在线课程代码

应用背景本节提供在使用列表结构和数据的实践操作集和树的抽象。该应用程序是表示数据的方法，作为序列的一个和零关键技术频率值--------- -----1 52 73 104 155 206 45创建哈夫曼树是简单的。按频率排序此列表把这两者的最低元素变成叶子，创建一个父节点用一个频率，这是两个较低的元素的频率总和：12：*/ 5:1 7:2这2个元素从列表中移除，新的父节点，与频率12，被插入到列表中的频率。所以现在按频率排序，是：10:312：*15:420:545:6然后再重复循环，将两者结合起来。这在：22：*/ 12：* 3/ 5:1 7:2现在的列表：15:420:522：*45:6你重复，直到只有一个元素在列表中留下。35：*/ 15:4 20:522：*35：*45:657：*___ / ___/ 22：* 35：*/ 12：3×15:4 20:5/ 5:1 7:245:657：*102：*__________________ / __/ 57：* 45:6___ / ___/ 22：* 35：*/ 12：3×15:4 20:5/ 5:1 7:2现在这个列表只包含一个元素，其中包含102个：*，你是。

JAVA专业术语集合，包含Java中遇到的大部分英文解释，可以很好的对Java中遇到的问题解决。(JAVA jargon collection)

毕业设计时的作品。。JAVA版的手机游戏,游戏名:海底探险(Graduate design work. . JAVA version of the mobile gaming, game name: Harbor Adventure)

说明：  springcloud 微服务架构，初学者可以通过此书快速理解微服务。(Microservice architecture, beginners can quickly understand microservices through this book.)

能实现导航，路线规划，可增加途径点后在进行导航，也可直接导航(To achieve navigation)

Tests for <code>CertificateFactorySpi</code> class constructors and methods for Andriod.

核心代码：package com.Test;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.app.Activity;import android.view.Menu;import android.widget.Button;import android.view.View;import android.view.View.OnClickListener;import java.io.BufferedInputStream;import java.io.InputStream;import java.io.OutputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.io.InputStreamReader;import java.io.BufferedReader;import java.io.PrintWriter;import java.io.Reader;import java.net.Socket;import java.net.ServerSocket;import java.net.UnknownHostException;import android.view.TextureView;import android.widget.EditText;import java.lang.String;import java.lang.Thread;public class MainActivity extends Activity implements OnClickListener{ private Button m_btn; private Button m_sendbtn; private ServerSocket mySerSocket; private Socket clientSocket; private EditText m_edit; private String line; boolean conn = true; private Socket accSocket; private static final String Host = "10.0.2.2"; private static final int Port = 12000; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); m_btn = (Button)findViewById(R.id.button1); m_sendbtn = (Button)findViewById(R.id.button2); m_edit = (EditText)findViewById(R.id.editText1); //m_btn.setOnClickListener(this); m_btn.setOnClickListener(new ReceiverListener()); m_sendbtn.setOnClickListener(this); //Socket clientSocket = new Socket(Host, Port); } class ReceiverListener implements OnClickListener { private ReceiveThread mReceiveThread = null; private boolean stop = true; private Handler mHandler = null; public void onClick(View v) { try { if(clientSocket == null) { clientSocket = new Socket(Host, Port); } // InputStream myInputStream = clientSocket.getInputStream();// // //BufferedReader in = new BufferedReader(new InputStreamReader(myInputStream));//// byte [] buffer = new byte[myInputStream.available()]; //int temp = 0; //String strMsg = in.readLine(); // myInputStream.read(buffer);// // // String strMsg = new String(buffer);// // m_edit.setText(strMsg);// while ((temp = myInputStream.read(buffer)) != -1)// {// m_edit.setText(new String(buffer, 0, temp));//// } mReceiveThread = new ReceiveThread(clientSocket); stop = false; mReceiveThread.start(); } catch (IOException e) { e.printStackTrace(); } //消息处理 mHandler = new Handler() { public void handleMessage(Message msg) { m_edit.setText((msg.obj).toString()); } }; } private class ReceiveThread extends Thread { private InputStream inStream = null; private byte[] buf; private String str = null; ReceiveThread(Socket s) { try { this.inStream = s.getInputStream(); } catch(IOException e) { e.printStackTrace(); } } public void run() { while(!stop) { this.buf = new byte[512]; try { this.inStream.read(this.buf); } catch(IOException e) { e.printStackTrace(); } try { this.str = new String(this.buf, "GB2312").trim(); } catch(UnsupportedEncodingException e) { e.printStackTrace(); } Message msg = new Message(); msg.obj = this.str; mHandler.sendMessage(msg); } } } } public void onClick(View v) {// if (v.getId() == R.id.button1)// {// new Thread()// {// public void run()// {// try // {// if(clientSocket == null)// {// clientSocket = new Socket(Host, Port);// } // InputStream myInputStream = clientSocket.getInputStream();// // BufferedReader in = new BufferedReader(new InputStreamReader(myInputStream));//// byte [] buffer = new byte[1024 * 4];//// int temp = 0;// // String strMsg = in.readLine();// // //myInputStream.read(buffer);// // //String strMsg = new String(buffer);// // m_edit.setText(strMsg);////// while ((temp = myInputStream.read(buffer)) != -1)//// {//// m_edit.setText(new String(buffer, 0, temp));//////// }// // }// catch (IOException e)// {// e.printStackTrace();// }// }// }.start();// // } if(v.getId() == R.id.button2) { new Thread() { public void run() { try { if(clientSocket == null) { clientSocket = new Socket(Host, Port); } //inputStream clientInputStream = clientSocket. String msg = "RESET-SHOW"; //InputStream clientInputStream = clientSocket.getInputStream(); //BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); //BufferedReader br = new BufferedReader(); //line = br.readLine(); OutputStream clientOutputStream = clientSocket.getOutputStream(); byte buffer[]=msg.getBytes(); clientOutputStream.write(buffer); clientOutputStream.flush(); //int temp = 0; // PrintWriter out = new PrintWriter(clientOutputStream);// // out.println("Serer Message: " msg); } catch(IOException e) { e.printStackTrace(); } } }.start(); } }private Reader InputStreamReader() { // TODO Auto-generated method stub return null; }// private Handler handler = new Handler()// {// public void handleMessage(Message msg)// {// super.handleMessage(msg);// //处理UI// m_edit.setText("Finish");// Log.i("PDA", "Finish");// // }// }; @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }}

说明：  用mvc写book系统，用数据库建立表格并用domel对数据库进行增删改查(Mvc book written by the system, using the database to create tables and use domel additions and deletions to the database search)

该程序可以使 UTF 8 文件阅读和写作。 程序使用的扫描仪类用于读取该文件。 UTF 8 文本启用了文件，阅读和写作非常有用的应用程序的不同的语言和文字编辑的文件并不是哪个进程 UTF 8。 程序找到 n 克所有不同的语言文字的文件

用Java做的一个简单计算器 有加减乘除等基本运算，可以实现运算优先级的判断，可以实现带括号的运算。 简单实用200行哈~Java初学者，大神们见谅~