设计模式

继承设计模式

//公司类
package edu.chinasoft.spring01;

public class Company extends XiaoMing {
    private XiaoWu  xiaoWu=new XiaoWu();
    @Override
    public void yaoZhang() {
        xiaoWu.before();
        super.yaoZhang();
        xiaoWu.after();
    }
}


//小明类
package edu.chinasoft.spring01;

public class XiaoMing {
    public void yaoZhang(){
        System.out.println("还我100元！");
    }
}

//小武类
package edu.chinasoft.spring01;

public class XiaoWu {
    public void before(){
        System.out.println("恐吓一下！");
    }
    public void after(){
        System.out.println("警告不要报警！");
    }
}

装饰设计模式

//公司类
package edu.chinasoft.spring02;


public class Company {
    private XiaoMing xiaoMing;
    private XiaoWu xiaoWu=new XiaoWu();


    public Company() {
    }
    //以构造函数参数 的形式将小明传进来
    public Company(XiaoMing xiaoMing) {
        this.xiaoMing = xiaoMing;
    }

    public void yaoZhang() {
        xiaoWu.before();
        this.xiaoMing.yaoZhang();
        xiaoWu.after();
    }
}



//小明类
package edu.chinasoft.spring02;

public class XiaoMing {
    public void yaoZhang() {
        System.out.println("还我100元！");
    }
}


//小武类
package edu.chinasoft.spring02;

public class XiaoWu {
    public void before(){
        System.out.println("恐吓一下！");
    }
    public void after(){
        System.out.println("警告不要报警！");
    }
}

静态代理设计模式

//接口要账
package edu.chinasoft.spring03;

public interface YaoZhang {
    void yaoZhang();
}



//公司类
package edu.chinasoft.spring03;


public class Company implements YaoZhang{
    private XiaoMing xiaoMing;
    private XiaoWu xiaoWu=new XiaoWu();


    public Company() {
    }

    public Company(XiaoMing xiaoMing) {
        this.xiaoMing = xiaoMing;
    }

    @Override
    public void yaoZhang() {
        xiaoWu.before();
        this.xiaoMing.yaoZhang();
        xiaoWu.after();
    }
}


//小明类
package edu.chinasoft.spring03;

public class XiaoMing implements YaoZhang {
    @Override
    public void yaoZhang() {
        System.out.println("还我100元！");
    }
}



//小武类
package edu.chinasoft.spring03;

public class XiaoWu {
    public void before(){
        System.out.println("恐吓一下！");
    }
    public void after(){
        System.out.println("警告不要报警！");
    }
}

动态代理设计模式

//要账接口
package edu.chinasoft.spring04;

public interface YaoZhang {
    void yaoZhang();
}



//公司工厂类  用来创建要账公司
package edu.chinasoft.spring04;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

//创建要账公司  创建关于 target代理类
public class CompanyFactory implements InvocationHandler {
    private  YaoZhang  yaoZhang;           //target
    private  XiaoWu xiaoWu=new XiaoWu();

    public CompanyFactory(YaoZhang yaoZhang) {
        this.yaoZhang = yaoZhang;
    }
    //通过j2se里的常用类 Proxy创建target的代理类
    public YaoZhang  createCompany(){
        //创建关于该对象yaoZhang的代理类
        YaoZhang o = (YaoZhang)Proxy.newProxyInstance(yaoZhang.getClass().getClassLoader(), yaoZhang.getClass().getInterfaces(), this);
        return  o;
    }

    //设计代理类里的功能
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        this.xiaoWu.before();
        Object result = method.invoke(this.yaoZhang, args);    //执行target类里任何方法
        this.xiaoWu.after();
        return result;
    }
}




//小明类
package edu.chinasoft.spring04;

public class XiaoMing implements YaoZhang {
    @Override
    public void yaoZhang() {
        System.out.println("还我100元！");
    }
}



//小武类
package edu.chinasoft.spring04;

public class XiaoWu {
    public void before(){
        System.out.println("恐吓一下！");
    }
    public void after(){
        System.out.println("警告不要报警！");
    }
}

单例设计模式

//People01类
package edu.chinasoft.spring02;

import org.apache.log4j.Logger;

public class People01 {
    private static People01 install = new People01();
    private  Logger logger = Logger.getLogger(People01.class);
    private People01() {
        logger.debug("people01里的私有构造函数执行 ……");
    }

    public static People01 getInstatll() {
        System.out.println("people01里的getInstall方法执行……");
        return install;
    }

}


//People02类
package edu.chinasoft.spring02;

public class People02 {
    private static People02 install = null;

    private People02() {
        super();
        // TODO Auto-generated constructor stub
    }

    public static  synchronized People02 getInstatll() {
        if (install == null) {
            install = new People02();
        }

        return install;
    }
}

工厂设计模式

//水果工厂类
package edu.chinasoft.spring03;

import org.apache.log4j.Logger;

public class FruitsFactory {
    private Logger logger = Logger.getLogger(FruitsFactory.class);
    public Pear  createPear() {
        logger.debug("类FruitsFactory里的方法createPear执行……");
        return new Pear();
    }
    
    public Apple  createApple() {
        return new Apple();
    }

}



//苹果
package edu.chinasoft.spring03;

public class Apple {

    @Override
    public String toString() {
        return "我是苹果!";
    }
    
    

}


//梨
package edu.chinasoft.spring03;

public class Pear {

    @Override
    public String toString() {
        return "我是梨!";
    }

}