java GUI简单日历查看

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;

public class swingCalendar extends JFrame implements ActionListener {
    public static swingCalendar u1;
    private JTextField jTextField;
    private JTextArea jTextArea;
    private JButton[] jButton;
    private JMenuItem[] jMenuItems;
    private JMenu[] jMenus;
    private JMenuBar mbar;
    private JComboBox comboBox;
    private JLabel jLabel;
    public swingCalendar(){
        super("日历");
        jButton = new JButton[1];
        jMenus = new JMenu[3];
        jButton = new JButton[1];
        comboBox = new JComboBox<String>();
        jLabel = new JLabel();
        jTextField = new JTextField();
        jTextArea = new JTextArea();
        jMenuItems = new JMenuItem[4];

        jMenuItems[0] = new JMenuItem("关于我");
        jMenuItems[1] = new JMenuItem("帮助文档");
        jMenuItems[2] = new JMenuItem("退出");
        jMenuItems[3] = new JMenuItem("清零");
        jMenuItems[0].addActionListener(this);
        jMenuItems[1].addActionListener(this);
        jMenuItems[2].addActionListener(this);
        jMenuItems[3].addActionListener(this);


        jMenus[0] = new JMenu("查看(V)");
        jMenus[1] = new JMenu("编辑(E)");
        jMenus[2] = new JMenu("帮助(H)");
        for (int i = 0 ; i < jMenus.length;i++){
            jMenus[i].addActionListener(this);
        }
        jMenus[2].add(jMenuItems[0]);
        jMenus[2].add(jMenuItems[1]);
        jMenus[2].add(jMenuItems[2]);
        jMenus[1].add(jMenuItems[3]);

        comboBox.addItem("一月");
        comboBox.addItem("二月");
        comboBox.addItem("三月");
        comboBox.addItem("四月");
        comboBox.addItem("五月");
        comboBox.addItem("六月");
        comboBox.addItem("七月");
        comboBox.addItem("八月");
        comboBox.addItem("九月");
        comboBox.addItem("十月");
        comboBox.addItem("十一月");
        comboBox.addItem("十二月");
        comboBox.addActionListener(this);
        comboBox.setBounds(100,20,70,30);

        jButton[0] = new JButton("确定");
        jButton[0].setBounds(350,20,70,30);
        jButton[0].setForeground(Color.blue);
        jButton[0].setFont(new Font("宋体",Font.PLAIN,14));
        jButton[0].addActionListener(this);

        jTextField= new JTextField("",40);
        jTextField.setFont(new Font("宋体",Font.PLAIN,11));
        jTextField.setForeground(Color.black);
        jTextField.setBounds(10,20,50,30);
        jTextField.setHorizontalAlignment(JTextField.RIGHT);
        jTextField.addActionListener(this);
        jTextField.setEditable(true);

        mbar = new JMenuBar();
        mbar.add(jMenus[0]);
        mbar.add(jMenus[1]);
        mbar.add(jMenus[2]);
        this.setJMenuBar(mbar);

        jTextArea = new JTextArea();
        jTextArea.setFont(new Font("宋体",Font.BOLD,14));
        jTextArea.setForeground(Color.black);
        jTextArea.setBounds(50,110,400,300);
        jTextArea.setEditable(false);


        jLabel.setBounds(230,20,50,30);
        jLabel.setText("");
        jLabel.setForeground(Color.red);


        Container winContainer = this.getContentPane();
        winContainer.setLayout(null);
        winContainer.add(jTextField);
        winContainer.add(jTextArea);
        winContainer.add(jButton[0]);
        winContainer.add(comboBox);
        winContainer.add(jTextArea);
        winContainer.add(jLabel);
        this.setTitle("日历");
        this.setLocation(300, 300);
        this.setSize(500,500);
        this.setVisible(true);

    }

    public static void main(String[] args) {
        u1 = new swingCalendar();
    }
    public void actionPerformed(ActionEvent e){
        if(e.getSource()==jButton[0]) {
            jLabel.setText("");
            jTextArea.setText("");
            String aa = jTextField.getText();
            if (aa.charAt(0)<‘0‘||aa.charAt(0)>‘9‘){
                JOptionPane.showMessageDialog(u1, "无法读取你的输入,请重新输入", "提示消息", 1);
                comboBox.setSelectedIndex(0);
                jTextField.setText("");
            }
            else{
                int year = Integer.valueOf(aa);
                if (year <= 250) {
                    JOptionPane.showMessageDialog(u1, "对不起,本日历无法查询到"+year+"年的日历\n\t请点击菜单栏-帮助-联系工程师", "提示消息", 1);
                    comboBox.setSelectedIndex(0);
                    jTextField.setText("");
                }
                else {
                    jLabel.setText(aa);


                    String[] English = {"一", "二", "三", "四", "五", "六", "日"};
                    String[] Month = {"一月", "二月", "三月", "四月", "五月", "六月", "七月", "八月", "九月", "十月", "十一月", "十二月",};
                    Calendar calendar = Calendar.getInstance();
                    StringBuffer stringBuffer = new StringBuffer("");
                    for (int j = 0; j < English.length; j++) {
                        stringBuffer.append(English[j] + "\t");
                    }
                    stringBuffer.append("\n");
                    int index = comboBox.getSelectedIndex();
                    calendar.clear();
                    calendar.set(Calendar.YEAR, year);

                    switch (index) {
                        case 0: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 1: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }

                            break;
                        }
                        case 2: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 3: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 4: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 5: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 6: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 7: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 8: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 9: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 10: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }
                        case 11: {
                            calendar.set(Calendar.MONTH, index);
                            int Month_Days = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
                            int First_Day = calendar.get(Calendar.DAY_OF_WEEK) - 1;
                            int n = 0;
                            if (First_Day > 0) {
                                for (int k = 2; k <= First_Day; k++) {
                                    n = First_Day - 1;
                                    stringBuffer.append("\t");
                                }
                            }
                            if (First_Day == 0) {
                                n = 6;
                                for (int k = 1; k < 7; k++) {
                                    stringBuffer.append("\t");
                                }
                            }
                            for (int k = 1; k <= Month_Days; k++) {
                                stringBuffer.append(k + "\t");
                                n++;
                                if (n % 7 == 0) {
                                    stringBuffer.append("\n");
                                }

                            }
                            break;
                        }


                    }

                    jTextArea.setText(String.valueOf(stringBuffer));


                }
            }

        }
        else if (e.getSource()==jMenuItems[0]){
            JOptionPane.showMessageDialog(u1,"开发者洪家骏","开发者信息",1);

        }
        else if (e.getSource()==jMenuItems[1]){
            JOptionPane.showMessageDialog(u1,"暂时没有开发文档","帮助文档",1);
        }
        else if (e.getSource()==jMenuItems[2]){
            int aa = JOptionPane.showConfirmDialog(u1,"您确定要退出吗！","退出",1);
            if(aa==0) {
                System.exit(0);
            }

        }
        else if(e.getSource()==jMenuItems[3]){
            jLabel.setText("");
            jTextArea.setText("");
            jTextField.setText("");
            comboBox.setSelectedIndex(0);
            JOptionPane.showMessageDialog(u1,"清空成功","清空",1);
        }

        }




    }