How to update an existing document in MongoDB collection using Java?

The update() method updates the values in the existing document.

Syntax

db.COLLECTION_NAME.update(SELECTIOIN_CRITERIA, UPDATED_DATA)

In Java, you can update a single document using the updateOne()method of the com.mongodb.client.MongoCollection interface. To this method, you need to pass the filter and values for the update.

Example

import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.Filters; import com.mongodb.client.model.Updates; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.bson.Document; import com.mongodb.MongoClient; public class UpdatingDocuments {    public static void main( String args[] ) {       // Creating a Mongo client       MongoClient mongo = new MongoClient( "localhost" , 27017 );       //Connecting to the database       MongoDatabase database = mongo.getDatabase("myDatabase");       //Creating a collection object       MongoCollection<Document>collection = database.getCollection("myCollection");       //Preparing documents       Document document1 = new Document("name", "Ram").append("age", 26).append("city", "Hyderabad");       Document document2 = new Document("name", "Robert").append("age", 27).append("city", "Vishakhapatnam");       Document document3 = new Document("name", "Rhim").append("age", 30).append("city", "Delhi");       //Inserting the created documents       List<Document> list = new ArrayList<Document>();       list.add(document1);       list.add(document2);       list.add(document3);       collection.insertMany(list);       //Updating a document       collection.updateOne(Filters.eq("name", "Robert"), Updates.set("city", "Delhi"));       System.out.println("Document update successfully...");       FindIterable<Document> iterDoc = collection.find();       Iterator it = iterDoc.iterator();       while (it.hasNext()) {          System.out.println(it.next());       }    } }

Output

Document update successfully... Document after update: Document{{_id=5e86dd21e9b25f3460b1abe0, name=Ram, age=26, city=Hyderabad}} Document{{_id=5e86dd21e9b25f3460b1abe1, name=Robert, age=27, city=Vishakhapatnam}} Document{{_id=5e86dd21e9b25f3460b1abe2, name=Rhim, age=30, city=Delhi}}