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如何编写高效java代码 如何写出优秀的java代码
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如何写代码新手教学
编写需要学习编程语言如何编写高效java代码，例如c语言，java等。
1、有基础的学员：对于没有任何编程基础的初学者来说，要想快速入门编程，最为有效的方式之一就是与专业人士进行交流，在专业人士的指导下进行学习会有比较高的学习效率，而且也会有一个系统的学习过程，当前可以充分利用互联网来开辟自己的交流渠道。
2、无基础的学员：对于已经有一定编程基础的同学来说，边用边学往往会有更高的学习效率，比如程序员在学习一门新的编程语言时，如果采用听课的方式学习也许并不是最高效的。
很多程序员是直接看代码案例，然后就开始尝试应用，然后再逐渐提升应用的熟练程度，因为对于已经有成熟编程思想的程序员来说，不同的编程语言仅仅是语法上的不同，思想终归是统一的。
编程语言难易
编程语言的语法并不难掌握，但是要想熟练运用编程语言，一定要多做实验，这个过程是无法忽略的，也没有任何捷径，编程语言用得多如何编写高效java代码了，自然也就熟练了。对于很多应用级程序员来说，编程并没有太多需要思考的地方，也不需要设计复杂的算法。
如果要想在程序设计领域走得更远，熟练运用编程语言仅仅是第一步，还需要有自己的主攻方向，并且能够围绕自己的主攻方向不断深入，掌握相应的研究方法，最终成长为一名研发级程序员。
相关问答
Q1: 根据要求编写java代码，急求，答案正确加100分！求高手！
服务器端如何编写高效java代码：
package com.lqq.service;
import java.io.File;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.List;
import com.lqq.vo.QueryType;
import com.lqq.vo.Student;
public class DealClientRequest implements Runnable
{
private Socket s = null;
private ParserXML p = new ParserXML(new File("students.xml"));
public DealClientRequest(Socket s)
{
this.s = s;
}
@Override
public void run()
{
if(s != null)
{
try
{
ObjectInputStream ois = new ObjectInputStream(s.getInputStream());
ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());
QueryType qt = (QueryType) ois.readObject();
if(qt.getQueryType() == 1)//单查
{
System.out.println("执行单查如何编写高效java代码，查询的名字= " + qt.getQueryName());
Student stu = p.getStudent(qt.getQueryName());
oos.writeObject(stu);
}else if(qt.getQueryType() == 2)//全查
{
System.out.println("执行全查");
ListStudent list = p.getAllStudent();
for(int i = 0; i list.size(); i++)
{
Student stu = list.get(i);
oos.writeObject(stu);
}
}
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
}
}
}
}
*************************
package com.lqq.service;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class MainService
{
private ServerSocket ss;
public void startService() throws IOException
{
ss = new ServerSocket(10086);
while(true)
{
System.out.println("服务器在10086等待...");
Socket s = ss.accept();
new Thread(new DealClientRequest(s)).start();
System.out.println("启动处理线程成功");
}
}
}
******************
package com.lqq.service;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import com.lqq.vo.Student;
public class ParserXML
{
private DocumentBuilderFactory bdf;
private DocumentBuilder db;
private Document dom;
public ParserXML(File file)
{
bdf = DocumentBuilderFactory.newInstance();
try
{
db = bdf.newDocumentBuilder();
dom = db.parse(file);
} catch (Exception e)
{
e.printStackTrace();
}
}
public ListStudent getAllStudent()
{
ListStudent stu = new ArrayListStudent();
Element root = dom.getDocumentElement();
NodeList list = root.getElementsByTagName("stu");
for(int i = 0; i list.getLength(); i++)
{
Element e = (Element) list.item(i);
Student st = new Student();
NodeList names = e.getElementsByTagName("name");
if(names.getLength() == 1)
{
Element name = (Element)names.item(0);
Text text = (Text) name.getFirstChild();
st.setStuName(text.getNodeValue());
}
NodeList sexs = e.getElementsByTagName("sex");
if(sexs.getLength() == 1)
{
Element name = (Element)sexs.item(0);
Text text = (Text) name.getFirstChild();
st.setStuGender(text.getNodeValue());
}
NodeList ages = e.getElementsByTagName("age");
if(ages.getLength() == 1)
{
Element name = (Element)ages.item(0);
Text text = (Text) name.getFirstChild();
st.setStuAge(Integer.parseInt(text.getNodeValue()));
}
NodeList classs = e.getElementsByTagName("class");
if(classs.getLength() == 1)
{
Element name = (Element)classs.item(0);
Text text = (Text) name.getFirstChild();
st.setStuClassName(text.getNodeValue());
}
stu.add(st);
}
return stu;
}
public Student getStudent(String stuName)
{
ListStudent list = this.getAllStudent();
for(int i = 0; i list.size(); i++)
{
Student st = list.get(i);
if(st.getStuName().equals(stuName))
return st;
}
return null;
}
}
*************
package com.lqq.service;
import java.io.IOException;
public class Service
{
public static void main(String[] args)
{
MainService ms = new MainService();
try
{
ms.startService();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
*******
package com.lqq.vo;
import java.io.Serializable;
public class QueryType implements Serializable
{
private static final long serialVersionUID = 8713870836629046060L;
/**
* 1 单查
* 2 全查
*/
private byte queryType;
private String queryName;
public byte getQueryType()
{
return queryType;
}
public void setQueryType(byte queryType)
{
this.queryType = queryType;
}
public String getQueryName()
{
return queryName;
}
public void setQueryName(String string)
{
this.queryName = string;
}
}
************
package com.lqq.vo;
import java.io.Serializable;
public class Student implements Serializable
{
private static final long serialVersionUID = -6087251613589160139L;
private String stuName;
private int stuAge;
private String stuGender;
private String stuClassName;
@Override
public String toString()
{
return "姓名: " + stuName + "\t性别: " + stuGender
+ "\t年龄: " + stuAge + "\t班级: " + stuClassName;
}
public String getStuName()
{
return stuName;
}
public void setStuName(String stuName)
{
this.stuName = stuName;
}
public int getStuAge()
{
return stuAge;
}
public void setStuAge(int stuAge)
{
this.stuAge = stuAge;
}
public String getStuGender()
{
return stuGender;
}
public void setStuGender(String stuGender)
{
this.stuGender = stuGender;
}
public String getStuClassName()
{
return stuClassName;
}
public void setStuClassName(String stuClassName)
{
this.stuClassName = stuClassName;
}
}
*************
?xml version="1.0" encoding="UTF-8"?
stus
stu
name令狐冲/name
age12/age
class华山派/class
sex男/sex
/stu
stu
name东方不败/name
age22/age
class日月神教/class
sex女/sex
/stu
stu
name岳不群/name
age23/age
class华山派/class
sex妖/sex
/stu
stu
name风清扬/name
age88/age
class华山派/class
sex男/sex
/stu
/stus
客户端如何编写高效java代码：
package com.lqq.c;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import com.lqq.vo.QueryType;
import com.lqq.vo.Student;
public class AllQuery implements Runnable
{
private Socket s;
public AllQuery(QueryType qt)
{
try
{
s = new Socket("localhost", 10086);
ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());
oos.writeObject(qt);
} catch (UnknownHostException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
}
@Override
public void run()
{
if(s != null)
{
try
{
ObjectInputStream ois = new ObjectInputStream(s.getInputStream());
Student stu = (Student) ois.readObject();
Client c = new Client();
while(stu != null)
{
c.showStudentInfo(stu);
stu = (Student) ois.readObject();
}
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
}
}
}
}
**************
package com.lqq.c;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Scanner;
import com.lqq.vo.QueryType;
import com.lqq.vo.Student;
public class Client
{
public void showStudentInfo(Student stu)
{
if(stu != null)
{
System.out.println(stu);
}
}
public void showMenu()
{
System.out.println("\t\t菜 单");
System.out.println("\t1.单 查");
System.out.println("\t2.全 查");
System.out.println("\t0.退 出");
}
public String getUserInput()
{
Scanner scan = new Scanner(System.in);
System.out.println("请输入:");
return scan.next();
}
public void requestQuery(String userSelect)
{
if(userSelect != null)
{
if("1".equals(userSelect.trim()))
{
QueryType qt = new QueryType();
qt.setQueryType((byte)1);
Scanner san = new Scanner(System.in);
System.out.println("请输入查询的学生名字:");
String queryStuName = san.next();
qt.setQueryName(queryStuName);
this.executeQeury(qt);
}else if("2".equals(userSelect.trim()))
{
QueryType qt = new QueryType();
qt.setQueryType((byte)2);
this.executeQeury(qt);
}else if("0".equals(userSelect.trim()))
{
System.exit(0);
}
else
{
System.out.println("输入有误");
}
}
}
public void executeQeury(QueryType qt)
{
try
{
Socket s = new Socket("localhost", 10086);
ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());
oos.writeObject(qt);
System.out.println("请求发送完毕");
ObjectInputStream ois = new ObjectInputStream(s.getInputStream());
if(qt.getQueryType() == 1)
{
Student stu = (Student) ois.readObject();
showStudentInfo(stu);
}else if(qt.getQueryType() == 2)
{
new Thread(new AllQuery(qt)).start();
}
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
Client client = new Client();
while(true)
{
client.showMenu();
client.requestQuery(client.getUserInput());
}
}
}
**********
package com.lqq.vo;
import java.io.Serializable;
public class QueryType implements Serializable
{
private static final long serialVersionUID = 8713870836629046060L;
/**
* 1 单查
* 2 全查
*/
private byte queryType;
private String queryName;
public byte getQueryType()
{
return queryType;
}
public void setQueryType(byte queryType)
{
this.queryType = queryType;
}
public String getQueryName()
{
return queryName;
}
public void setQueryName(String string)
{
this.queryName = string;
}
}
**********
package com.lqq.vo;
import java.io.Serializable;
public class Student implements Serializable
{
private static final long serialVersionUID = -6087251613589160139L;
private String stuName;
private int stuAge;
private String stuGender;
private String stuClassName;
@Override
public String toString()
{
return "姓名: " + stuName + "\t性别: " + stuGender
+ "\t年龄: " + stuAge + "\t班级: " + stuClassName;
}
public String getStuName()
{
return stuName;
}
public void setStuName(String stuName)
{
this.stuName = stuName;
}
public int getStuAge()
{
return stuAge;
}
public void setStuAge(int stuAge)
{
this.stuAge = stuAge;
}
public String getStuGender()
{
return stuGender;
}
public void setStuGender(String stuGender)
{
this.stuGender = stuGender;
}
public String getStuClassName()
{
return stuClassName;
}
public void setStuClassName(String stuClassName)
{
this.stuClassName = stuClassName;
}
}
时间太紧，没有完善代码，基本功能实现如何编写高效java代码了，代码没有优化，你自己再改改，希望可以帮到你
Q2: 如何用java编写这一段代码
给
文本框
加上onchange
监听，监听事件里取得文本框里的值，然后判断此输入的数字是否为100的整数倍，不是就弹出对话框，是就不作任何处理
至于判断是否为100整数倍，就用取得的值 %
100，判断结果是否为0，是的话就是对的，反正就是错的
Q3: java写一个自动程序开始先怎么写
使用Eclipse编写自己的第一个Java代码。
编写如下：
1、首先打开自己安装的Eclipse软件。
2、然后选择File-New-JavaProject。
3、然后找到工程打开，右击src选择-New-Class。
4、填入类名，选择下面的publicstaticvoidmain(String[]args)。
5、然后写入代码publicclassDemo{publicstaticvoidmain(String[]args){//TODOAuto-generatedmethodstubSystem.out.println(HelloWorld)。
6、点击上面的运行按钮，点击确认，可以看到代码运行结果。
如何编写高效java代码的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于如何写出优秀的java代码、如何编写高效java代码的信息别忘了在本站进行查找喔。
