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| 获得一类对象 |
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import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
Person p = new Person("A");
Animal a = new Animal("B");
Thing t = new Thing("C");
String text = "hello";
Integer number = 1000;
List<Object> list = new ArrayList<Object>();
list.add(p);
list.add(a);
list.add(t);
list.add(text);
list.add(number);
for (int i = 0; i < list.size(); i++) {
Object o = list.get(i);
if (o instanceof Person) {
System.out.println("My name is " + ((Person) o).getName());
} else if (o instanceof Animal) {
System.out.println("I live in " + ((Animal) o).getHabitat());
} else if (o instanceof Thing) {
System.out.println("My color is " + ((Thing) o).getColor());
} else if (o instanceof String) {
System.out.println("My text is " + o.toString());
} else if (o instanceof Integer) {
System.out.println("My value is " + ((Integer) o));
}
}
}
}
class Person {
private String name;
public Person(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
class Animal {
private String habitat;
public Animal(String habitat) {
this.habitat = habitat;
}
public String getHabitat() {
return habitat;
}
}
class Thing {
private String color;
public Thing(String color) {
this.color = color;
}
public String getColor() {
return color;
}
}
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