Create Collection using Java Driver - MongoDB

package com.mongo;

import java.net.UnknownHostException;

import org.bson.Document;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDBExample {
public static void main(String[] args) throws UnknownHostException {

createCollection();
}

public static void createCollection(){
User user = createUser();
Document doc = createDBObject(user);

MongoClient mongo = new MongoClient("localhost", 27017);
MongoDatabase db =  mongo.getDatabase("test");

MongoCollection<Document> col = db.getCollection("users");

//create user
col.insertOne(doc);
}

private static Document createDBObject(User user) {
Document docBuilder = new Document();

docBuilder.append("_id", user.getId());
docBuilder.append("name", user.getName());
docBuilder.append("role", user.getRole());
docBuilder.append("isEmployee", user.isEmployee());
return docBuilder;
}

private static User createUser() {
User u = new User();
u.setId(2);
u.setName("Raj");
u.setEmployee(true);
u.setRole("CEO");
return u;
}
}

package com.mongo;

public class User {

private int id;

private String name;

private String role;

private boolean isEmployee;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getRole() {

return role;

}

public void setRole(String role) {

this.role = role;

}

public boolean isEmployee() {

return isEmployee;

}

public void setEmployee(boolean isEmployee) {

this.isEmployee = isEmployee;

}

}

DESCRIBE Syntax Collection - MongoDB

Type the below query in editor / mongoshell

var col_list= db.emp.findOne();
for (var col in col_list) { print (col) ; }

output will give you name of columns in collection :

_id
name
salary