package HspLearningPoly.poly01.poly03;
public class DynamicBinding {
public static void main(String[] args) {
A a = new B();
System.out.println(a.sum());
System.out.println(a.sum1());
}
}
class A{
public int i =10;
public int sum() {
return getI()+10;
}
public int sum1(){
return i+10;
}
public int getI(){
return i;
}
}
class B extends A {
public int i=20;
public int sum(){
return i+20;
}
public int getI(){
return i;
}
public int sum1(){
return i+10;
}
}
java的动态绑定机制
1.当调用对象方法的时候,该方法会和该对象的内
存地址/运行类型绑定
2.当调用对象属性时,没有动态绑定机制,哪里声
明,那里使用
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