java开发文档编写一个JAVA程序

用java开发一个应用程序，用它来完成文件的复制

这个是复制文件的基本操作，多个文件可以通过listFiles方法遍历获取单个文件进行操作 public static void copyFile(File orig, File dest) { try { OutputStreamWriter writer = new OutputStreamWriter( new FileOutputStream(dest), "utf-8"); BufferedWriter bw = new BufferedWriter(writer); InputStreamReader reader = new InputStreamReader( new FileInputStream(orig), "utf-8"); BufferedReader br = new BufferedReader((reader)); String content = ""; String line = null; while ((line = br.readLine()) != null) { content = content + line + " "; } bw.write(content); bw.flush(); br.close(); bw.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }

使用记事本开发java程序的步骤

一，写代码，保存为java文件 二，编译文件java 三，运行编译产生的class文件 //别以为用记事本开发很帅，没用的。

还是找个靠谱点的IDE。

java web的二次开发需要什么文档？

个人觉得，如果连.java的源文件都没有，那你们领导给你的“二次开发”任务，估计也就是改改页面，美化一下而已了。

详细设计文档和数据设计文档可能还有参考的价值。

编写一个JAVA程序

展开全部 import java.util.Date; class Telephone{ private String brand; private String phoneNum; private int seconds; private double rate; public String getBrand() { return brand; } public void setBrand(String brand) { this.brand = brand; } public String getPhoneNum() { return phoneNum; } public void setPhoneNum(String phoneNum) { this.phoneNum = phoneNum; } public int getSeconds() { return seconds; } public void setSeconds(int seconds) { this.seconds = seconds; } public double getRate() { return rate; } public void setRate(double rate) { this.rate = rate; } public double charge(){ return seconds/60*rate; } public String toString(){ return "品牌"+brand+"号码"+phoneNum+"通话时长"+seconds+"费率"+rate; } } class Mobilephone extends Telephone{ private Type; private Date callInTime; public double charge(){ System.out.println("Mobilephone的计费方法:"); return super.charge(); } public String toString(){ return "这是Mobliephone的显示方法:"+super.toString(); } } public class TestExtends { public static void main(String[] args) { Telephone phone=new Telephone(); phone.setBrand("nokia"); phone.setPhoneNum("13912341234"); phone.setRate(0.2); phone.setSeconds(300); System.out.println("Telephone本次话费:"+phone.charge()+"元"); System.out.println(phone); System.out.println("===========华丽丽的分割线==========="); Mobilephone mPhone =new Mobilephone(); mPhone.setBrand("motorolar"); mPhone.setPhoneNum("15912345432"); mPhone.setRate(0.25); mPhone.setSeconds(300); System.out.println("Mobilephone的本次消费"+mPhone.charge()+"元"); System.out.println(mPhone); System.out.println("希望对你有帮助"); } }