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java三百行长度的代码 java代码行数

急求大神发几个java 300行代码的小程序 简单点的

/**

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* 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;

}

}

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。

求一Java代码,要简单的。大概一百多行的的。

题目:一球从100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在 第10次落地时,共经过多少米?第10次反弹多高?

这个题目,下面我会贴出来两种代码。其实这个题目,我烦了简单计算,想搞得有趣味性一点,结果耽误了好几天时间,最后发现搞的也不好。

先第一种,为了解题而解题。

==== Main.java ====

public class Main {

private double TotalHeight = 100;

private double CurHeight = 50;

public void drop(int times) {

if ((times - 1) == 0) {

return;

}

setTotalHeight(getTotalHeight() + 2 * getCurHeight());

setCurHeight(getCurHeight() / 2);

drop(times - 1);

}

public double getTotalHeight() {

return TotalHeight;

}

public void setTotalHeight(double totalHeight) {

TotalHeight = totalHeight;

}

public double getCurHeight() {

return CurHeight;

}

public void setCurHeight(double curHeight) {

CurHeight = curHeight;

}

public static void main(String[] args) {

Main main = new Main();

main.drop(2);

System.out.println("Total height is " +

main.getTotalHeight());

System.out.println("Current height is " +

main.getCurHeight());

}

}

==== 然后是第二种 =====

==== Main.java ====

package main;

import javax.swing.JFrame;

import panel.BallPanel;

import time.Delay;

public class MainFrame extends JFrame {

public MainFrame(String title) {

super(title);

}

public static void main(String[] args) {

Delay delay = new Delay();

MainFrame frame = new MainFrame("Hello JFrame");

BallPanel ballPanel = new BallPanel();

frame.add(ballPanel);

frame.setSize(500, 500);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

delay.initDelay();

ballPanel.setDelay(delay.getDelay());

ballPanel.loopDrop(0);

}

}

==== Delay.java ====

package time;

public class Delay {

public void initDelay() {

int g = 10;

int i = 0;

double s, t, t0 = 0.0;

delay = new int[100];

for (s = 100; s 10100; s += 100) {

t = Math.sqrt(2 * s / g);

delay[i++] = (int) ((t - t0) * 100);

t0 = t;

}

}

public int[] getDelay() {

return delay;

}

private int delay[];

}

==== BallPanel.java ====

package panel;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JPanel;

public class BallPanel extends JPanel {

public BallPanel() {

super();

}

public void paint(Graphics g) {

g.clearRect(0, 0, this.getWidth(), this.getHeight());

g.setColor(Color.BLUE);

g.fillOval(250, ballCenter, 30, 30);

}

public void loopDrop(int height) {

int i;

if (this.height == height) { // At bottom

for (i = 0; i targetHeight; i += MUL) {

ballCenter = this.height - i;

this.repaint();

try {

Thread.sleep(delay[(targetHeight - i - 1) / MUL]);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

loopDrop(this.height - i);

} else { // At top

for (i = height; i this.height; i += MUL) {

ballCenter = i;

this.repaint();

try {

Thread.sleep(delay[(i - height) / MUL]);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

targetHeightV = targetHeightV / 2;

targetHeight = targetHeightV;

if (targetHeight != 0) {

loopDrop(i);

}

}

}

public void setDelay(int delay[]) {

this.delay = delay;

}

private int extracted() {

return 100 * MUL;

}

private int targetHeight = extracted();

private int targetHeightV = extracted();

private int ballCenter = 0;

private int height = extracted();

private int delay[];

private final int MUL = 4;

}

其实所谓的第二种,是用的JFrame在JPanel上画图,直观的展示出来每次弹起来的效果。因为100像素实在太小了,所以我做了一个变量MUL,相

当于是等比例扩大的效果。问题就是弹不到10次距离就用光了,所以。。。。。权当娱乐了。。当然可以等比例在放大,例如100M看成是10000像素,这

样能多弹几次。这个程序,最后球就在那里不动了,程序不会自己退出。

求基础级java代码,150-200行,自己写的

我有计算器程序

import javax.swing.*;

import javax.swing.border.Border;

import java.awt.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.math.BigDecimal;

import java.math.RoundingMode;

import java.util.HashMap;

/**

* 我的计算器。MyCalculator 继承于 JFrame,是计算器的界面

*/

public class Calculator extends JFrame {

/**

*

*/

private static final long serialVersionUID = 1L;

private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5);

private JTextField textbox = new JTextField("0");

private CalculatorCore core = new CalculatorCore();

private ActionListener listener = new ActionListener() {

public void actionPerformed(ActionEvent e) {

JButton b = (JButton) e.getSource();

String label = b.getText();

String result = core.process(label);

textbox.setText(result);

}

};

public Calculator(String title) throws HeadlessException {

super(title); // 调用父类构造方法

setupFrame(); // 调整窗体属性

setupControls(); // 创建控件

}

private void setupControls() {

setupDisplayPanel(); // 创建文本面板

setupButtonsPanel(); // 创建按钮面板

}

// 创建按钮面板并添加按钮

private void setupButtonsPanel() {

JPanel panel = new JPanel();

panel.setBorder(border);

panel.setLayout(new GridLayout(4, 5, 3, 3));

createButtons(panel, new String[]{

"7", "8", "9", "+", "C",

"4", "5", "6", "-", "CE",

"1", "2", "3", "*", "", // 空字符串表示这个位置没有按钮

"0", ".", "=", "/", ""

});

this.add(panel, BorderLayout.CENTER);

}

/**

* 在指定的面板上创建按钮

*

* @param panel 要创建按钮的面板

* @param labels 按钮文字

*/

private void createButtons(JPanel panel, String[] labels) {

for (String label : labels) {

// 如果 label 为空,则表示创建一个空面板。否则创建一个按钮。

if (label.equals("")) {

panel.add(new JPanel());

} else {

JButton b = new JButton(label);

b.addActionListener(listener); // 为按钮添加侦听器

panel.add(b);

}

}

}

// 设置显示面板,用一个文本框来作为计算器的显示部分。

private void setupDisplayPanel() {

JPanel panel = new JPanel();

panel.setLayout(new BorderLayout());

panel.setBorder(border);

setupTextbox();

panel.add(textbox, BorderLayout.CENTER);

this.add(panel, BorderLayout.NORTH);

}

// 调整文本框

private void setupTextbox() {

textbox.setHorizontalAlignment(JTextField.RIGHT); // 文本右对齐

textbox.setEditable(false); // 文本框只读

textbox.setBackground(Color.white); // 文本框背景色为白色

}

// 调整窗体

private void setupFrame() {

this.setDefaultCloseOperation(EXIT_ON_CLOSE); // 当窗体关闭时程序结束

this.setLocation(100, 50); // 设置窗体显示在桌面上的位置

this.setSize(300, 200); // 设置窗体大小

this.setResizable(false); // 窗体大小固定

}

// 程序入口

public static void main(String[] args) throws Exception {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

Calculator frame = new Calculator("我的计算器");

frame.setVisible(true); // 在桌面上显示窗体

}

}

/**

* 计算器核心逻辑。这个逻辑只能处理 1~2 个数的运算。

*/

class CalculatorCore {

private String displayText = "0"; // 要显示的文本

boolean reset = true;

int MaxLen = 30;

private BigDecimal number1, number2;

private String operator;

private HashMapString, Operator operators = new HashMapString, Operator();

private HashMapString, Processor processors = new HashMapString, Processor();

CalculatorCore() {

setupOperators();

setupProcessors();

}

// 为每种命令添加处理方式

private void setupProcessors() {

processors.put("[0-9]", new Processor() {

public void calculate(String command) {

numberClicked(command);

}

});

processors.put("\\.", new Processor() {

public void calculate(String command) {

dotClicked();

}

});

processors.put("=", new Processor() {

public void calculate(String command) {

equalsClicked();

}

});

processors.put("[+\\-*/]", new Processor() {

public void calculate(String command) {

operatorClicked(command);

}

});

processors.put("C", new Processor() {

public void calculate(String command) {

clearClicked();

}

});

processors.put("CE", new Processor() {

public void calculate(String command) {

clearErrorClicked();

}

});

}

// 为每种 operator 添加处理方式

private void setupOperators() {

operators.put("+", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.add(number2);

}

});

operators.put("-", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.subtract(number2);

}

});

operators.put("*", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.multiply(number2);

}

});

operators.put("/", new Operator() {

public BigDecimal process(BigDecimal number1, BigDecimal number2) {

return number1.divide(number2, 30, RoundingMode.HALF_UP);

}

});

}

// 根据命令处理。这里的命令实际上就是按钮文本。

public String process(String command) {

for (String pattern : processors.keySet()) {

if (command.matches(pattern)) {

processors.get(pattern).calculate(command);

break;

}

}

return displayText;

}

// 当按下 CE 时

private void clearErrorClicked() {

if (operator == null) {

number1 = null;

} else {

number2 = null;

}

displayText = "0";

reset = true;

}

// 当按下 C 时,将计算器置为初始状态。

private void clearClicked() {

number1 = null;

number2 = null;

operator = null;

displayText = "0";

reset = true;

}

// 当按下 = 时

private void equalsClicked() {

calculateResult();

number1 = null;

number2 = null;

operator = null;

reset = true;

}

// 计算结果

/**

*

*/

private void calculateResult() {

number2 = new BigDecimal(displayText);

Operator oper = operators.get(operator);

if (oper != null) {

try {

BigDecimal result = oper.process(number1, number2);

displayText = result.toString();

} catch (RuntimeException e) {

clearClicked();//将计算器置为初始状态

JOptionPane.showMessageDialog(null,"不能用零作除数","出错了",JOptionPane.OK_OPTION);

//e.printStackTrace();

}

}

}

// 当按下 +-*/ 时(这里也可以扩展成其他中间操作符)

private void operatorClicked(String command) {

if (operator != null) {

calculateResult();

}

number1 = new BigDecimal(displayText);

operator = command;

reset = true;

}

// 当按下 . 时

private void dotClicked() {

if (displayText.indexOf(".") == -1) {

displayText += ".";

} else if (reset) {

displayText = "0.";

}

reset = false;

}

// 当按下 0-9 时

private void numberClicked(String command) {

if (reset) {

displayText = command;

} else {

if(displayText.length() MaxLen)

displayText += command;

else

JOptionPane.showMessageDialog(null,"输入的数字太长了","出错了",JOptionPane.OK_OPTION);

}

reset = false;

}

// 运算符处理接口

interface Operator {

BigDecimal process(BigDecimal number1, BigDecimal number2);

}

// 按钮处理接口

interface Processor {

void calculate(String command);

}

}

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


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