java举例体会反射的动态性

import java.lang.reflect.Constructor;
import java.util.Random;

public class ReflectionTest {
    public static void main(String[] args) throws Exception {
        ClassLoaderTest clt = new ClassLoaderTest();
        
        // 随机创建空参的运行时类对象
        for (int i = 0; i < 10; i++) {
            int num = new Random().nextInt(3);// 0,1,2
            String classPath = "";
            switch (num) {
            case 0:
                classPath = "com.lxh.clazz.Student";
                break;
            case 1:
                classPath = "java.util.Date";
                break;
            case 2:
                classPath = "java.lang.Object";
                break;
            }
            Object instance = clt.getInstance(classPath);
            System.out.println(instance);
        }
    }
    /*
     * 创建一个指定类的对象
     * classPath:指定类的全类名
     */
    public Object getInstance(String classPath) throws Exception {
        Class clazz = Class.forName(classPath);
        Constructor cons = clazz.getDeclaredConstructor();
        return cons.newInstance();
    }
}