java映射

虛擬機通過得到類的字節碼文件，從而創建對象。在java代碼中可用Class類中的方法進行實現，

package javase;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class ReflextDemo {
    
    public static void method2() throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        
        String name = "test.Person";//把類名的路徑存到字符串
        Class clazz = Class.forName(name);//通過路徑拿到字節碼文件，創建對象
        Constructor<Person> con = clazz.getConstructor(String.class,int.class);//獲取構造器
        Object obj = con.newInstance("小強",10);//創建實例
        
    }

    public static void method1() throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        
        String name = "test.Person";//把類名的路徑存到字符串
        Class clazz = Class.forName(name);//通過路徑拿到字節碼文件，創建對象
        Object obj = clazz.newInstance();//創建實例
        
    }
    
    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

        method2();
        
    }

}