一句JAVA语法，解释一下

Question

MapControll.getInstance().success().add("data",student).getMap();
想问下这句话什么意思，涉及到的语法知识最好帮我解释下，感谢！

Answer 1

import java.util.HashMap;
import java.util.Map;


public class MapControll extends HashMap {
    private static final String STATUS_OK = "isOk";
    private static final String STATUS_FAIL = "isFail";

    public MapControll() {}

    public static MapControll getInstance() {
        return new MapControll();
    }

    public MapControll success() {
        return this.setSucess();
    }

    public MapControll setSucess() {
        super.put(STATUS_OK, Boolean.TRUE);
        return this;
    }

    public MapControll add(Object key, Object value) {
        super.put(key, value);
        return this;
    }

    public Map getMap() {
        return this;
    }

    public static void main(String[] args) {
        System.err.println("：" + MapControll.getInstance().success().add("data", "data").getMap());

    }
}