入门必看的5个JAVA经典实例.doc

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1、入门必看的5个JAVA经典实例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packagecom.softeem.demo;/***@authorleno*动物的接口*/interfaceAnimal{   publicvoideat(Foodfood);}/***@authorleno*一种动物类:猫*/classCatimplementsAnimal{   publicvoideat(Foodfood){        System.out.println("小猫吃"+food.getName());   }}/***@auth

2、orleno*一种动物类:狗*/classDogimplementsAnimal{   publicvoideat(Foodfood){        System.out.println("小狗啃"+food.getName());   }}/***@authorleno*食物抽象类*/abstractclassFood{   protectedStringname;   publicStringgetName(){        returnname;   }   publicvoidsetName(Stringname){        this.name=na

3、me;   }}/***@authorleno*一种食物类:鱼*/classFishextendsFood{   publicFish(Stringname){        this.name=name;   }}/***@authorleno*一种食物类:骨头*/classBoneextendsFood{   publicBone(Stringname){        this.name=name;   }}/***@authorleno*饲养员类**/classFeeder{   /**     *饲养员给某种动物喂某种食物     *@paramanimal

4、     *@paramfood     */   publicvoidfeed(Animalanimal,Foodfood){        animal.eat(food);   }}/***@authorleno*测试饲养员给动物喂食物*/publicclassTestFeeder{   publicstaticvoidmain(String[]args){        Feederfeeder=newFeeder();        Animalanimal=newDog();        Foodfood=newBone("肉骨头");        f

5、eeder.feed(animal,food);//给狗喂肉骨头        animal=newCat();        food=newFish("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packagecom.softeem.demo;importjava.io.FileInputStream;importjava.io.FileNotFoundException;importjava.io.IOException;importjava.io.InputStrea

6、m;importjava.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*/publicclassSingleton{   privatestaticSingletoninstance;   privatestaticfinalStringCONFIG_FILE_PATH="E:\config.properties";   privatePropertiesconfig;   privateSingleton(){        config=newProperties();        Input

7、Streamis;        try{            is=newFileInputStream(CONFIG_FILE_PATH);            config.load(is);            is.close();        }catch(FileNotFoundExceptione){            //TODOAuto-generatedcatchblock            e.printStackTrace();        }catch(IOExceptione){