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/**
用闭包来模拟面向对象的多态特性。
用Cow()函数和Sheep()函数返回的Mammal对象,其表现会不同。
这种多态不是用类的继承实现的,但效果是一样的。
*/
class Mammal{
function void() speak;
function int() getWeight;
function void(int) setWeight;
void foo(){
//在内部的方法中也可以调用这些函数型变量,与普通方法没有任何区别。
println("in foo");
setWeight(23);
speak();
}
}
//返回一个Mammal对象,其特征是
Mammal Cow(){
void speak(){
println("moo~~ moo~~");
}
int weight = 100;
int getWeight(){
return weight;
}
void setWeight(int w){
weight = w;
}
Mammal m = Mammal();
m.speak = speak;
m.getWeight = getWeight;
m.setWeight = setWeight;
return m;
}
Mammal Sheep(){
void speak(){
println("mee~~ mee~~");
}
int weight = 20;
int getWeight(){
return weight;
}
void setWeight(int w){
weight = w;
}
Mammal m = Mammal();
m.speak = speak;
m.getWeight = getWeight;
m.setWeight = setWeight;
return m;
}
Mammal m1 = Cow();
m1.speak();
println("weight of mammal1 : " + m1.getWeight());
m1.setWeight(101);
println("new weight of mammal1 : " + m1.getWeight());
println();
Mammal m2 = Sheep();
m2.speak();
println("weight of mammal2 : " + m2.getWeight());
m2.setWeight(21);
println("new weight of mammal2 : " + m2.getWeight());
println();
m2.foo();
println("new weight of mammal2 : " + m2.getWeight());
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