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java set object field equal another field upon instantation


java set object field equal another field upon instantation

By : user2173012
Date : October 22 2020, 08:10 AM
wish help you to fix your issue Generally, Java-JSON mapping libraries invoke the no arg constructor to unserialize a JSON object into a Java Object.
According to the libraries you use you could use a way to set the fields from the arg constructor.
code :
Foo foo = ... // unserialize from json
foo.setLocalTime(myUTCTime); 


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Java List.contains(Object with field value equal to x)

Java List.contains(Object with field value equal to x)


By : Shah Newaj
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Streams
If you are using Java 8, perhaps you could try something like this:
code :
public boolean containsName(final List<MyObject> list, final String name){
    return list.stream().filter(o -> o.getName().equals(name)).findFirst().isPresent();
}
public boolean containsName(final List<MyObject> list, final String name){
    return list.stream().map(MyObject::getName).filter(name::equals).findFirst().isPresent();
}
public void perform(final List<MyObject> list, final String name){
    list.stream().filter(o -> o.getName().equals(name)).forEach(
            o -> {
                //...
            }
    );
}
public boolean containsName(final List<MyObject> list, final String name){
    return list.stream().anyMatch(o -> o.getName().equals(name));
}
Java 8 get a field of object when another field is minimum from a list of objects

Java 8 get a field of object when another field is minimum from a list of objects


By : 鹰潭火车站酒店小姐
Date : March 29 2020, 07:55 AM
I hope this helps you . I have list of objects objList which has two fields age and id. age is long and id is String. I want to iterate over the list and get the id of object that has minimum age in the list. I can do it with a traditional for loop, but I am sure there would be a compact solution in java 8.
code :
objList.stream()
        .min(Comparator.comparingLong(MyObj::getAge))
        .orElseThrow(AssertionError::new)
        .getId()
mongodb, Updating a field in an object in array field equal to a document field

mongodb, Updating a field in an object in array field equal to a document field


By : ralfingo
Date : March 29 2020, 07:55 AM
Hope this helps let's say I have docs such as , Try this (v4.2):
code :
db.users.updateMany(
    {"comments.nickname":null},
    [
        {"$set": {"comments.nickname": "$nickname"}}
    ]
)
db.users.aggregate([
  {
    $match: {
      "comments.nickname": null
    }
  },
  {
    $addFields: {
      comments: {
        $map: {
          input: "$comments",
          in: {
            id: "$$this.id",
            nickname: {
              $cond: [
                "$$this.nickname",
                "$$this.nickname",
                "$nickname"
              ]
            }
          }
        }
      }
    }
  },
  {
    $out: "users"
  }
])
Set value of data frame new field equal to another field based on condition on a third field in R

Set value of data frame new field equal to another field based on condition on a third field in R


By : DisplayName=
Date : March 29 2020, 07:55 AM
like below fixes the issue If I want to add a field to a given data frame and setting it equal to an existing field in the same data frame based on a condition on a different (existing) field. , Using data.table it's quite easy
Gson Deserialize:Json Field Name Different from Java Object Field Name

Gson Deserialize:Json Field Name Different from Java Object Field Name


By : rui li
Date : March 29 2020, 07:55 AM
it helps some times One field in the json passed to me is different from the field name of the Java object that I want to deserialize this json into. Suppose I want to deserialize:
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