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java编写日历代码教程
2023-06-15 16:38:41 深夜i     --     --
Java 日历程序 GUI组件

在Java编程中，编写一个日历程序是一个很有意义的项目。无论是在个人还是商业开发中，这种类型的应用程序都是很有用的。下面是一个简单的Java编写日历程序的教程，让你了解如何在Java中编写一个日历程序。

首先我们需要知道Java中的Date和Calendar类来获取日期和时间。然后可以使用Java GUI组件来显示日历。我们需要一个视窗、标签、按钮来构造整个应用。用户可以在界面上选择年和月，然后单击按钮来显示日历。这个日历应该可以清晰地显示每个月的所有日期，让用户可以方便地浏览。

下面是一个简单的Java代码示例，可以用于实现这个日历程序：



import java.awt.BorderLayout;


import java.awt.Color;


import java.awt.Container;


import java.awt.EventQueue;


import java.awt.Font;


import java.awt.event.ActionEvent;


import java.awt.event.ActionListener;


import java.text.DateFormatSymbols;


import java.util.Calendar;


import java.util.GregorianCalendar;


import javax.swing.JButton;


import javax.swing.JFrame;


import javax.swing.JLabel;


import javax.swing.JPanel;


import javax.swing.SwingConstants;


public class CalendarApp extends JFrame {


  private static final long serialVersionUID = 1L;


  private JLabel monthLabel;


  private JButton[] dayButtons;


  private Calendar cal = new GregorianCalendar();


  


  public CalendarApp() {


    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    setTitle("Java日历");


    setLocation(100, 50);


    setSize(700, 450);


    setResizable(false);


        


    JPanel mainPanel = new JPanel();


    mainPanel.setLayout(new BorderLayout(5, 5));


    mainPanel.setBackground(Color.gray);


    


    monthLabel = new JLabel("", SwingConstants.CENTER);


    monthLabel.setFont(new Font("SansSerif", Font.BOLD, 24));


    JPanel buttonPanel = new JPanel();


    buttonPanel.setLayout(new BorderLayout(5, 5));


    


    String[] dayNames = new DateFormatSymbols().getShortWeekdays();


    JPanel dayPanel = new JPanel();


    dayPanel.setBackground(Color.white);


    dayPanel.setLayout(new BorderLayout(0, 0));


    JPanel[] panels = new JPanel[7];


    for (int i = 0; i < 7; i++) {


      panels[i] = new JPanel();


      panels[i].setBackground(Color.white);


      dayPanel.add(panels[i], BorderLayout.CENTER);


      JLabel lab = new JLabel(dayNames[i + 1], SwingConstants.CENTER);


      panels[i].add(lab);


    }


    


    dayButtons = new JButton[42];


    JPanel[] dayPanel2 = new JPanel[6];


    for (int i = 0; i < 6; i++) {


      dayPanel2[i] = new JPanel();


      dayPanel2[i].setBackground(Color.white);


      dayPanel2[i].setLayout(new BorderLayout(0, 0));


      for (int j = 0; j < 7; j++) {


        JButton but = new JButton();


        but.setFont(new Font("Arial", Font.PLAIN, 10));


        but.addActionListener(new ActionListener() {


          public void actionPerformed(ActionEvent ae) {


            JButton but = (JButton) ae.getSource();


            String[] arr = but.getText().split(" ");


            cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(arr[1]));


            new DayFrame(cal).setVisible(true);


          }


        });


        


        dayButtons[(i * 7) + j] = but;


        JLabel lab = new JLabel();


        lab.setFont(new Font("Arial", Font.PLAIN, 10));


        JPanel pan = new JPanel(new BorderLayout());


        pan.setBackground(Color.white);


        pan.add(lab, BorderLayout.NORTH);


        pan.add(but, BorderLayout.CENTER);


        dayPanel2[i].add(pan, BorderLayout.CENTER);


      }


      buttonPanel.add(dayPanel2[i], BorderLayout.CENTER);


    }


    


    mainPanel.add(monthLabel, BorderLayout.PAGE_START);


    mainPanel.add(buttonPanel, BorderLayout.CENTER);


    mainPanel.add(dayPanel, BorderLayout.PAGE_END);


    


    Container con = getContentPane();


    con.add(mainPanel);


        


    setVisible(true);


  }


  


  private void refreshCalendar() {


    cal.set(Calendar.DAY_OF_MONTH, 1);


    String monthString = cal.getDisplayName(Calendar.MONTH, Calendar.LONG, null);


    monthLabel.setText(monthString + ", " + cal.get(Calendar.YEAR));


    


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


    int daysInMonth = cal.getActualMaximum(Calendar.DAY_OF_MONTH);


    


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


      dayButtons[i].setText("");


    }


    for (int i = 0; i < daysInMonth; i++) {


      int day = i + 1;


      dayButtons[(dayOfWeek - 1) + i].setText(day + "");


    }


  }


  


  private class DayFrame extends JFrame {


    private static final long serialVersionUID = 1L;


    private Calendar cal;


    public DayFrame(Calendar cal) {


      setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);


      setTitle("日");


      setLocation(200, 100);


      setSize(200, 150);


      setResizable(false);


      this.cal = cal; 


      JLabel lab = new JLabel(cal.get(Calendar.DAY_OF_MONTH) + "");


      lab.setFont(new Font("SansSerif", Font.BOLD, 30));


      add(lab);


      setVisible(true);


    }


  }


  


  class ButtonListener implements ActionListener {


    public void actionPerformed(ActionEvent e) {


      if(e.getActionCommand().equals("<")) {


        cal.add(Calendar.MONTH, -1);


      }


      else if(e.getActionCommand().equals(">")) {


        cal.add(Calendar.MONTH, 1);


      }


      refreshCalendar();


    }


  }


  


  public static void main(String[] args) {


    EventQueue.invokeLater(new Runnable() {


      public void run() {


        new CalendarApp().setVisible(true);


      }


    });


  }


}

这个日历程序主要使用了Java的GUI组件来实现，代码结构清晰明了，易于理解，可以为Java初学者提供很好的学习参考。

  
  

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