这个例子好似来自tij-4,(太久没更新博客了,不记得了)。
这个例子主要是用来说明,运行时能获取的被实现的接口,被继承的类的信息。
在实际开发中是一个蛮常用的手段,比如在框架中要检查某个类是否实现了某一接口。
package org.iteye.bbjava.runtimeinformation;
class Toy {
/**
* It's a contructor of Toy class,it could be used contructing an object of
* Toy at runtime.
* */
public Toy() {
// TODO Auto-generated constructor stub
}
public Toy(int i) {
}
}
interface HasBatteries {
}
interface Waterproof {
}
interface Shoots {
}
class FancyToy extends Toy implements HasBatteries, Waterproof, Shoots {
FancyToy() {
super(1);
}
}
public class ToyTest {
static void printInfo(Class cc) {
System.out.println("Class name: " + cc.getName() + " is interface?["
+ cc.isInterface() + "]");
System.out.println("Simple name: " + cc.getSimpleName());
System.out.println("Canonical name: " + cc.getCanonicalName());
}
public static void main(String[] args) {
Class c = null;
try {
c = Class.forName("org.iteye.bbjava.runtimeinformation.FancyToy");
} catch (Exception e) {
System.out.println("Can't find FancyToy");
System.exit(1);
}
printInfo(c);
for (Class face : c.getInterfaces()) {
printInfo(face);
Class up = c.getSuperclass();
Object obj = null;
try {
obj = up.newInstance();
} catch (InstantiationException e) {
System.out.println("Can't getInstance from up object");
System.exit(1);
} catch (IllegalAccessException e) {
System.out.println("Can't access");
System.exit(1);
}
printInfo(obj.getClass());
}
}
}
console info:
引用
Class name: org.iteye.bbjava.runtimeinformation.FancyToy is interface?[false]
Simple name: FancyToy
Canonical name: org.iteye.bbjava.runtimeinformation.FancyToy
Class name: org.iteye.bbjava.runtimeinformation.HasBatteries is interface?[true]
Simple name: HasBatteries
Canonical name: org.iteye.bbjava.runtimeinformation.HasBatteries
Class name: org.iteye.bbjava.runtimeinformation.Toy is interface?[false]
Simple name: Toy
Canonical name: org.iteye.bbjava.runtimeinformation.Toy
Class name: org.iteye.bbjava.runtimeinformation.Waterproof is interface?[true]
Simple name: Waterproof
Canonical name: org.iteye.bbjava.runtimeinformation.Waterproof
Class name: org.iteye.bbjava.runtimeinformation.Toy is interface?[false]
Simple name: Toy
Canonical name: org.iteye.bbjava.runtimeinformation.Toy
Class name: org.iteye.bbjava.runtimeinformation.Shoots is interface?[true]
Simple name: Shoots
Canonical name: org.iteye.bbjava.runtimeinformation.Shoots
Class name: org.iteye.bbjava.runtimeinformation.Toy is interface?[false]
Simple name: Toy
Canonical name: org.iteye.bbjava.runtimeinformation.Toy