摘自http://topic.csdn.net/u/20080617/15/706679c5-e108-4ec0-801b-75728ad19fe6.html 1.一个饲养员给动物喂食物的例子体现JAVA中的面向对象思想,接口（抽象类）的用处 package com.softeem.demo;/** *@author leno *动物的接口 */interface Animal {    public void eat(Food food);}/** *@author leno *一种动物类:猫 */class Cat implements Animal {    public void eat(Food food) {        System.out.println("小猫吃" + food.getName());    }}/** *@author leno *一种动物类:狗 */class Dog implements Animal {    public void eat(Food food) {        System.out.println("小狗啃" + food.getName());    }}/** *@author leno *食物抽象类 */abstract class Food {    protected String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}/** *@author leno *一种食物类:鱼 */class Fish extends Food {    public Fish(String name) {        this.name = name;    }}/** *@author leno *一种食物类:骨头 */class Bone extends Food {    public Bone(String name) {        this.name = name;    }}/** *@author leno *饲养员类 * */class Feeder {    /**     *饲养员给某种动物喂某种食物     *@param animal     *@param food     */    public void feed(Animal animal, Food food) {        animal.eat(food);    }}/** *@author leno *测试饲养员给动物喂食物 */public class TestFeeder {    public static void main(String[] args) {        Feeder feeder = new Feeder();        Animal animal = new Dog();        Food food = new Bone("肉骨头");        feeder.feed(animal, food); //给狗喂肉骨头        animal = new Cat();        food = new Fish("鱼");        feeder.feed(animal, food); //给猫喂鱼    }} 2.做一个单子模式的类，只加载一次属性文件 package com.softeem.demo;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import java.util.Properties;/** * @authorleno 单子模式，保证在整个应用期间只加载一次配置属性文件 */public class Singleton {    private static Singleton instance;    private static final String CONFIG_FILE_PATH = "E:\\config.properties";    private Properties config;    private Singleton() {        config = new Properties();        InputStream is;        try {            is = new FileInputStream(CONFIG_FILE_PATH);            config.load(is);            is.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public static Singleton getInstance() {        if (instance == null) {            instance = new Singleton();        }        return instance;    }    public Properties getConfig() {        return config;    }    public void setConfig(Properties config) {        this.config = config;    }} 3.用JAVA中的多线程示例银行取款问题 package com.softeem.demo;/** *@author leno *账户类 *默认有余额，可以取款 */class Account {    private float balance = 1000;    public float getBalance() {        return balance;    }    public void setBalance(float balance) {        this.balance = balance;    }    /**     *取款的方法需要同步     *@param money     */    public synchronized void withdrawals(float money) {        if (balance >= money) {            System.out.println("被取走" + money + "元!");            try {                Thread.sleep(1000);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            balance -= money;        } else {            System.out.println("对不起,余额不足!");        }    }}/** *@author leno *银行卡 */class TestAccount1 extends Thread {    private Account account;    public TestAccount1(Account account) {        this.account = account;    }    @Override    public void run() {        account.withdrawals(800);        System.out.println("余额为:" + account.getBalance() + "元!");    }}/** *@authorleno *存折 */class TestAccount2 extends Thread {    private Account account;    public TestAccount2(Account account) {        this.account = account;    }    @Override    public void run() {        account.withdrawals(700);        System.out.println("余额为:" + account.getBalance() + "元!");    }}public class Test {    public static void main(String[] args) {        Account account = new Account();        TestAccount1 testAccount1 = new TestAccount1(account);        testAccount1.start();        TestAccount2 testAccount2 = new TestAccount2(account);        testAccount2.start();    }} 4.用JAVA中的多线程示例生产者和消费者问题 package com.softeem.demo;class Producer implements Runnable {    private SyncStack stack;    public Producer(SyncStack stack) {        this.stack = stack;    }    public void run() {        for (int i = 0; i < stack.getProducts().length; i++) {            String product = "产品" + i;            stack.push(product);            System.out.println("生产了: " + product);            try {                Thread.sleep(200);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}class Consumer implements Runnable {    private SyncStack stack;    public Consumer(SyncStack stack) {        this.stack = stack;    }    public void run() {        for (int i = 0; i < stack.getProducts().length; i++) {            String product = stack.pop();            System.out.println("消费了: " + product);            try {                Thread.sleep(1000);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}class SyncStack {    private String[] products = new String[10];    private int index;    public synchronized void push(String product) {        if (index == product.length()) {            try {                wait();            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        notify();        products[index] = product;        index++;    }    public synchronized String pop() {        if (index == 0) {            try {                wait();            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        notify();        index--;        String product = products[index];        return product;    }    public String[] getProducts() {        return products;    }}public class TestProducerConsumer {    public static void main(String[] args) {        SyncStack stack = new SyncStack();        Producer p = new Producer(stack);        Consumer c = new Consumer(stack);        new Thread(p).start();        new Thread(c).start();    }} 5.编程实现序列化的Student（sno,sname）对象在网络上的传输 package com.softeem.demo;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.Serializable;import java.net.ServerSocket;import java.net.Socket;class Student implements Serializable {    private int sno;    private String sname;    public Student(int sno, String sname) {        this.sno = sno;        this.sname = sname;    }    public int getSno() {        return sno;    }    public void setSno(int sno) {        this.sno = sno;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    @Override    public String toString() {        return "学号:" + sno + ";姓名:" + sname;    }}class MyClient extends Thread {    @Override    public void run() {        try {            Socket s = new Socket("localhost", 9999);            ObjectInputStream ois = new ObjectInputStream(s.getInputStream());            Student stu = (Student) ois.readObject();            String msg = "客户端程序收到服务器端程序传输过来的学生对象>> " + stu;            System.out.println(msg);            ois.close();            s.close();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (ClassNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}class MyServer extends Thread {    @Override    public void run() {        try {            ServerSocket ss = new ServerSocket(9999);            Socket s = ss.accept();            ObjectOutputStream ops = new ObjectOutputStream(s.getOutputStream());            Student stu = new Student(1, "赵本山");            ops.writeObject(stu);            ops.close();            s.close();            ss.close();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}public class TestTransfer {    public static void main(String[] args) {        new MyServer().start();        new MyClient().start();    }}

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