500行java代码的简单介绍

需要一个java程序，最好是万年历的，要在500行左右的

Java-时钟万年历

clock.java代码如下：

/**

* Clock.java

* Summary 数字时间显示

* Created on 2005-8-14

* @author 高?

* remark 如有改动请发一份代码给我，邮箱gkgklovelove@eyou.com

*/

package Clock;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.text.*;

import java.util.*;

class Clock extends Canvas implements Runnable{

MainFrame mf;

Thread t;

String time;

Clock(MainFrame mf){

this.mf=mf;

setSize(400,40);

setBackground(Color.white);

t=new Thread(this); //实例化线程

t.start(); //调用线程

}

public void run(){

while(true){

try{

t.sleep(1000); //休眠1秒钟

}catch(InterruptedException e){

System.out.println("异常");

}

this.repaint(100);

}

}

public void paint(Graphics g){

Font f=new Font("宋体",Font.BOLD,16);

SimpleDateFormat SDF=new SimpleDateFormat("yyyy'年'MM'月'dd'日'HH:mm:ss");//格式化时间显示类型

Calendar now=Calendar.getInstance();

time=SDF.format(now.getTime()); //得到当前日期和时间

g.setFont(f);

g.setColor(Color.orange);

g.drawString(time,100,25);

}

MainFrame．java 的代码如下：

/**

* MainFrame.java

* Summary 万年历主类

* Created on 2005-8-14

* @author 高?

* remark 如有改动请发一份代码给我，邮箱gkgklovelove@eyou.com

*/

package Clock;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.text.*;

import java.util.*;

class MainFrame extends JFrame{

JPanel panel=new JPanel(new BorderLayout());

JPanel panel1=new JPanel();

JPanel panel2=new JPanel(new GridLayout(7,7));

JPanel panel3=new JPanel();

JLabel []label=new JLabel[49];

JLabel y_label=new JLabel("年份");

JLabel m_label=new JLabel("月份");

JComboBox com1=new JComboBox();

JComboBox com2=new JComboBox();

JButton button=new JButton("查看");

int re_year,re_month;

int x_size,y_size;

String year_num;

Calendar now=Calendar.getInstance(); //实例化Calendar

MainFrame(){

super("万年历");

setSize(300,350);

x_size=(int)(Toolkit.getDefaultToolkit().getScreenSize().getWidth());

y_size=(int)(Toolkit.getDefaultToolkit().getScreenSize().getHeight());

setLocation((x_size-300)/2,(y_size-350)/2);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

panel1.add(y_label);

panel1.add(com1);

panel1.add(m_label);

panel1.add(com2);

panel1.add(button);

for(int i=0;i49;i++){

label[i]=new JLabel("",JLabel.CENTER);//将显示的字符设置为居中

panel2.add(label[i]);

}

panel3.add(new Clock(this));

panel.add(panel1,BorderLayout.NORTH);

panel.add(panel2,BorderLayout.CENTER);

panel.add(panel3,BorderLayout.SOUTH);

panel.setBackground(Color.white);

panel1.setBackground(Color.white);

panel2.setBackground(Color.white);

panel3.setBackground(Color.white);

Init();

button.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int c_year,c_month,c_week;

c_year=Integer.parseInt(com1.getSelectedItem().toString()); //得到当前所选年份

c_month=Integer.parseInt(com2.getSelectedItem().toString())-1; //得到当前月份，并减1,计算机中的月为0－11

c_week=use(c_year,c_month); //调用函数use，得到星期几

Resetday(c_week,c_year,c_month); //调用函数Resetday

}});

setContentPane(panel);

setVisible(true);

setResizable(false);

}

public void Init(){

int year,month_num,first_day_num;

String log[]={"日","一","二","三","四","五","六"};

for(int i=0;i7;i++){

label[i].setText(log[i]);

}

for(int i=0;i49;i=i+7){

label[i].setForeground(Color.red); //将星期日的日期设置为红色

}

for(int i=6;i49;i=i+7){

label[i].setForeground(Color.green);//将星期六的日期设置为绿色

}

for(int i=1;i10000;i++){

com1.addItem(""+i);

}

for(int i=1;i13;i++){

com2.addItem(""+i);

}

month_num=(int)(now.get(Calendar.MONTH)); //得到当前时间的月份

year=(int)(now.get(Calendar.YEAR)); //得到当前时间的年份

com1.setSelectedIndex(year-1); //设置下拉列表显示为当前年

com2.setSelectedIndex(month_num); //设置下拉列表显示为当前月

first_day_num=use(year,month_num);

Resetday(first_day_num,year,month_num);

}

public int use(int reyear,int remonth){

int week_num;

now.set(reyear,remonth,1); //设置时间为所要查询的年月的第一天

week_num= (int)(now.get(Calendar.DAY_OF_WEEK));//得到第一天的星期

return week_num;

}

public void Resetday(int week_log,int year_log,int month_log){

int month_score_log; //判断是否是闰年的标记

int month_day_score; //存储月份的天数

int count;

month_score_log=0;

month_day_score=0;

count=1;

if(year_log%4==0year_log%100!=0||year_log%400==0){//判断是否为闰年

month_score_log=1;

}

month_log=month_log+1; //将传来的月份数加1

switch(month_log){

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

month_day_score=31;

break;

case 4:

case 6:

case 9:

case 11:

month_day_score=30;

break;

case 2:

if(month_score_log==1){

month_day_score=29;

}

else{

month_day_score=28;

}

break;

}

for(int i=7;i49;i++){ //初始化标签

label[i].setText("");

}

week_log=week_log+6; //将星期数加6，使显示正确

month_day_score=month_day_score+week_log;

for(int i=week_log;imonth_day_score;i++,count++){

label[i].setText(count+"");

}

}

public static void main(String [] args){

JFrame.setDefaultLookAndFeelDecorated(true);

MainFrame start=new MainFrame();

}

}

相关问答

Q1: 一个java管理系统多少行代码

1，java规范中一般不建议一个java类中超过500行

2，一行的长度不超过200个

3，按照规定格式将代码格式化

Q2: 需要一份500行的java程序，期末大作业，最好带详细注释。

Java生成CSV文件简单操作实例

CSV是逗号分隔文件(Comma Separated Values)的首字母英文缩写，是一种用来存储数据的纯文本格式，通常用于电子表格或数据库软件。在 CSV文件中，数据“栏”以逗号分隔，可允许程序通过读取文件为数据重新创建正确的栏结构，并在每次遇到逗号时开始新的一栏。如：

123   1,张三,男2,李四,男3,小红,女   

Java生成CSV文件（创建与导出封装类）

package com.yph.omp.common.util;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.LinkedHashMap;

import java.util.List;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

import org.junit.Test;

/**

* Java生成CSV文件

*/

public class CSVUtil {

/**

* 生成为CVS文件

*

* @param exportData

*            源数据List

* @param map

*            csv文件的列表头map

* @param outPutPath

*            文件路径

* @param fileName

*            文件名称

* @return

*/

@SuppressWarnings("rawtypes")

public static File createCSVFile(List exportData, LinkedHashMap map,

String outPutPath, String fileName) {

File csvFile = null;

BufferedWriter csvFileOutputStream = null;

try {

File file = new File(outPutPath);

if (!file.exists()) {

file.mkdir();

}

// 定义文件名格式并创建

csvFile = File.createTempFile(fileName, ".csv",

new File(outPutPath));

// UTF-8使正确读取分隔符","

csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(

new FileOutputStream(csvFile), "GBK"), 1024);

// 写入文件头部

for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator

.hasNext();) {

java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator

.next();

csvFileOutputStream

.write("\"" + (String) propertyEntry.getValue() != null ? (String) propertyEntry

.getValue() : "" + "\"");

if (propertyIterator.hasNext()) {

csvFileOutputStream.write(",");

}

}

csvFileOutputStream.newLine();

// 写入文件内容

for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {

Object row = (Object) iterator.next();

for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator

.hasNext();) {

java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator

.next();

/*-------------------------------*/　

//以下部分根据不同业务做出相应的更改

StringBuilder sbContext = new StringBuilder("");

if (null != BeanUtils.getProperty(row,(String) propertyEntry.getKey())) {

if("证件号码".equals(propertyEntry.getValue())){

//避免：身份证号码 ，读取时变换为科学记数 - 解决办法：加 \t(用Excel打开时，证件号码超过15位后会自动默认科学记数)

sbContext.append(BeanUtils.getProperty(row,(String) propertyEntry.getKey()) + "\t");

}else{

sbContext.append(BeanUtils.getProperty(row,(String) propertyEntry.getKey()));                         

}

}

csvFileOutputStream.write(sbContext.toString());

/*-------------------------------*/                 

if (propertyIterator.hasNext()) {

csvFileOutputStream.write(",");

}

}

if (iterator.hasNext()) {

csvFileOutputStream.newLine();

}

}

csvFileOutputStream.flush();

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

csvFileOutputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return csvFile;

}

/**

* 下载文件

*

* @param response

* @param csvFilePath

*            文件路径

* @param fileName

*            文件名称

* @throws IOException

*/

public static void exportFile(HttpServletRequest request,

HttpServletResponse response, String csvFilePath, String fileName)

throws IOException {

response.setCharacterEncoding("UTF-8");

response.setContentType("application/csv;charset=GBK");

response.setHeader("Content-Disposition", "attachment; filename="

+ new String(fileName.getBytes("GB2312"), "ISO8859-1"));

InputStream in = null;

try {

in = new FileInputStream(csvFilePath);

int len = 0;

byte[] buffer = new byte[1024];

OutputStream out = response.getOutputStream();

while ((len = in.read(buffer)) 0) {

out.write(buffer, 0, len);

}

} catch (FileNotFoundException e1) {

System.out.println(e1);

} finally {

if (in != null) {

try {

in.close();

} catch (Exception e1) {

throw new RuntimeException(e1);

}

}

}

}

/**

* 删除该目录filePath下的所有文件

*

* @param filePath

*            文件目录路径

*/

public static void deleteFiles(String filePath) {

File file = new File(filePath);

if (file.exists()) {

File[] files = file.listFiles();

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

if (files[i].isFile()) {

files[i].delete();

}

}

}

}

/**

* 删除单个文件

*

* @param filePath

*            文件目录路径

* @param fileName

*            文件名称

*/

public static void deleteFile(String filePath, String fileName) {

File file = new File(filePath);

if (file.exists()) {

File[] files = file.listFiles();

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

if (files[i].isFile()) {

if (files[i].getName().equals(fileName)) {

files[i].delete();

return;

}

}

}

}

}

@SuppressWarnings({ "unchecked", "rawtypes" })

@Test

public void createFileTest() {

List exportData = new ArrayListMap();

Map row1 = new LinkedHashMapString, String();

row1.put("1", "11");

row1.put("2", "12");

row1.put("3", "13");

row1.put("4", "14");

exportData.add(row1);

row1 = new LinkedHashMapString, String();

row1.put("1", "21");

row1.put("2", "22");

row1.put("3", "23");

row1.put("4", "24");

exportData.add(row1);

LinkedHashMap map = new LinkedHashMap();

map.put("1", "第一列");

map.put("2", "第二列");

map.put("3", "第三列");

map.put("4", "第四列");

String path = "d:/export";

String fileName = "文件导出";

File file = CSVUtil.createCSVFile(exportData, map, path, fileName);

String fileNameNew = file.getName();

String pathNew = file.getPath();

System.out.println("文件名称：" + fileNameNew );

System.out.println("文件路径：" + pathNew );

}

}

//注：BeanUtils.getProperty(row,(String) propertyEntry.getKey()) + "\t" ，只为解决数字格式超过15位后，在Excel中打开展示科学记数问题。

Q3: 求java小程序代码，500行左右。。大作业用。追加50

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class mypanel extends Panel implements MouseListener

{

int chess[][] = new int[11][11];

boolean Is_Black_True;

mypanel()

{

Is_Black_True = true;

for(int i = 0;i 11;i++)

{

for(int j = 0;j 11;j++)

{

chess[i][j] = 0;

}

}

addMouseListener(this);

setBackground(Color.BLUE);

setBounds(0, 0, 360, 360);

setVisible(true);

}

public void mousePressed(MouseEvent e)

{

int x = e.getX();

int y = e.getY();

if(x 25 || x 330 + 25 ||y 25 || y 330+25)

{

return;

}

if(chess[x/30-1][y/30-1] != 0)

{

return;

}

if(Is_Black_True == true)

{

chess[x/30-1][y/30-1] = 1;

Is_Black_True = false;

repaint();

Justisewiner();

return;

}

if(Is_Black_True == false)

{

chess[x/30-1][y/30-1] = 2;

Is_Black_True = true;

repaint();

Justisewiner();

return;

}

}

void Drawline(Graphics g)

{

for(int i = 30;i = 330;i += 30)

{

for(int j = 30;j = 330; j+= 30)

{

g.setColor(Color.WHITE);

g.drawLine(i, j, i, 330);

}

}

for(int j = 30;j = 330;j += 30)

{

g.setColor(Color.WHITE);

g.drawLine(30, j, 330, j);

}

}

void Drawchess(Graphics g)

{

for(int i = 0;i 11;i++)

{

for(int j = 0;j 11;j++)

{

if(chess[i][j] == 1)

{

g.setColor(Color.BLACK);

g.fillOval((i + 1) * 30 - 8, (j + 1) * 30 - 8, 16, 16);

}

if(chess[i][j] == 2)

{

g.setColor(Color.WHITE);

g.fillOval((i + 1) * 30 - 8, (j + 1) * 30 - 8, 16, 16);

}

}

}

}

void Justisewiner()

{

int black_count = 0;

int white_count = 0;

int i = 0;

for(i = 0;i 11;i++)//横向判断

{

for(int j = 0;j 11;j++)

{

if(chess[i][j] == 1)

{

black_count++;

if(black_count == 5)

{

JOptionPane.showMessageDialog(this, "黑棋胜利");

Clear_Chess();

return;

}

}

else

{

black_count = 0;

}

if(chess[i][j] == 2)

{

white_count++;

if(white_count == 5)

{

JOptionPane.showMessageDialog(this, "白棋胜利");

Clear_Chess();

return;

}

}

else

{

white_count = 0;

}

}

}

for(i = 0;i 11;i++)//竖向判断

{

for(int j = 0;j 11;j++)

{

if(chess[j][i] == 1)

{

black_count++;

if(black_count == 5)

{

JOptionPane.showMessageDialog(this, "黑棋胜利");

Clear_Chess();

return;

}

}

else

{

black_count = 0;

}

if(chess[j][i] == 2)

{

white_count++;

if(white_count == 5)

{

JOptionPane.showMessageDialog(this, "白棋胜利");

Clear_Chess();

return;

}

}

else

{

white_count = 0;

}

}

}

for(i = 0;i 7;i++)//左向右斜判断

{

for(int j = 0;j 7;j++)

{

for(int k = 0;k 5;k++)

{

if(chess[i + k][j + k] == 1)

{

black_count++;

if(black_count == 5)

{

JOptionPane.showMessageDialog(this, "黑棋胜利");

Clear_Chess();

return;

}

}

else

{

black_count = 0;

}

if(chess[i + k][j + k] == 2)

{

white_count++;

if(white_count == 5)

{

JOptionPane.showMessageDialog(this, "白棋胜利");

Clear_Chess();

return;

}

}

else

{

white_count = 0;

}

}

}

}

for(i = 4;i 11;i++)//右向左斜判断

{

for(int j = 6;j = 0;j--)

{

for(int k = 0;k 5;k++)

{

if(chess[i - k][j + k] == 1)

{

black_count++;

if(black_count == 5)

{

JOptionPane.showMessageDialog(this, "黑棋胜利");

Clear_Chess();

return;

}

}

else

{

black_count = 0;

}

if(chess[i - k][j + k] == 2)

{

white_count++;

if(white_count == 5)

{

JOptionPane.showMessageDialog(this, "白棋胜利");

Clear_Chess();

return;

}

}

else

{

white_count = 0;

}

}

}

}

}

void Clear_Chess()

{

for(int i=0;i11;i++)

{

for(int j=0;j11;j++)

{

chess[i][j]=0;

}

}

repaint();

}

public void paint(Graphics g)

{

Drawline(g);

Drawchess(g);

}

public void mouseExited(MouseEvent e){}

public void mouseEntered(MouseEvent e){}

public void mouseReleased(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

}

class myframe extends Frame implements WindowListener

{

mypanel panel;

myframe()

{

setLayout(null);

panel = new mypanel();

add(panel);

panel.setBounds(0,23, 360, 360);

setTitle("单人版五子棋");

setBounds(200, 200, 360, 383);

setVisible(true);

addWindowListener(this);

}

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

public void windowDeactivated(WindowEvent e){}

public void windowActivated(WindowEvent e){}

public void windowOpened(WindowEvent e){}

public void windowClosed(WindowEvent e){}

public void windowIconified(WindowEvent e){}

public void windowDeiconified(WindowEvent e){}

}

public class mywindow

{

public static void main(String argc [])

{

myframe f = new myframe();

}

}

Q4: 一个java文件里面最多写多少行代码？

hotspot 虚拟机（咱们平时开发用的sun公司的虚拟机，其他两大商用虚拟机是BEA的JRockit和IBM的J9）里面两个字节来限制大小，所以最多65536行，超过javac会无法编译。而且一个Java方法不能超过64k。一般一个Java类不要有太多行数，如果一个Java代码超过几千甚至过万，个人觉得应该考虑一些代码优化方式，比如继承；或者重新构思这个类。代码行数太多可读性查，不利于维护。

500行java代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于、500行java代码的信息别忘了在本站进行查找喔。