java300行代码的简单介绍

求java代码300行左右，要有注释，能运行，基础点的越基础的越好，300行以上就好，不要太长的

300行能干啥啊，你还不如自己做做练习题。

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package suoha;

import java.util.ArrayList;import java.util.Random;

public class MainFunction {

private ArrayListMyCard cards = new ArrayListMyCard();

private int[] cardNumArr = new int[52];

private int[] mycards = new int[5];

private int[] p1cards = new int[5];

public static void main(String[] args) {

MainFunction mainfunc = new MainFunction();

mainfunc.makeCards();

mainfunc.cardNumArr = mainfunc.shuffleCards(mainfunc.cardNumArr);

mainfunc.catchCards();

mainfunc.showAllCardsOfHand();

//mainfunc.printNums();

}

/**

* 洗牌

* @param cardNums

* @return

*/

private int[] shuffleCards(int[] cardNums){

int size = cardNums.length;

int[] returnNums = new int[size];

//System.out.println(cardNums[0]+"=========================");

Random rand = new Random();

for(int i=size-1;i0;i--){

int nextInt = rand.nextInt(i);

returnNums[size-1-i] = cardNums[nextInt];

cardNums[nextInt] = cardNums[i];

cardNums[i] = returnNums[size-1-i];

//System.out.println("suijishu:"+nextInt+"||zhi:"+returnNums[size-1-i]);

}

returnNums[size-1] = cardNums[0];

return returnNums;

}

/**

* 抓牌

*/

private void catchCards(){

for(int i=0;i5;i++){

mycards[i] = cardNumArr[2*i];

p1cards[i] = cardNumArr[2*i+1];

}

}

private void showAllCardsOfHand(){

System.out.print("你手中的牌是：||");

for(int i=0;i5;i++){

MyCard myCard = cards.get(mycards[i]-1);

System.out.print(myCard.toString()+"||");

}

System.out.println();

System.out.print("对家手中的牌是：||");

for(int i=0;i5;i++){

MyCard myCard = cards.get(p1cards[i]-1);

System.out.print(myCard.toString()+"||");

}

}

/**

* 显示牌的顺序

*/

private void printNums(){

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

System.out.print(cardNumArr[i]+",");

}

}

/**

* 制作卡片

*/

private void makeCards(){

for(int i=1;i=13;i++){

for(int j=1;j=4;j++){

//System.out.println((i-1)*4+j);

MyCard card = new MyCard((i-1)*4+j, j, i);

cardNumArr[(i-1)*4+j-1] = (i-1)*4+j;

cards.add(card);

}

// MyCard card1 = new MyCard((i-1)*4+1, 1, i);

// MyCard card2 = new MyCard((i-1)*4+2, 2, i);

// MyCard card3 = new MyCard((i-1)*4+3, 3, i);

// MyCard card4 = new MyCard((i-1)*4+4, 4, i);

// cards.add(card1);

// cards.add(card2);

// cards.add(card3);

// cards.add(card4);

}

}

}

我是一名学软件的学生,有那位高手知道如何编写有300行代码的JAVA程序?

差不多300行了！

/* 本程序使用常见组件设计一个用于输入学生信息的用户界面 */

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

import java.io.*;

public class Example0701_Components extends JFrame implements ActionListener

{

JTextField name;

JPasswordField password;

JRadioButton male;

JRadioButton female;

JCheckBox party;

JSpinner age;

JButton selectColor;

JPanel color;

JSlider addition;

JComboBox department;

JList course;

JButton confirm;

JButton save;

JTextArea result;

JProgressBar progbar;

JLabel time;

public Example0701_Components()

{

setTitle("Components usage in inputting the information of students");

setDefaultCloseOperation(EXIT_ON_CLOSE);

buildContentPane();

setExtendedState(MAXIMIZED_BOTH);

setVisible(true);

}

public void buildContentPane()

{

name = new JTextField();

password = new JPasswordField();

male = new JRadioButton("男", true);

female = new JRadioButton("女");

ButtonGroup group = new ButtonGroup();

group.add(male);

group.add(female);

party = new JCheckBox("", false);

age = new JSpinner();

age.setValue(new Integer(20));

age.addChangeListener(new ChangeListener()

{

public void stateChanged(ChangeEvent evt)

{

Integer v = (Integer)age.getValue();

int value = v.intValue();

if (value = 15)

{

age.setValue(new Integer(15));

}

if (value = 25)

{

age.setValue(new Integer(25));

}

}

});

color = new JPanel();

color.setBorder(BorderFactory.createLineBorder(Color.BLUE));

addition = new JSlider(JSlider.HORIZONTAL, 0, 100, 50);

addition.setMajorTickSpacing(10);

addition.setMinorTickSpacing(5);

addition.setPaintTicks(true);

addition.setPaintLabels(true);

addition.setSnapToTicks(true);

String[] departmentNames = {

"计算机科学与技术系",

"电子信息与技术系",

"计算机工程系"

};

department = new JComboBox(departmentNames);

department.setEditable(false);

String[] coursesNames = {

"数据结构",

"操作系统",

"网络原理",

"Java程序设计",

"分布式系统开发技术",

"计算机导论",

"密码学",

"计算机组成原理",

"编译原理",

"图形学"

};

course = new JList(coursesNames);

course.setVisibleRowCount(5);

confirm = new JButton("确认");

confirm.addActionListener(this);

save = new JButton("保存");

save.addActionListener(this);

result = new JTextArea();

time = new JLabel("计时开始...");

progbar = new JProgressBar(JProgressBar.HORIZONTAL,0,100);

progbar.setStringPainted(true);

Timer timer = new Timer(1000, new ActionListener()

{

public void actionPerformed(ActionEvent evt)

{

java.text.SimpleDateFormat sf = new java.text.SimpleDateFormat("yyyy 年 M 月 d 日 hh : mm : ss");

time.setText(sf.format(new java.util.Date()));

if (progbar.getValue() = 100) progbar.setValue(0);

progbar.setValue(progbar.getValue() + 5);

}

});

timer.start();

Box boxName = Box.createHorizontalBox();

boxName.add(new JLabel("姓名"));

boxName.add(name);

Box boxPassword = Box.createHorizontalBox();

boxPassword.add(new JLabel("密码"));

boxPassword.add(password);

Box boxSexPartyAgeColor = Box.createHorizontalBox();

boxSexPartyAgeColor.add(new JLabel("性别"));

boxSexPartyAgeColor.add(male);

boxSexPartyAgeColor.add(female);

boxSexPartyAgeColor.add(Box.createHorizontalGlue());

boxSexPartyAgeColor.add(new JLabel("党否"));

boxSexPartyAgeColor.add(party);

boxSexPartyAgeColor.add(Box.createHorizontalGlue());

boxSexPartyAgeColor.add(new JLabel("年龄"));

boxSexPartyAgeColor.add(age);

boxSexPartyAgeColor.add(Box.createHorizontalGlue());

selectColor = new JButton("选择颜色");

selectColor.addActionListener(this);

boxSexPartyAgeColor.add(selectColor);

boxSexPartyAgeColor.add(Box.createHorizontalStrut(10));

boxSexPartyAgeColor.add(color);

Box boxAge = Box.createHorizontalBox();

Box boxAddition = Box.createHorizontalBox();

boxAddition.add(new JLabel("加分"));

boxAddition.add(addition);

Box box1 = Box.createVerticalBox();

box1.add(Box.createVerticalStrut(20));

box1.add(boxName);

box1.add(Box.createVerticalStrut(20));

box1.add(boxPassword);

box1.add(Box.createVerticalStrut(20));

box1.add(boxSexPartyAgeColor);

box1.add(Box.createVerticalStrut(20));

box1.add(boxAddition);

box1.add(Box.createVerticalStrut(20));

Box butt = Box.createHorizontalBox();

butt.add(confirm);

butt.add(Box.createHorizontalStrut(10));

butt.add(save);

Box box2 = Box.createVerticalBox();

box2.add(new JLabel("系别"));

box2.add(department);

box2.add(Box.createVerticalStrut(10));

box2.add(new JLabel("选课"));

box2.add(new JScrollPane(course));

box2.add(Box.createVerticalStrut(10));

box2.add(butt);

Box box = Box.createHorizontalBox();

box.setBorder(BorderFactory.createTitledBorder("请输入学生信息"));

box.add(box1);

box.add(Box.createHorizontalStrut(20));

box.add(new JSeparator(JSeparator.VERTICAL));

box.add(Box.createHorizontalStrut(20));

box.add(box2);

JSplitPane split = new JSplitPane(JSplitPane.VERTICAL_SPLIT, true, box, new JScrollPane(result));

JPanel panel = new JPanel();

panel.setLayout(new GridLayout(1,3));

panel.add(new JLabel("作者：QSP 2005 年 10 月"));

panel.add(time);

panel.add(progbar);

JLabel title = new JLabel("学生信息录入系统", new ImageIcon("mouse.gif"), JLabel.CENTER);

title.setHorizontalTextPosition(JLabel.LEFT);

title.setForeground(Color.BLUE);

title.setFont(new Font("黑体", Font.BOLD, 36));

Container con = getContentPane();

con.add(title, "North");

con.add(split, "Center");

con.add(panel, "South");

}

public void actionPerformed(ActionEvent evt)

{

if (evt.getSource() == selectColor)

{

Color c = JColorChooser.showDialog(this, "请选择你所喜欢的颜色", color.getBackground());

color.setBackground(c);

}

if (evt.getSource() == confirm)

{

String nameStr = name.getText();

if (nameStr.equals(""))

{

JOptionPane.showMessageDialog(this, "姓名不能为空！");

name.requestFocus();

return;

}

int ret = JOptionPane.showConfirmDialog(this, "确认信息是正确的吗？");

if (ret != JOptionPane.YES_OPTION) return;

StringBuffer courses = new StringBuffer();

Object[] selectedCourses = course.getSelectedValues();

for (int i = 0 ; i selectedCourses.length ; i++)

{

courses.append((String)selectedCourses[i]);

if (i selectedCourses.length - 1)

{

courses.append("，");

}

}

String student =

nameStr + "，" +

"密码(" + new String(password.getPassword()) + ")，" +

(male.isSelected() ? "男，" : "女，") +

(party.isSelected() ? "党员，" : "") +

"现年" + age.getValue() + "岁，" +

"喜欢" + color.getBackground() + "颜色，" +

"可得到加分" + addition.getValue() + "，" +

"在" + department.getSelectedItem() + "学习，" ;

+"选修的课程有：" + courses + "\n";

result.append(student);

}

if (evt.getSource() == save)

{

JFileChooser fc = new JFileChooser();

if (JFileChooser.APPROVE_OPTION == fc.showSaveDialog(this))

{

try

{

File f = fc.getSelectedFile();

FileWriter fw = new FileWriter(f);

fw.write(result.getText());

fw.close();

}

catch (IOException e)

{

JOptionPane.showMessageDialog(this, "文件 IO 异常！");

}

}

}

}

public static void main(String[] args)

{

new Example0701_Components();

}

}

java 项目 代码行数多少 算大项目

java项目的大小衡量标准：

微型：只是一个人，甚至是半日工作在几天内完成的软件；  

小型：一个人半年内完成的 2000 行以内的程序；

中型： 5 个人在 1 年多的时间内完成的 5000-50000 行的程序；

大型： 5-10 人在两年内完成的 50000-100000 行的程序；

甚大型： 100-1000 人参加用 4-5 年完成的具有 100 ， 0000 行的软件项目；

极大型： 2000-5000 人参加， 10 年内完成的 1000 万行以内的程序；

以上摘自：《软件工程概论》   郑人杰、殷人民编

这样的观点是以代码行作为计量标准的，认为代码行多的自然项目也就大了。

一个java类标准代码行数范围大概是多少

以1000行为准，超过千行就要考虑类拆分了。

类的代码行数没有特定的行数限制规范。根据实际情况决定。

对于经常使用的java类，代码行数应该尽可能的少，这样能减少java类的加载时间，减少内存频繁占用和回收。如果类过大，java类加载会耗时并且占用内存大。容易引起内存回收。

急求大神发几个java 300行代码的小程序 简单点的

/**

* 文件名：Operation.java 2014-1-2 下午3:06:37

* @author Administrator

*/

package cc.icoc.javaxu.action;

import java.util.ArrayList;

import java.util.Scanner;

import cc.icoc.javaxu.datas.StudentInfo;

/**

* @author 许仕永

* 创建时间: 2014 2014-1-2 下午3:06:37

*/

public class Operation

{

int stuNo,stuAge;

String stuName,stuClass,stuSex;

ArrayListStudentInfo list;

/**程序入口

* @param args

*/

public static void main(String[] args)

{

// TODO Auto-generated method stub

new Operation().operation();

}

private int inputInt()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextInt();

}

private String inputStr()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextLine();

}

private void operation()

{

// TODO Auto-generated method stub

if(list == null)

{

list = new ArrayListStudentInfo();

}

while(true)

{

System.out.println("\t\t\t学生信息管理系统\n");

System.out.println("1.信息查阅");

System.out.println("2.信息查询");

System.out.println("3.信息录入");

System.out.println("4.退出系统");

int what = inputInt();

if ( what == 1 )

{

getInfo();

} else if ( what == 2 )

{

allSerach();

} else if ( what == 3 )

{

inputInfo();

} else if( what == 4 )

{

System.out.println("已经退出系统");

System.exit(0);

}

}

}

/**

* 获取全部学生的信息列表

*/

private void getInfo()

{

if(!list.isEmpty())

{

for ( int i = 0; i list.size(); i++ )

{

System.out.println(list.get(i));

}

}

}

/**

* 执行查找

*/

private void allSerach()

{

System.out.println("1.输入学号进行查询");

System.out.println("2.输入姓名进行查询");

int what = inputInt();

if(what == 1)

{

System.out.println("请输入学号：");

search(inputInt());

}

else

{

System.out.println("请输入姓名：");

search(inputStr());

}

}

/**

* 按学生姓名查询学生信息

* @param name 学生姓名

*/

private StudentInfo search(String name)

{

for ( int i = 0; i list.size(); i++ )

{

if(list.get(i).getStuName().equals(name))

{

System.out.println(list.get(i));

return list.get(i);

}

}

System.out.println("未查询到该名字的学生");

return null;

}

/**

* 按学号查询学生信息

* @param id 学号

*/

private StudentInfo search(int id)

{

for ( int i = 0; i list.size(); i++ )

{

if(list.get(i).getStuNo()==id)

{

System.out.println(list.get(i));

return list.get(i);

}

}

System.out.println("未查询到该学号的学生");

return null;

}

/**

* 录入学生信息

*/

private void inputInfo()

{

try

{

System.out.print("请输入学生学号：\n");

stuNo = inputInt();

System.out.print("请输入学生姓名：\n");

stuName = inputStr();

System.out.print("请输入学生性别：\n");

stuSex = inputStr();

System.out.print("请输入学生年龄：\n");

stuAge = inputInt();

System.out.print("请输入学生班级：\n");

stuClass = inputStr();

list.add(new StudentInfo(stuNo, stuAge, stuName, stuSex, stuClass));

} catch (Exception e)

{

// TODO: handle exception

System.out.println("不允许为空，请重新输入");

}

}

}

package cc.icoc.javaxu.action;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class Stu

{

int countStu = 0;

int sum = 0;

int avg = 0;

ListStuBean list = new ArrayListStu.StuBean();

public static void main(String[] args)

{

new Stu().go();

}

private void go()

{

A:while(true)

{

//构造实体Bean来存储学生成绩

StuBean bean = new StuBean();

System.out.println("请输入成绩：");

System.out.println("语文：");

bean.setYuwen(scanner());

System.out.println("数学：");

bean.setMath(scanner());

//获取英语成绩

System.out.println("英语：");

bean.setEnglish(scanner());

//存入容器

list.add(bean);

for ( int i = 0; i list.size(); i++ )

{

sum += list.get(i).english+list.get(i).math+list.get(i).yuwen;

}

avg = sum / (3*list.size());

System.out.println("当前有"+list.size()+"条学生记录，所有学生总分="+sum+"平均分为"+avg);

//输入y继续录入学生信息，输入x退出

System.out.println("\n已成功录入一个学生的数据，是否继续/退出(y/x)");

if("x".equals(scannerString()))

break A;

}

}

/**输入*/

private int scanner()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextInt();

}

/**输入*/

private String scannerString()

{

Scanner scanner = new Scanner(System.in);

return scanner.nextLine();

}

class StuBean

{

int math;

int yuwen;

int english;

public int getMath()

{

return math;

}

public void setMath(int math)

{

this.math = math;

}

public int getYuwen()

{

return yuwen;

}

public void setYuwen(int yuwen)

{

this.yuwen = yuwen;

}

public int getEnglish()

{

return english;

}

public void setEnglish(int english)

{

this.english = english;

}

}

}

/**

* 文件名：StudentInfo.java 2014-1-2 下午3:07:29

* @author Administrator

*/

package cc.icoc.javaxu.datas;

/**

* @author 许仕永

* 创建时间: 2014 2014-1-2 下午3:07:29

*/

public class StudentInfo

{

int stuNo,stuAge;

String stuName,stuSex,stuClass;

public StudentInfo(int stuNo, int stuAge, String stuName, String stuSex, String stuClass)

{

super();

this.stuNo = stuNo;

this.stuAge = stuAge;

this.stuName = stuName;

this.stuSex = stuSex;

this.stuClass = stuClass;

}

public int getStuNo()

{

return stuNo;

}

public void setStuNo(int stuNo)

{

this.stuNo = stuNo;

}

public int getStuAge()

{

return stuAge;

}

public void setStuAge(int stuAge)

{

this.stuAge = stuAge;

}

public String getStuName()

{

return stuName;

}

public void setStuName(String stuName)

{

this.stuName = stuName;

}

public String getStuSex()

{

return stuSex;

}

public void setStuSex(String stuSex)

{

this.stuSex = stuSex;

}

public String getStuClass()

{

return stuClass;

}

public void setStuClass(String stuClass)

{

this.stuClass = stuClass;

}

@Override

public String toString()

{

// TODO Auto-generated method stub

String s = "学号："+getStuNo()+"\t姓名："+getStuName()+" \t性别："+getStuSex()+"\t年龄："+getStuAge()+"\t班级："+getStuClass();

return s;

}

}

谁帮我写一段300行左右的代码？

这个计算器可是我自己写了好几天才写好的耶，你能在网上找到？

计算器：

// Calculator.java

public class Calculator {

private static final char NO_OP = '\0';

private static final char PLUS = '+';

private static final char SUBTRACT = '-';

private static final char MULTIPLY = '*';

private static final char DIVIDE = '/';

private float number1 = 0.0F;

//private float number2 = Float.NaN;

private char operator = NO_OP;

//等于运算

public String opEquals(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = NO_OP;

number1 = result;

return Float.toString(result);

}

//加法运算

public String opAdd(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = PLUS;

number1 = result;

return Float.toString(result);

}

//减法运算

public String opSubtract(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = SUBTRACT;

number1 = result;

return Float.toString(result);

}

//乘法运算

public String opMultiply(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = MULTIPLY;

number1 = result;

return Float.toString(result);

}

//除法运算

public String opDivide(String number) {

float result;

if ( operator == NO_OP ) {

result = parseNumber(number);

} else {

result = performOperation(parseNumber(number));

}

operator = DIVIDE;

number1 = result;

return Float.toString(result);

}

//处理运算符

private float performOperation(float number2) {

float result = 0.0F;

switch ( operator ) {

case PLUS:

result = number1 + number2;

break;

case SUBTRACT:

result = number1 - number2;

break;

case MULTIPLY:

result = number1 * number2;

break;

case DIVIDE:

result = number1 / number2;

break;

}

return result;

}

//将字符串类型转换为浮点型

private static float parseNumber(String number) {

float real_number;

try {

real_number = Float.parseFloat(number);

} catch (NumberFormatException e) {

real_number = Float.NaN;

}

return real_number;

}

}

GUI程序：

// CalculatorGUI.java

import java.awt.*;

import java.awt.event.*;

public class CalculatorGUI {

// 定义按钮

private Button key0, key1, key2, key3, key4;

private Button key5, key6, key7, key8, key9;

private Button keyequal, keyplus, keyminus;

private Button keyperiod, keymult, keydiv;

// 定义存放按钮的区域

private Panel buttonArea;

// 定义存放运算结果的区域

private Label answer;

// 用来实现运算功能的类的对象实例化

private Calculator calculator;

private boolean readyForNextNumber;

public CalculatorGUI() {

calculator = new Calculator();

readyForNextNumber = true;

answer = new Label("0.0",Label.RIGHT);

key0 = new Button("0");

key1 = new Button("1");

key2 = new Button("2");

key3 = new Button("3");

key4 = new Button("4");

key5 = new Button("5");

key6 = new Button("6");

key7 = new Button("7");

key8 = new Button("8");

key9 = new Button("9");

keyequal = new Button("=");

keyplus = new Button("+");

keyminus = new Button("-");

keymult = new Button("*");

keydiv = new Button("/");

keyperiod = new Button(".");

buttonArea = new Panel();

}

public void launchFrame() {

buttonArea.setLayout(new GridLayout(4,4));

buttonArea.add(key7);

buttonArea.add(key8);

buttonArea.add(key9);

buttonArea.add(keyplus);

buttonArea.add(key4);

buttonArea.add(key5);

buttonArea.add(key6);

buttonArea.add(keyminus);

buttonArea.add(key1);

buttonArea.add(key2);

buttonArea.add(key3);

buttonArea.add(keymult);

buttonArea.add(key0);

buttonArea.add(keyperiod);

buttonArea.add(keyequal);

buttonArea.add(keydiv);

// 设置事件接收句柄

OpButtonHanlder op_handler = new OpButtonHanlder();

NumberButtonHanlder number_handler = new NumberButtonHanlder();

key0.addActionListener(number_handler);

key1.addActionListener(number_handler);

key2.addActionListener(number_handler);

key3.addActionListener(number_handler);

key4.addActionListener(number_handler);

key5.addActionListener(number_handler);

key6.addActionListener(number_handler);

key7.addActionListener(number_handler);

key8.addActionListener(number_handler);

key9.addActionListener(number_handler);

keyperiod.addActionListener(number_handler);

keyplus.addActionListener(op_handler);

keyminus.addActionListener(op_handler);

keymult.addActionListener(op_handler);

keydiv.addActionListener(op_handler);

keyequal.addActionListener(op_handler);

// 新建一个帧，并且加上消息监听

Frame f = new Frame("计算器");

f.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

f.setSize(200, 200);

f.add(answer, BorderLayout.NORTH);

f.add(buttonArea, BorderLayout.CENTER);

f.setVisible (true);

}

//响应按钮事件，并根据不同的按钮事件进行不同的运算

private class OpButtonHanlder implements ActionListener {

public void actionPerformed(ActionEvent event) {

char operator = event.getActionCommand().charAt(0);

String result = "";

switch ( operator ) {

case '+':

result = calculator.opAdd(answer.getText());

break;

case '-':

result = calculator.opSubtract(answer.getText());

break;

case '*':

result = calculator.opMultiply(answer.getText());

break;

case '/':

result = calculator.opDivide(answer.getText());

break;

case '=':

result = calculator.opEquals(answer.getText());

break;

}

answer.setText(result);

readyForNextNumber = true;

}

}

//处理连续运算时主界面的显示

private class NumberButtonHanlder implements ActionListener {

public void actionPerformed(ActionEvent event) {

if ( readyForNextNumber ) {

answer.setText(event.getActionCommand());

readyForNextNumber = false;

} else {

answer.setText(answer.getText() + event.getActionCommand().charAt(0));

}

}

}

//主函数，也是该应用程序的执行入口处

public static void main(String[] args) {

CalculatorGUI calcGUI = new CalculatorGUI();

calcGUI.launchFrame();

}

}

注意：运行的是GUI程序