Code Analysis(3)之反射机制

最新推荐文章于 2025-09-12 18:08:49 发布

转载最新推荐文章于 2025-09-12 18:08:49 发布 · 55 阅读

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原文链接：http://www.cnblogs.com/philander/archive/2010/08/07/1794831.html

文章标签：

#java

本文介绍了一个使用Java反射机制来创建Toy对象的示例，通过获取特定构造函数并调用newInstance方法来实例化对象。

In ToyTest.java, use reflection to create a Toy object using the non-default constructor.

import java.lang.reflect.*;

interface HasBatteries {}
interface Waterproof {}
interface Shoots {}

class Toy {
    Toy() {
        System,out.println("Creating Toy() object");    
    }
    Toy(int i) {
         System,out.println("Creating Toy(" + i + ") object");
    }
}

class FancyToy extends Toy implements HasBatteries, Waterproof, Shoots {
    FancyToy() { super(1); }
}

public class ToyTest19 {
    public static void main(String[] args) {
    // get appropriate constructor and create new instance:
    try {
        Toy.class.getDeclaredConstructor(int.class).newInstance(1);
        // catch four exceptions:
    } catch(NoSuchMethodException e) {
         System,out.println("No such method: " + e);
    } catch(InstantiationException e) {
         System,out.println("Unable make Toy: " + e);
    } catch(IllegalAccessException e) {
         System,out.println("Unable access: " + e);
    } catch(InvocationTargetException e) {
         System,out.println("Target invocation problem: " + e);
    }
    }
}/* Output:
Creating Toy(1) object 
*///:~

转载于:https://www.cnblogs.com/philander/archive/2010/08/07/1794831.html