【Java】FastJson反序列化默认值（包装类）

import com.alibaba.fastjson.JSON;
import lombok.Data;

@Data
class a {
    private int z;
    private long x;
    private double c;
}

@Data
class b {
    private Integer z;
    private Long x;
    private Double c;
}
public class JavalongLong {

    public static void main(String[] args) {

        String xStr = "{x:1}";
        String yStr = "{y:1}";
        String zStr = "{z:1}";

        System.out.println("========= 测试包装类反序列化默认值 =========");

        System.out.println("========= test long =========");
        System.out.println(JSON.parseObject(xStr, a.class));
        System.out.println(JSON.parseObject(yStr, a.class));
        System.out.println(JSON.parseObject(zStr, a.class));

        System.out.println("========= test long =========");
        System.out.println(JSON.parseObject(xStr, b.class));
        System.out.println(JSON.parseObject(yStr, b.class));
        System.out.println(JSON.parseObject(zStr, b.class));
        /*
        * ========= 测试包装类反序列化默认值 =========
          ========= test long =========
          a(z=0, x=1, c=0.0)
          a(z=0, x=0, c=0.0)
          a(z=1, x=0, c=0.0)
          ========= test long =========
          b(z=null, x=1, c=null)
          b(z=null, x=null, c=null)
          b(z=1, x=null, c=null)
        * */

    }
}

可以看出，使用fastJson反序列化时，包装类的默认值是null；而非包装类是0。