How to Update multiple documents in a MongoDB collection using Java?

Using the updateMany() method you can update all the documents of a collection.

Syntax

db.COLLECTION_NAME.update(<filter>, <update>)

In Java the com.mongodb.client.MongoCollection interface provides you a method with the same name. Using this method you can update multiple documents in a collection at once, 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 org.bson.conversions.Bson;
import com.mongodb.MongoClient;
public class UpdatingMultipleDocuments {
   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", "Delhi");
      Document document3 = new Document("name", "Rahim").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);
      System.out.println("List of the documents: ");
      FindIterable<Document> iterDoc = collection.find();
      Iterator it = iterDoc.iterator();
      while (it.hasNext()) {
         System.out.println(it.next());
      }
      //Updating multiple documents
      Bson filter = new Document("city", "Delhi");
      Bson newValue = new Document("city", "Vijayawada");
      Bson updateOperationDocument = new Document("$set", newValue);
      collection.updateMany(filter, updateOperationDocument);
      System.out.println("Document update successfully...");
      System.out.println("List of the documents after update");
      iterDoc = collection.find();
      it = iterDoc.iterator();
      while (it.hasNext()) {
         System.out.println(it.next());
      }
   }
}

Output

List of the documents:
Document{{_id=5e88a61fe7a0124a4fc51b2c, name=Ram, age=26, city=Hyderabad}}
Document{{_id=5e88a61fe7a0124a4fc51b2d, name=Robert, age=27, city=Delhi}}
Document{{_id=5e88a61fe7a0124a4fc51b2e, name=Rahim, age=30, city=Delhi}}
Document update successfully...
List of the documents after update
Document{{_id=5e88a61fe7a0124a4fc51b2c, name=Ram, age=26, city=Hyderabad}}
Document{{_id=5e88a61fe7a0124a4fc51b2d, name=Robert, age=27, city=Vijayawada}}
Document{{_id=5e88a61fe7a0124a4fc51b2e, name=Rahim, age=30, city=Vijayawada}}