在 Lambda 表达式中处理 Null 值

问：

我正在尝试迭代使用 lambda 表达式，在迭代时，我必须使用字段 setter 方法在一个 POJO 中设置值。当 of 中有值时，问题就来了（特别是应该处理 map 字段）。我尝试了很多事情来处理.ListMapnullListMapnullNullPointerException

Employee employee = new Employee();

employee.setEmployeeName(result.getOrDefault("employeeName", "").toString());

employee.setEmployeeName(!StringUtils.isEmpty(result.get("employeeName").toString()) ? result.get("employeeName").toString() : " "); 
// when i am using this solution it is not giving null pointer exception 
// but if the value is null then it is returning "null" value it means 
// null as a string which shouldn't be the expected output. 

employee.setEmployeeName(String.valueOf(result.get("employeeName").equals("null") ? "" : result.get("employeeName")));

List<Map<String,Object>> r1 = new ArrayList<Map<String,Object>>();
    response.forEach(result -> { 
        employee.setEmployeeName(result.getOrDefault("employeeName", "").toString());

    })