进一步有进一步惊喜

public class HelloWorld {
    private String name;

    public void setName(String name) {
        this.name = name;
    }
    public void sayName(){
        System.out.println("name="+name);
    }
}

public class Main {
    public static void main(String[] args){
        try {
            // 第一种实例化
            HelloWorld h1 = HelloWorld.class.newInstance();
            h1.setName("h1");
            h1.sayName();
            // 使用类加载器实例化
            String name = "com.longquanxiao.instance.HelloWorld";
            Class hClass = Class.forName(name);
            HelloWorld h2 =(HelloWorld) hClass.newInstance();
            h2.setName("h2");
            h2.sayName();
            // 传统的new实例化
            HelloWorld h3 = new HelloWorld();
            h3.setName("h3");
            h3.sayName();

        }catch (Exception e){
            e.printStackTrace();
        }
    }
}