthCombo.setModel(monthModel);

monthCombo.setSelectedItem(month); //현재 월 선택

topPane.add(monthCombo);

topPane.add(monthLbl);

topPane.add(nextBtn);

topPane.setBackground(new Color(100, 200, 200));

add(topPane, "North");

//Center

titlePane.setBackground(Color.white);

for(int i=0; i<titleStr.length; i++){

JLabel lbl = new JLabel(titleStr[i], JLabel.CENTER);

if(i == 0){

lbl.setForeground(Color.red);

}else if(i == 6){

lbl.setForeground(Color.blue);

}

titlePane.add(lbl);

}

centerPane.add(titlePane, "North");

//날짜 출력

dayPrint(year, month);

centerPane.add(datePane, "Center");

add(centerPane, "Center");

setSize(400, 300);

setVisible(true);

prevBtn.addActionListener(this);

nextBtn.addActionListener(this);

yearCombo.addActionListener(this);

monthCombo.addActionListener(this);

}

//Overring

public void actionPerformed(ActionEvent ae){

Object obj = ae.getSource();

if(obj instanceof JButton){

JButton eventBtn = (JButton)obj;

int yy = (Integer)yearCombo.getSelectedItem();

int mm = (Integer)monthCombo.getSelectedItem();

if(eventBtn.equals(prevBtn)){ //전달

if(mm==1){

yy--; mm=12;

}else{

mm--;

}

}else if(eventBtn.equals(nextBtn)){ //다음달

if(mm==12){

yy++; mm=1;

}else{

mm++;

}

}

yearCombo.setSelectedItem(yy);

monthCombo.setSelectedItem(mm);

}else if(obj instanceof JComboBox){ //콤보박스 이벤트 발생시

createDayStart();

}

}

public void createDayStart(){

datePane.setVisible(false); //패널 숨기기

datePane.removeAll(); //날짜 출력한 라벨 지우기

dayPrint((Integer)yearCombo.getSelectedItem(), (Integer)monthCombo.getSelectedItem());

datePane.setVisible(true); //패널 재출력

}

public void dayPrint(int y, int m){

Calendar cal = Calendar.getInstance();

cal.set(y, m-1, 1); //출력할 첫날의 객체 만든다.

int week = cal.get(Calendar.DAY_OF_WEEK); //1일에 대한 요일 일요일 : 0

int lastDate = cal.getActualMaximum(Calendar.DAY_OF_MONTH); //그 달의 마지막 날

for(int i=1; i<week; i++){ //날짜 출력 전까지의 공백 출력

datePane.add(new JLabel(" "));

}

for(int i=1; i<=lastDate; i++){

JLabel lbl = new JLabel(String.valueOf(i), JLabel.CENTER);

cal.set(y, m-1, i);

int outWeek = cal.get(Calendar.DAY_OF_WEEK);

if(outWeek==1){

lbl.setForeground(Color.red);

}else if(outWeek==7){

lbl.setForeground(Color.BLUE);

}

datePane.add(lbl);

}

}

public static void main(String[] args) {

new SwingCalendar();

}

}