Java to MongoDB and, in, or frequently use operations

Dbcollection Dbcon = null;

DBObject query = new basicdbobject ();

Basicdblist values = new basicdblist ();

//or How to use --->> Check Salary salary<3000 or salary>10000

Values.add (new basicdbobject ("Salary", new basicdbobject ("$GT", 10000));

Values.add (new basicdbobject ("Salary", new basicdbobject ("$lt", 3000));

Query.put ("$or", values);

Dbcursor dbcursor = Dbcon. Find (query);

//end///

// Enquiry salary>1000 or age<22

Values.add (new basicdbobject ("Salary", new basicdbobject ("$GT", 10000));

Values.add (new Basicdbobject ("Age", new basicdbobject ("$lte", 22));

Query.put ("$or", values);

Dbcursor DbCursor2 = dbcon.find (query);

//end///

// in How to use --->> Enquiry salary in [+]

Values.add (3000);

Values.add (10000);

Query.put ("salary", new basicdbobject ("$in", values));

Dbcursor DbCursor3 = dbcon.find (query);

//and How to use --->> salary>10000 and age<22

Query.put ("salary", new basicdbobject ("$GT", 10000));

Query.put ("Age", new basicdbobject ("$lt", 22));

       dbcursor  dbCursor4  = dbcon.find (query);