這篇文章主要介紹了日歷顯示讀出輸入的年月的java代碼，有需要的朋友可以參考一下
代碼如下: import java.awt.*; import java.awt.event.*; import java.util.Calendar; import javax.swing.JOptionPane; class CalendarBean { //定義一個日歷類 String day[]; //天數數組 int year = 2011, month = 9; //給定一個初始年月 public void setYear(int year) { this.year = year; } public int getYear() { return year; } public void setMonth(int month) { this.month = month; } public int getMonth() { return month; } public String[] getCalendar() { //獲得日歷 String a[] = new String[42]; //定義一個以字符串數組 Calendar 日歷 = Calendar.getInstance(); 日歷.set(year, month - 1, 1); int 星期幾 = 日歷.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 = 星期幾, n = 1; i < 星期幾 + day; i++) { a[i] = String.valueOf(n); n++; } return a; } } class CalendarFrame extends Frame implements ActionListener { Label labelDay[] = new Label[42]; //用來輸出日歷的天的數組 Button titleName[] = new Button[7]; //周一到周天的按鍵 String name[] = { "日", "一", "二", "三", "四", "五", "六" }; TextField text1, text2; //定義輸入的年份和月份 Button nextMonth, previousMonth, Enter; //下個月，上個月，確定 Label lab1, lab2, lab3; //幾個文本類型的字符串 int year = 2012, month = 9; CalendarBean calendar; //頂一個量 Label showMessage = new Label("", Label.CENTER); // 定義一個用於顯示 當前年月的label 表明，標簽上應為中心。 public CalendarFrame() { //窗體類 Panel pCenter = new Panel(); //鑲嵌 pCenter.setLayout(new GridLayout(7, 7)); for (int i = 0; i < 7; i++) { //給周日到周六的button添加顯示文本 titleName[i] = new Button(name[i]); pCenter.add(titleName[i]); } for (int i = 0; i < 42; i++) { labelDay[i] = new Label("", Label.CENTER); pCenter.add(labelDay[i]); } calendar = new CalendarBean(); calendar.setYear(year); //設定年 calendar.setMonth(month); String day[] = calendar.getCalendar(); //設定天 for (int i = 0; i < 42; i++) { //給日歷位置循環添加顯示日歷天 labelDay[i].setText(day[i]); } lab1 = new Label("請輸入日期"); //調用一個方法 new一個對象 lab2 = new Label("年份"); lab3 = new Label("月份"); Enter = new Button("確定"); text1 = new TextField(10); text2 = new TextField(5); nextMonth = new Button("下月"); previousMonth = new Button("上月"); Enter.addActionListener(this); //添加指定的動作偵聽器 nextMonth.addActionListener(this); previousMonth.addActionListener(this); Panel pNorth = new Panel(), pSouth = new Panel(); pNorth.add(lab1); pNorth.add(lab2); pNorth.add(text1); pNorth.add(lab3); pNorth.add(text2); pNorth.add(Enter); pNorth.add(previousMonth); pNorth.add(nextMonth); pSouth.add(showMessage); showMessage.setText("日歷：" + calendar.getYear() + "年" + calendar.getMonth() + "月"); ScrollPane scrollPane = new ScrollPane(); //實現單個子組件的自動水平和/或垂直滾動的容器類 scrollPane.add(pCenter); add(scrollPane, BorderLayout.CENTER); add(pNorth, BorderLayout.NORTH); add(pSouth, BorderLayout.SOUTH); } public void actionPerformed(ActionEvent e) { if (e.getSource() == nextMonth) { //如果獲得的操作時下個月的 month = month + 1; if (month > 12) month = 1; calendar.setMonth(month); String day[] = calendar.getCalendar(); for (int i = 0; i < 42; i++) { labelDay[i].setText(day[i]); } } else if (e.getSource() == previousMonth) { month = month - 1; if (month < 1) month = 12; calendar.setMonth(month); String day[] = calendar.getCalendar(); for (int i = 0; i < 42; i++) { labelDay[i].setText(day[i]); } } else { String yea = text1.getText(); String mon = text2.getText(); try { year = Integer.parseInt(yea); //把string轉成int類型 month = Integer.parseInt(mon); if (month > 12 || month < 1 || year < 1) { //錯誤輸入的處理 JOptionPane.showMessageDialog(null, "請輸入正確月份或月份"); return; } else { calendar.setYear(year); calendar.setMonth(month); } String day[] = calendar.getCalendar(); for (int i = 0; i < 42; i++) { labelDay[i].setText(day[i]); } } catch (NumberFormatException ee) { JOptionPane.showMessageDialog(null, "請輸入正確的年份及月份"); } } showMessage.setText("日歷：" + calendar.getYear() + "年" + calendar.getMonth() + "月"); } } public class CalendarMainClass { public static void main(String args[]) { CalendarFrame frame = new CalendarFrame(); frame.setTitle("日歷"); frame.setBounds(300, 200, 500, 300); frame.setVisible(true); //顯示窗口 frame.validate(); //使生效 frame.addWindowListener(new java.awt.event.WindowAdapter() { //點擊叉號關閉frame程序 public void windowClosing(java.awt.event.WindowEvent e) { System.exit(0); } }); } }