Getordefault

public class GetOrDefault {
    public static void main(String[] args) {
        EmployDO zhangsan = new EmployDO.Builder().name("张三").sex("男").position("职员").status("在职").age("20").build();
        EmployDO lisi = new EmployDO.Builder().name("李四").sex("男").position("职员").status("在职").age("24").build();
        EmployDO wangwu = new EmployDO.Builder().name("王五").sex("男").position("职员").status("离职").age("21").build();
        EmployDO xiaohua = new EmployDO.Builder().name("小花").sex("女").position("职员").status("离职").age("23").build();
        Map map = new HashMap<>();
        map.put("zhangsan", zhangsan);
        map.put("lisi", lisi);
        map.put("wangwu", wangwu);
        EmployDO lisi1 = map.getOrDefault("lisi", xiaohua);
        System.out.println(JSON.toJSONString(lisi1));// 因为map中存在key值"lisi",所以返回"lisi"对应的value 
        // {"age":"24","name":"李四","position":"职员","sex":"男","status":"在职"}
        
        EmployDO xiaohua1 = map.getOrDefault("lihua", xiaohua);
        System.out.println(JSON.toJSONString(xiaohua1));// 因为map中不存在key值"lihua",所以返回默认value--xiaohua
        // {"age":"23","name":"小花","position":"职员","sex":"女","status":"离职"}
    }
}