java-forced conversion type
1655 ワード
import java.util.Scanner;
// ; , ( , )
class Test {
public static void main(String[] args) {
System.out.println("hello world !!! "); // , , ,
method(new Cat());
method(new Dog());
}
public static void method (Animal a) {
a.eat();
}
}
class Animal {
public void eat() {
System.out.println(" Animal eat some foods !!! ");
}
}
class Cat extends Animal {
public void eat() {
System.out.println(" Cat eats fish");
}
public void catchMouse() {
System.out.println(" Catch Mouse");
}
}
class Dog extends Animal {
public void eat() {
System.out.println(" Dog eats meat");
}
public void lookHome() {
System.out.println(" look Home");
}
}
//
class Test {
public static void main(String[] args) {
Person p = new SuperMan();
System.out.println(p.name); // join
p.talk(); //superman talk with someone for one million
Superman t = (SuperMan)p; // ,
t.fly();
}
}
class Person {
String name = "John";
public void talk (){
System.out.println(" join talk with someone ... ");
}
}
class SuperMan extends Person {
String name = "SuperMan";
public void talk (){
System.out.println("superman talk with someone for one million ... ");
}
public void fly (){
System.out.println("talk with someone for one million ... ");
}
}