java如何用反射获取类实例？

• 调用运行时类本身的.class属性

Class clazz=Person.class;

//创建class对应的运行时类Person对象

System.out.println(clazz);

Class clazz1=String.class;

System.out.println(clazz1);

• 运行时类的对象获取

Person p=new Person();

Class clazz2=p.getClass();

System.out.println(clazz2);

• 通过Class的静态方法获取

String className="test.Person";

Class clazz3=Class.forName(className);

System.out.println(clazz3);

• 通过类的加载器

ClassLoader classLoader=this.getClass().getClassLoader();

Class clazz4=classLoader.loadClass(className);

System.out.println(clazz4);

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public class Demo {private String key1 = "1";private String key2 = "2";public String getKey1() {return key1;}public void setKey1(String key1) {this.key1 = key1;}public String getKey2() {return key2;}public void setKey2(String key2) {this.key2 = key2;}public static void main(String[] args) throws Exception {//参数 “Demo” 是类的全名，如果在包结构下，要有完整包路径 比如： com.test.DemoClass<?> clazz = Class.forName("Demo");//“Demo”类必须有默认构造方法，否则会抛出异常Demo demo = (Demo) clazz.newInstance();System.out.println(demo.getKey1());System.out.println(demo.getKey2());}}