想要使用JSONUtil.parse将java对象转为json格式，但是一直为空，代码如下

public class MyTest {
    public static void main(String[] args) {

        Test3<String> test3 = new Test3<>("2","hhhhhhaaa");

        System.out.println(JSONUtil.parse(test3));
    }
}

class Test3<T>{
    String name;
    T msg;

    Test3(String name,T msg){
        this.name = name;
        this.msg = msg;
    }
}

后来经过指点，需要加入set和get方法才能转为json格式

public class MyTest {
    public static void main(String[] args) {

        Test3<String> test3 = new Test3<>("2","hhhhhhaaa");

        System.out.println(JSONUtil.parse(test3));
    }
}

class Test3<T>{
    String name;
    T msg;

    Test3(String name,T msg){
        this.name = name;
        this.msg = msg;
    }

    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return this.name;
    }

    public void setMsg(T msg){
        this.msg = msg;
    }

    public T getMsg(){
        return this.msg;
    }


}