阶段测试练习

import java.util.Scanner;
/**
 * @author Administrator
 *    从控制台输入字符串，将之全部替换成*号输出
 */
public class test1 {
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
        System.out.println("请输入英文字符：");
        String str = input.next();
        StringBuffer sb = new StringBuffer(str);
        for(int i = 0;i<sb.length();i++) {
            sb.replace(i, i+1, "*");
        }
        System.out.println("替换后的字符串为：
"+sb);
    }
}

import java.util.Scanner;

/**
 * @author Administrator
 *    截取一段字符串中的数字
 */
public class Test2 {
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
        System.out.println("请输入字符串：");
        String str = input.next();
        StringBuffer num = new StringBuffer();
        for(int i = 0;i<str.length();i++) {
            if(str.charAt(i)>=48 && str.charAt(i)<=57) {
                num.append(str.charAt(i));
            }
        }
        System.out.println("您的字符串包含以下数字：
"+num.toString());
    }
}

import java.util.Scanner;

/**
 * @author Administrator
 *    实现简易字符串压缩算法：一个长度最大为128的字符串，由字母a-z或者A-Z组成，
 *    将其中连续出现2次以上（含2次）的字母转换为字母和出现次数，
 */
public class Test3 {
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
        System.out.println("请输入一串出英文：");
        String str = input.next()+" ";
        StringBuffer sb = new StringBuffer();
        int num = 1;
        int i = 0;
        while(i<str.length()-1) {
            if(str.charAt(i) == str.charAt(i+1)) {
                num++;
                i++;
            }else if(num>1){
                sb.append(str.charAt(i));
                sb.append(num);
                num=1;
                i++;
            }else {
                sb.append(str.charAt(i));
                i++;
            }
        }
        System.out.println(sb);
    }
}

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

/**
 * @author Administrator
 *    文件创建及写入与复制
 */
public class Test4 {
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
        String src = "c:/javabigdata/a.txt";
        String dest = "c:/javabigdata/b.txt";
        createFile(src);
        System.out.println("请输入需要保存的内容：");
        String s = input.next();
        Out(src,s);
        
        copy(src,dest);
    }
    //新建目录及文件
    public static void createFile(String str) {
        File file = new File(str);
        try {
            file.createNewFile();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    //写入数据
    public static void Out(String str,String s) {
        BufferedWriter bw = null;
        FileWriter fw = null;
        try {
            fw = new FileWriter(str);
            bw = new BufferedWriter(fw);
            bw.write(s);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            try {
                bw.flush();
                bw.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    //复制文件
    public static void copy(String src,String dest) {
        BufferedReader in = null;
        BufferedWriter out = null;
        try {
            in = new BufferedReader(new FileReader(src));
            out = new BufferedWriter(new FileWriter(dest));
            
            String line = null;
            while ( (line = in.readLine()) != null ) {
                out.write(line);
                out.newLine();
            }
            out.flush();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            try {
                out.close();
                in.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
        }
    }
}

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author Administrator
 *    在控制台不断按时分秒打印的电子表
 */
public class Test5 {
    public static void main(String[] args) {
        SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
        while(true) {
            String time = format.format(new Date());
            System.out.println(time);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

/**
 * @author Administrator
 *    两个线程模拟两个人【一个实现runnable接口，一个继承thread类】，分别叫jack和rose，模拟两人在对话1000次
 */
public class Test6Dome {
    public static void main(String[] args) {
        Test6Syn syn = new Test6Syn();
        
        Test6Thread num = new Test6Thread(syn);
        Test6Runnable num1 = new Test6Runnable(syn);
        
        Thread thread = new Thread(num);
        Thread thread1 = new Thread(num1);
        
        thread.start();
        thread1.start();
    }
}


实现Runnable
public class Test6Runnable implements Runnable{
    private Test6Syn syn;
    
    public Test6Runnable(Test6Syn syn) {
        super();
        this.syn = syn;
    }
    
    public void run() {
        while(true) {
            for(int i = 0;i<500;i++) {
                syn.num1();
            }
            break;
        }
    }

}

继承Thread
public class Test6Thread extends Thread{
private Test6Syn syn;
    
    public Test6Thread(Test6Syn syn) {
        super();
        this.syn = syn;
    }
    
    public void run() {
        while(true) {
            for(int i = 0;i<500;i++) {
                syn.num();
            }
            break;
        }
    }
}

唤醒机制
public class Test6Syn {
    private boolean flag = false;
    public synchronized void num() {
        if(flag) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        System.out.println("jack说：我是查水表的！");
        flag = true;
        this.notify();
    }
    
    public synchronized void num1() {
        if(!flag) {
            try {
                wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        System.out.println("rose说：你是谁啊？");
        flag = false;
        this.notify();
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Test7Dome {
    static Scanner input = new Scanner(System.in);
    public static void main(String[] args) {
        
        List<Penguin> list = new ArrayList<>();
        list.add(new Penguin("欧欧", "Q仔"));
        list.add(new Penguin("亚亚", "Q妹"));
        list.add(new Penguin("菲菲", "Q妹"));
        list.add(new Penguin("美美", "Q妹"));
        
        System.out.println("共计有" + list.size() + "只企鹅。
分别是：");
        for (Penguin p : list) {
            System.out.println(p.getName() + "	" + p.getSex());
        }
        
        System.out.println("请输入要删除的企鹅名字：");
        String name = input.next();
        int dex =-1;
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).getName().equals(name)) {
                list.remove(i);
                dex = i;
            }
        }
        
        if(dex!=-1) {
            System.out.println("删除成功！");
        }else {
            System.out.println("不存在！");
        }
        
        System.out.println("删除之后还有" + list.size() + "只企鹅
" +"分别是：");
        for (Penguin p : list) {
            System.out.println(p.getName() + "	" + p.getSex());
        }
        
        System.out.println("请输入要查找的企鹅名字：");
        String name1 = input.next();
        int dex1 =-1;
        for (int i = 0; i < list.size(); i++) {
            if (list.get(i).getName().equals(name1)) {
                dex1 = i;
            }
        }
        
        if(dex1!=-1) {
            System.out.println("集合中包含" + name1 + "的信息");
        }else {
            System.out.println("集合中不包含" + name1 + "的信息");
        }
    }
}

import java.util.Scanner;

/**
 * @author Administrator
 *    会员注册
 */
public class Test8 {
    static Scanner input = new Scanner(System.in);
    static boolean flag = false;
    public static void main(String[] args) {
        System.out.println("***欢迎进入注册系统***");
        while(!flag) {
            System.out.println("请输入用户名：");
            String name = input.next();
            System.out.println("请输入密码：");
            String psw = input.next();
            System.out.println("请再次输入密码：");
            String psw1 = input.next();
            flag = isOk(name,psw,psw1);
        }
        
    }
    
    public static boolean isOk(String name,String psw,String psw1) {
        if(name.length()<3||psw.length()<6) {
            flag = false;
            System.out.println("用户名长度不嫩小于3，密码长度不能小于6！");
        }else if(!psw.equals(psw1)) {
            flag = false;
            System.out.println("两次输入的密码不相同！！");
        }else {
            flag = true;
            System.out.println("注册成功！");
        }
        return flag;
        
    }
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * @author Administrator
 *    服务器端
 */
public class Test9Sever {
    public static void main(String[] args) {
        try {
            ServerSocket serversocket = new ServerSocket(8888);
            Socket socket = serversocket.accept();
            InputStream is = socket.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String info;
            while((info = br.readLine())!=null) {
                System.out.println("客户端说："+info);
            }
            
            String reply = "欢迎！";
            OutputStream ot = socket.getOutputStream();
            ot.write(reply.getBytes());
            
            ot.close();
            br.close();
            is.close();
            socket.close();
            serversocket.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;

/**
 * @author Administrator
 *    客户端
 */
public class Test9Client {
    public static void main(String[] args) {
        try {
            Socket socket = new Socket("localhost",8888);
            String info = "用户名：Dean，密码：123456";
            OutputStream os = socket.getOutputStream();
            os.write(info.getBytes());
            
            socket.shutdownOutput();
            InputStream is = socket.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String info1;
            while((info1 = br.readLine())!=null) {
                System.out.println("服务器说："+info1);
            }
            
            br.close();
            is.close();
            os.close();
            socket.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author Administrator
 *    图片复制
 */
public class Test10 {
    public static void main(String[] args) {
        copy("a.png","b.png");
    }
    
    private static void copy(String src, String dest){
        BufferedInputStream in = null;
        BufferedOutputStream out = null;
        try {
            in = new BufferedInputStream(new FileInputStream(src));
            out = new BufferedOutputStream(new FileOutputStream(dest));
            byte[] buffer = new byte[1024];
            int len = -1;
            while ( (len = in.read(buffer)) != -1) {
                out.write(buffer, 0, len);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            try {
                in.close();
                out.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}