输出结果是：{}

import org.json.JSONObject;

public class JSONObjectSample {

public static void main(String[] args) {

createJsonByJavaBean();

}

private static void createJsonByJavaBean() {

PersonInfo info = new PersonInfo();

info.setName("John");

info.setSex("male");

info.setAge(22);

info.setStudent(true);

info.setHobbies(new String[] {"hiking", "swimming"});

JSONObject obj = new JSONObject(info);

System.out.println(obj);

}

class PersonInfo {

private String name;

private String sex;

private int age;

private boolean isStudent;

private String[] hobbies;

public void setName(String name) {

this.name = name;

}

public void setSex(String sex) {

this.sex = sex;

}

public void setAge(int age) {

this.age = age;

}

public void setStudent(boolean isStudent) {

this.isStudent = isStudent;

}

public void setHobbies(String[] hobbies) {

this.hobbies = hobbies;

}

}

}