public class AboutClass {
    public static void main(String[] args) {
        A a = new A();
        Class a1 = A.class;  //任何事物皆是对象，类A是Class类的对象
        Class a2 = a.getClass();  //a1,a2 表示了A类的类类型
        System.out.println("a1=a2是"+(a1==a2));
        try{
            Class a3 = Class.forName("com.project.reflect.A"); //全路径
            System.out.println("a1=a3是"+(a1==a3));
        }catch(Exception e){
            e.printStackTrace();
        }
        try {
            A a4 = (A) a1.newInstance(); //A必须有无参构造方法
            a4.print();
        } catch (Exception e) {
            
            e.printStackTrace();
        } 
        
    }
}

class A{
    public A(){
        
    };
    public void print(){
        System.out.println("this is A");
    }
}