java 完全解耦和弱耦合

//完全解耦是尽最大程度降低类与类之间的耦合度，使程序具有很好的扩展性，便于修改

//耦合：类和类、模块和模块之间存在依赖关系，如果修改了某个实现就需要改一堆已经编写好的代码，这就是代码耦合度较高。/分层、注入、面向接口编程都是解耦的方式。
完全解耦:

package xiancheng;

public class House implements Runnable{

int waterAmount;

public void setWater(int w){
waterAmount=w;

}

public void run(){
while(true){
String name=Thread.currentThread().getName();
if(name.equals("狗")){//完全解耦和弱耦合
System.out.println(name+"喝水");
waterAmount=waterAmount-2;
}
else if(name.equals("猫")){
System.out.println(name+"喝水");
waterAmount=waterAmount-1;
}
System.out.println("剩"+waterAmount);
try{
Thread.sleep(2000);
}
catch(InterruptedException e){
}
if(waterAmount<=0){
return ;
}
}

}

}

public class Example12_3 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

    House house=new House();

    Thread dog,cat;

    dog=new Thread(house);

    cat=new Thread(house);

    dog.setName("狗");

    cat.setName("猫");

    house.setWater(10);

    dog.start();

    cat.start();
}

}

package xiancheng;

public class House implements Runnable{

int waterAmount;

public void setWater(int w){
waterAmount=w;

}

public void run(){
while(true){
String name=Thread.currentThread().getName();
if(name.equals("狗")){//完全解耦和弱耦合
System.out.println(name+"喝水");
waterAmount=waterAmount-2;
}
else if(name.equals("猫")){
System.out.println(name+"喝水");
waterAmount=waterAmount-1;
}
System.out.println("剩"+waterAmount);
try{
Thread.sleep(2000);
}
catch(InterruptedException e){
}
if(waterAmount<=0){
return ;
}
}

}

}

耦合:

package xiancheng2;

public class Example12_4 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Home home=new Home();
    home.setWater(10);
    home.dog.start();
    home.cat.start();
}

}

package xiancheng2;

public class Home implements Runnable{
int waterAmount;
Thread dog,cat;

Home(){
dog=new Thread(this);
cat=new Thread(this);

}

public void setWater(int w){
waterAmount=w;

}

public void run(){
while(true){
Thread t=Thread.currentThread();
if(t==dog){
System.out.println("狗喝水");
waterAmount=waterAmount-2;
}
else if(t==cat){
System.out.println("猫喝水");
waterAmount=waterAmount-1;
}
System.out.println("剩"+waterAmount);
try{
Thread.sleep(2000);
}catch(InterruptedException e){}
if(waterAmount<=0){return ;}
}
}

}