java三百行代码 java三行表白代码

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java三百行代码，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java三百行代码，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;

}

}

相关问答

Q1: Java代码可以超过2000行

以1000行为准，超过千行就要考虑类拆分了。

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。

如果前期准备得当，设计，建模合理。一般来说，每个类的代码就不会很多，几百行。很早之前看过有前辈说，300行之内。

Q2: 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java三百行代码，你能在网上找到？

计算器java三百行代码：

// 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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