coursera ibm what is data science答案
1. Oracle is an RDBMS product with DDL and DML from a company called Oracle Inc.
2. Difference between 8i and 9i is given in the Oracle site
3. Question not available
4. Something
5. oops is Object Oriented Programming
6.what is single inheritance.
ans:one class is inherited by only other one class
7.what is multiple inheritance.
ans:One class inheriting more than one class at a time
8.can java support multiple inheritance.
ans:No
9.what is interface.
ans:Interface has only method declarations but no deft
10.what is difference between abstract class and interface.
ans:In abstract class some methods may contain definition,but in
interface every method should be abstract
11.how to u prove that abs trace class cannot instantiate directly.
ans:As they don’t have constructor they cant be instantiated
12.what is difference between string and string-buffer.ans:Strings are immutable where as string buffer can be modified
13.what is immutable
ans:Which cant be changed
14.how to write a program using sort program.
15 how to write a program using unsorted program.
ans: Both can be done using java script
This is for Sort
function Select Text Sort(obj) { // sort by text
var N=obj.options.length;
for (var i=0;i<N-1;i++) {
for (var j=i+1;j<N;j++) {
if ( obj.options[i].text > obj.options[j].text ) {
var i1= (obj.options[i].selected == true ) ? true : false
var j1= (obj.options[j].selected == true ) ? true : false
var q1 = obj.options[j].text;
var q2 = obj.options[j].value;
obj.options[j].text = obj.options[i].text;
obj.options[j].value = obj.options[i].value;
obj.options[i].text = q1;
obj.options[i].value = q2;
obj.options[i].selected = (j1 && true ) ? true : false
obj.options[j].selected = (i1 && true ) ? true : false
}
}
}
return true
}
16.what is legacy.
17.what is legacy api
18.what is legacy interface.
ans: legacy is something that is old in terms of technology/ system
19.what is main difference hash map and has table
ans:Hash table is synchronized
20.what is main difference between array list and vector.ans:Vector is synchronized
21.what is struts framework. sort of given什么意思
22.what are distributed technologies.
distributed technologies means any technology / s/w program that are
having many components in multiple environments that interact with each
other depending on the functional requirements and design.
23.what is advantage and disadvantage of distributed technologies.
Overdependent on single platform / single language is
avoided. Application can be built flexible to meet requirements.
Division of labour is possible. Best of all the technologies and
platforms can be optimally utilized. Complexity of requirements can be
reduced.
25.what is difference between procedure and functions.'
ans:Functions can return value ,procedures cant return value
26.what is jdbc.
ans:Connecting to DB from java program requires JDBC
27.what are type of drivers.
type1,2,3,4
29.how to collect requirements form u r client.
is not a job of a technical person. It is better for a BA to do it.
30.which process use in our project.
Generally u can say:
Project related process: Analysis, Design, Sign-off Documents,
Implementation, Integration, Testing, UAT
Work related process:
Technical Design, Work Allocation, Code Review Checklist, Unit Test Form
will be prepared by the Project Lead and given to the developer.
Developer prepares the Unit Test Case Implements Code, Performs Test
Submits Code through CVS / VSS
Submits documents along with Release Checklist to the tester / leader.
31.what is deployment descriptor.
ans:Which contains the information like which file to be used
40.what is platform independent
ans:A language is said to be platform independent if it can be run on any
machine with out modifying code
41.what is awt and swing.
ans:AWT are heavy weight components and swings are light weight components
46.what is major concepts in oops.
ans:Abstraction,polymorphism,encapsulation,inheritance
47.why u choose mvc-2 architecture.
ans:In MVC-2 controller is servlet rather than JSP which makes it
efficient
48.what is implicit object.

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