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···

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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();

}

}

Java项目实训模拟网上超市购物结算功能

使用结构体+数组，就可以 了

~

~

~

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~~~~~~~~~~~~~~~~~~~~~~~~~

根据以下任务要求，编写Java应用程序？

按照题目要求编写的Java程序如下

注意 请使用你的真实姓名和班级替换Test类中

创建Student对象stu时用的"张三"和"20计算机应用01班"

import java.util.Scanner;

class Student{

private String name,classname;

private int starnum,scorenum;

private int[] scores;

public void setStarNum(int n){

this.starnum=n;

}

public Student(String name,String classname,int scorenum){

this.name=name;

this.classname=classname;

this.scorenum=scorenum;

}

public String getName(){

return this.name;

}

public void printStar(){

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

for(int j=0;j2*i+1;j++){

System.out.print("*");

}

System.out.println();

}

}

public void setScore(){

Scanner sc=new Scanner(System.in);

scores=new int[scorenum];

System.out.print("请输入各科成绩：");

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

scores[i]=sc.nextInt();

}

}

public void showInfo(){

System.out.print(name+"同学，你所在的班级是"+classname+"，你各科考试成绩分别为：");

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

if(i==scorenum-1)

System.out.print(scores[i]);

else

System.out.print(scores[i]+"，");

}

System.out.println();

}

public float getAvg(){

float sum=0;

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

sum=sum+scores[i];

}

return sum/scorenum;

}

}

public class Test{

public static void main(String[] args){

Student stu=new Student("张三","20计算机应用01班",5);

stu.setStarNum(4);

stu.printStar();

stu.setScore();

stu.showInfo();

if(stu.getAvg()60){

System.out.println(stu.getName()+"是不合格学生");

}else{

System.out.println(stu.getName()+"是个合格学生");

}

}

}

java实验题，求代码和运行方式！

下面是第一题，采纳此答案发第二题代码

========分割线=========

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.util.Scanner;

public class Q1 {

public static void main(String[] args) {

try {

Scanner scanner=new Scanner(System.in);

String data = scanner.nextLine();

File file = new File("java\\code");

if (!file.exists()) {

file.mkdirs();

}

File file1=new File(file,"mydata.txt");

if (!file1.exists()) {

file1.createNewFile();

}

FileWriter fw = new FileWriter(file1.getAbsoluteFile());

BufferedWriter bw = new BufferedWriter(fw);

bw.write(data);

bw.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

Java实验，代码怎么写？

Shape.java接口代码

public interface Shape {

public static final double PI = 3.14d;

public double area();

}

Circle.java圆类代码

public class Circle implements Shape {

private double radius;

public Circle(double radius) {

  this.radius = radius;

}

@Override

public double area() {

  return PI * this.radius * this.radius;

}

public double perimeter() {

  return 2 * PI * this.radius;

}

}

Cylinder.java圆柱体类代码

public class Cylinder extends Circle {

private double height;

public Cylinder(double radius, double height) {

  super(radius);

  this.height = height;

}

public double area() {

  return 2 * super.area() + super.perimeter() * this.height;

}

public double volume() {

  return super.area() * this.height;

}

}

X5_3_6.java主类代码

public class X5_3_6 {

public static void main(String[] args) {

  Circle cir1 = new Circle(5);

  System.out.println("圆的面积为：" + cir1.area());

  System.out.println("圆的周长为：" + cir1.perimeter());

  Cylinder cy1 = new Cylinder(10, 15);

  System.out.println("圆柱体的表面积为：" + cy1.area());

  System.out.println("圆柱体的体积为：" + cy1.volume());

}

}

上面是我写的代码，下图是执行结果，麻烦看一下，是否可以。

一个简单的Java程序代码？

package com.zpp;public class Charge {

public static void main(String [] args) {

if(args.length ==0) {

System.out.println("parameter error!");

System.out.println("java com.zpp.Charge [int]");

return;

}

int min = Integer.parseInt(args[0]);

double money = 0.0;

if (min = 0) {

money =0.0;

System.out.println("not money");

} else if (min = 60) {

money = 2.0;

} else {

money = 2.0 + (min - 60) * 0.01;

}

System.out.println("please pay: " + money);

}

} 编译：javac -d . Charge.java运行：java com.zpp.Charge 111

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