Can we use next() method with Observable

Question

Can we do the same functionality with Observable.

private messageSubject = new Observable<any>();
import { Injectable } from '@angular/core';
import { Observable, Subject } from 'rxjs';
@Injectable({ providedIn: 'root' })
export class MessageService {
private messageSubject = new Subject<any>();
sendMessage(dialog: {type: number, message: string}) {
this.messageSubject.next(dialog);
}
clearMessage() {
this.messageSubject.next();
}
getMessage(): Observable<any> {
return this.messageSubject.asObservable();
}
}