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class Tiger() {
public void eat() {
System.out.println("I'm eating, YamiYami!");
}
public void eat(String food) {
System.out.println("I'm eating " + food + ", YamiYami!");
}
}
class Animal {
public void eat() {
System.out.println("Animal eating...");
}
}
class Tiger extends Animal {
public void eat() {
System.out.println("Tiger eating...");
}
}
例:
public class Address {
private String name;
public Address(String name){
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
定义基类(抽象类):
public abstract class Vehicle {
abstract void go(Address address);
}
Car对于基类的实现:
public class Car extends Vehicle{
@Override
public void go(Address address){
System.out.println("Car to " + address.getName());
}
}
Plane对于基类的实现:
public class Plane extends Vehicle{
@Override
void go(Address address) {
System.out.println("Plane to " + address.getName());
}
}
Driver中多态:
public void drive(Vehicle v){ ///多态,父类引用指向子类对象,实际传过来的是抽象类Vehicle的子类,或者实现类,然后编译器会根据具体实现类,来找实现方法。
v.go(new Address("杭州(abstract)")); ///此方法在具体的实现中被重写
}
Test:
public static void main(String[] args) {
Driver d = new Driver();
d.drive(new Plane()); //实际是Plane对象,则编译器就会找到Plane中,对go的实现
d.drive(new Car()); //实际是Car对象,则编译器就会找到Plane中,对go的实现
}
输出结果:
Plane to 杭州(abstract)
Car to 杭州(abstract)