json list map 对象 转换成tostring Json的数据格式，jsontostring

json list map 对象 转换成tostring Json的数据格式，jsontostring

package 

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import 

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;

public class Dmeo {

    public static void main(String [] str){
        //数组
        ArrayList list = new ArrayList();
        list.add("11");
        list.add("22");
        System.out.println(list.toString());
        System.out.println(JSON.toJSONString(list));
        System.out.println("--------------");
        //集合
        HashMap<Object, Object> map = new HashMap<>();
        map.put("11","aa");
        map.put("22","bb");
        System.out.println(map.toString());
        System.out.println(JSON.toJSONString(map));
        System.out.println("--------------");
        //对象
        BaseEntity base = new BaseEntity();
        base.setId(1L);
        base.setDateCreated(new Date());
        base.setVersion(1);
        System.out.println(base.toString());
        System.out.println(JSON.toJSONString(base));
        System.out.println(JSON.toJSONString(base.toString()));
        System.out.println("--------------");
        //
        ArrayList list1 = new ArrayList();
        list1.add(base);
        list1.add(base);
        System.out.println(list1.toString());
        System.out.println(JSON.toJSONString(JSON.toJSONString(list1)));
        System.out.println(JSON.toJSONString(list1,SerializerFeature.DisableCircularReferenceDetect));
        System.out.println("--------------");
    }
}

[11, 22]
["11","22"]
--------------
{11=aa, 22=bb}
{"11":"aa","22":"bb"}
--------------
BaseEntity{id=1, remarks='null', recordStatus=null, version=1, dateCreated=Wed Dec 20 10:58:31 CST 2017, lastModified=null}
{"dateCreated":1513738711117,"id":1,"version":1}
"BaseEntity{id=1, remarks='null', recordStatus=null, version=1, dateCreated=Wed Dec 20 10:58:31 CST 2017, lastModified=null}"
--------------
[BaseEntity{id=1, remarks='null', recordStatus=null, version=1, dateCreated=Wed Dec 20 10:58:31 CST 2017, lastModified=null}, BaseEntity{id=1, remarks='null', recordStatus=null, version=1, dateCreated=Wed Dec 20 10:58:31 CST 2017, lastModified=null}]
"[{\"dateCreated\":1513738711117,\"id\":1,\"version\":1},{\"$ref\":\"$[0]\"}]"
[{"dateCreated":1513738711117,"id":1,"version":1},{"dateCreated":1513738711117,"id":1,"version":1}]
--------------