包含java智力大冲浪代码的词条

请求大神帮我解答这道java编程题（填写代码）

此题的Employee类设计有缺陷，缺少员工薪水的属性。根据题意只能写出下面的程序：

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abstract class Employee {

public abstract double earnings();

}

class YearWorker extends Employee {

@Override

public double earnings() {

return 0;

}

}

class MonthWorker extends Employee {

@Override

public double earnings() {

return 0;

}

}

class WeekWorker extends Employee {

@Override

public double earnings() {

return 0;

}

}

class Company {

Employee[] employee;

double salaries = 0;

Company(Employee[] employee) {

this.employee = employee;

}

public double salariesPay() {

salaries = 0;

//计算salaries

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

salaries += employee[i].earnings();

}

return salaries;

}

}

public class HardWork {

public static void main(String[] args) {

Employee[] employee = new Employee[20];

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

if(i % 3 == 0) {

employee[i] = new YearWorker();

}

else if(i % 3 == 1) {

employee[i] = new MonthWorker();

}

else if(i % 3 == 2) {

employee[i] = new WeekWorker();

}

}

Company company = new Company(employee);

System.out.println("公司年工资总额:" + company.salariesPay());

}

}

运行结果：

公司年工资总额:0.0

求JAVA小项目的完整代码

给你个做好了的Java的源程序的记事本，自己看看就行了的，不怎么难的···

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class MyNotepad implements ActionListener{

private JFrame frame=new JFrame("新记事本");

private JTextArea jta=new JTextArea();

private String result="";

private boolean flag=true;

private File f;

private JButton jb=new JButton("开始");

private JTextField jtf=new JTextField(15);

private JTextField jt=new JTextField(15);

private JButton jbt=new JButton("替换为");

private JButton jba=new JButton("全部替换");

private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");

private String value;

private int start=0;

private JFrame jf=new JFrame("查找");

private JFrame jfc=new JFrame("替换");

@Override

public void actionPerformed(ActionEvent e) {

String comm=e.getActionCommand();

if("新建".equals(comm)){

if(!(frame.getTitle().equals("新记事本"))){

if(!flag){

write();

newNew();

}else{

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

}

}

}else if(!(jta.getText().isEmpty())){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

newNew();

}

}else{

newNew();

}

}else if("打开".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

jfc.setDialogType(JFileChooser.OPEN_DIALOG);

int returnVal = jfc.showOpenDialog(null);

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

frame.setTitle(f.getName());

result=read();

flag=false;

value=result;

jta.setText(result);

}

}else if("保存".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

if(flag){

int returnVal = jfc.showDialog(null,"保存为");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

flag=false;

write();

}

}else{

write();

}

}else if("另存".equals(comm)){

JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");

int returnVal = jfc.showDialog(null,"另存");

if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性

f=jfc.getSelectedFile();

write();

}

}else if("退出".equals(comm)){

System.exit(0);

}else if("撤销".equals(comm)){

jta.setText(value);

}else if("剪切".equals(comm)){

value=jta.getText();

jta.cut();

}else if("复制".equals(comm)){

jta.copy();

}else if("粘贴".equals(comm)){

value=jta.getText();

jta.paste();

}else if("删除".equals(comm)){

value=jta.getText();

jta.replaceSelection(null);

}else if("全选".equals(comm)){

jta.selectAll();

}else if("查找".equals(comm)){

value=jta.getText();

jf.add(jtf,BorderLayout.CENTER);

jf.add(jb,BorderLayout.SOUTH);

jf.setLocation(300,300);

jf.pack();

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

}else if("替换".equals(comm)){

value=jta.getText();

GridLayout gl=new GridLayout(3,3);

JLabel jl1=new JLabel("查找内容:");

JLabel jl2=new JLabel("替换为:");

jfc.setLayout(gl);

jfc.add(jl1);

jfc.add(jtf);

jfc.add(jb);

jfc.add(jl2);

jfc.add(jt);

jfc.add(jbt);

JLabel jl3=new JLabel();

JLabel jl4=new JLabel();

jfc.add(jl3);

jfc.add(jl4);

jfc.add(jba);

jfc.setLocation(300,300);

jfc.pack();

jfc.setVisible(true);

jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

}else if("版本".equals(comm)){

JDialog jd=new JDialog(frame,"关于对话框");

jd.setSize(200,200);

JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");

jd.add(l,BorderLayout.CENTER);

jd.setLocation(100,200);

jd.setSize(300,300);

jd.setVisible(true);

// jd.pack();

jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);

}else if("开始".equals(comm)||"下一个".equals(comm)){

String temp=jtf.getText();

int s=value.indexOf(temp,start);

if(value.indexOf(temp,start)!=-1){

jta.setSelectionStart(s);

jta.setSelectionEnd(s+temp.length());

jta.setSelectedTextColor(Color.GREEN);

start=s+1;

jb.setText("下一个");

// value=value.substring(s+temp.length());//不能截取字串

}else {

JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);

jf.dispose();

}

}else if("替换为".equals(comm)){

String temp=jtf.getText();

int s=value.indexOf(temp,start);

if(value.indexOf(temp,start)!=-1){

jta.setSelectionStart(s);

jta.setSelectionEnd(s+temp.length());

jta.setSelectedTextColor(Color.GREEN);

start=s+1;

jta.replaceSelection(jt.getText());

}else {

JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);

jf.dispose();

}

}else if("全部替换".equals(comm)){

String temp=jta.getText();

temp=temp.replaceAll(jtf.getText(), jt.getText());

jta.setText(temp);

}

}

public String read(){

String temp="";

try {

FileInputStream fis = new FileInputStream(f.getAbsolutePath());

byte[] b=new byte[1024];

while(true){

int num=fis.read(b);

if(num==-1)break;

temp=temp+new String(b,0,num);

}

fis.close();

} catch (Exception e1) {

e1.printStackTrace();

}

return temp;

}

public void write(){

try {

FileOutputStream fos=new FileOutputStream(f);

fos.write(jta.getText().getBytes());

fos.close();

} catch (Exception e) {

e.printStackTrace();

}

}

public void newNew(){

frame.dispose();

new MyNotepad();

flag=true;

}

public MyNotepad(){

JMenuBar jmb=new JMenuBar();

String[] menuLab={"文件","编辑","帮助"};

String[][] menuItemLab={{"新建","打开","保存","另存","退出"},

{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},

{"版本"}};

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

JMenu menu=new JMenu(menuLab[i]);

jmb.add(menu);

for(int j=0;jmenuItemLab[i].length;j++){

JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);

menu.add(jmi);

jmi.addActionListener(this);

}

}

frame.setJMenuBar(jmb);

jta.setLineWrap(true);//自动换行

JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板

frame.add(jsp);

jb.addActionListener(this);

jbt.addActionListener(this);

jba.addActionListener(this);

frame.setLocation(200,50);

frame.setSize(620,660);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

new MyNotepad();

}

}

初学者请求java源代码

class Car

{

// 车辆属性

private String brand; // 品牌

private double engineDisplacement;// 排气量

private double speed;// 当前速度

private boolean status;// 启动状态

private double maxSpeed;// 最大速度

public double getSpeed () {

return this.speed;

}

public Car(String brand, double engineDisplacement, double maxSpeed) {

this.brand = brand;

this.engineDisplacement = engineDisplacement;

this.maxSpeed = maxSpeed;

// 其他属性也要有初始值，不然执行出错。

this.speed = 0;

this.status = false;

}

/** 启动 */

public void start() {

this.status = true;

printNowStatus ();

}

/** 关闭（熄火） */

public void stop() {

// 只在速度为0时关闭（貌似楼上两位没仔细看题…）

if (this.speed == 0)

{

this.status = false;

}

printNowStatus ();

}

/** 加速 */

public void speedUp() {

// 只在启动时可以加速

if (this.status)

{

this.speed = this.speed + 20;

if (this.speed this.maxSpeed)

{

this.speed = this.maxSpeed;

}

}

printNowStatus ();

}

/** 减速 */

public void slowDown() {

// 只在启动时可以减速

if (this.status)

{

this.speed = this.speed - 10;

if (this.speed 0)

{

this.speed = 0;

}

}

printNowStatus ();

}

/** 状态打印，在每次启动，加减速，关闭时调用 */

private void printNowStatus () {

System.out.println("轿车【" + this.brand + "】现在的启动状态是：" + this.status + "速度是：" + this.speed +"。");

}

}

public class TestCar

{

public static void main(String[] args)

{

Car myCar = new Car ("红旗", 2, 120);

//启动

myCar.start();

// 循环加速到120

while (myCar.getSpeed() 120)

{

myCar.speedUp();

}

//循环减速

while (myCar.getSpeed() 0)

{

myCar.slowDown();

}

//关闭

myCar.stop();

}

}

/* 直接拿文本写的，我用的电脑没装jdk，楼主自己到Java开发环境下调试，应该没什么问题… */

java一段代码

相当于：System.out.println(test.f());

因为b=a=f();此时的f()已经被子类B重写，所以b=a=f()=2。

即使这么写也是2：

A test = new B();

System.out.println(test.a);

同样，相当于：System.out.println(test.f());

这种情况就是多态了！！

Java编程，填写下面的代码

class NoLowerLetterException extends Exception {

public NoLowerLetterException(String msg) {

super(msg);

}

}

class NoDigitException extends Exception {

public NoDigitException(String msg) {

super(msg);

}

}

class People {

void printLetter(char c) {

if (c = 'a' c = 'z') {

System.out.println(c);

} else {

try {

throw new NoLowerLetterException(String.valueOf(c));

} catch (NoLowerLetterException e) {

e.printStackTrace();

}

}

}

void printDigit(char c) {

if (c = '0' c = '9') {

System.out.println(c);

} else {

try {

throw new NoDigitException(String.valueOf(c));

} catch (NoDigitException e) {

e.printStackTrace();

}

}

}

}

public class ExceptionExample {

public static void main(String args[]) {

People people = new People();

for (int i = 0; i 128; i++) {

// 【代码5】

// //将i转换为char类型，执行people.printLetter()方法，如果出现异常则捕获，并输出异常的错误信息！

people.printLetter((char) i);

}

for (int i = 0; i 128; i++) {

// 【代码6】 //将i转换为char类型，执行people. printDigit

// ()方法，如果出现异常则捕获，并输出异常的错误信息！

people.printDigit((char) i);

}

}

}

求一个简单的JAVA游戏代码，100行左右，谢谢！

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Painter extends JFrame{

/**

*

*/

private static final long serialVersionUID = 8160427604782702376L;

CanvasPanel canvas = new CanvasPanel();;

public Painter() {

super("Star");

this.add(canvas);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.pack();

this.setResizable(false);

this.setLocationRelativeTo(null);

this.setVisible(true);

}

public static void main(String[] args) {

new Painter();

}

}

class CanvasPanel extends JPanel implements ActionListener{

/**

*

*/

private static final long serialVersionUID = -4642528854538741028L;

private JButton[] btn = new JButton[4];

private String[] btn_name = {"+", "-", "R", "L"};

private int center_x = 200, center_y = 200, radius = 100, degree = 0;

public CanvasPanel() {

this.setPreferredSize(new Dimension(400, 500));

this.setLayout(null);

for(int i = 0; i 4; i++) {

btn[i] = new JButton(btn_name[i]);

btn[i].setBounds(160 + i * 60, 425, 50, 50);

btn[i].addActionListener(this);

this.add(btn[i]);

}

}

@Override

public void paintComponent(Graphics g) {

super.paintComponent(g);

for(int i = 0; i 5; i++) {

g.drawLine( (int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i))),

(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i))),

(int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i + 144))),

(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i + 144))));

}

}

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if(e.getActionCommand() == "+") {

if(radius 200)

radius += 2;

repaint();

} else if(e.getActionCommand() == "-") {

if(radius 0)

radius -= 2;

repaint();

} else if(e.getActionCommand() == "R") {

degree = (degree + 2) % 360;

repaint();

} else if(e.getActionCommand() == "L") {

degree = (degree - 2) % 360;

repaint();

}

}

}