How to use google+ api

Hi,
I am new to google+ api, and this is my first time using any sort of api.
I have downloaded and successfully configured google-plus-java-starter.

Now I want to get all my comments from my google+. But I am having difficulty doing it.

In standAlone Explorer at the google+ api, in Comments: get, where can I get the "commentId" ,
and in the Comments: list where I can get the "activityId"

Similarly, in the following code, where can I get the commentId.

[COLOR=#880000][FONT=inherit]// This sample assumes a client object has been created.[/FONT][/COLOR][COLOR=#000000][FONT=inherit]
[/FONT][/COLOR][COLOR=#880000][FONT=inherit]// To learn more about creating a client check out the starter:[/FONT][/COLOR][COLOR=#000000][FONT=inherit]
[/FONT][/COLOR][COLOR=#880000][FONT=inherit]// http://code.google.com/p/google-plus-java-starter/[/FONT][/COLOR][COLOR=#000000][FONT=inherit]

[/FONT][/COLOR][COLOR=#660066][FONT=inherit]Comment[/FONT][/COLOR][COLOR=#000000][FONT=inherit] comment [/FONT][/COLOR][COLOR=#666600][FONT=inherit]=[/FONT][/COLOR][COLOR=#000000][FONT=inherit] plusone[/FONT][/COLOR][COLOR=#666600][FONT=inherit].[/FONT][/COLOR][COLOR=#000000][FONT=inherit]comments[/FONT][/COLOR][COLOR=#666600][FONT=inherit]().[/FONT][/COLOR][COLOR=#000000][FONT=inherit]get[/FONT][/COLOR][COLOR=#666600][FONT=inherit]([/FONT][/COLOR][COLOR=#000000][FONT=inherit]commentId[/FONT][/COLOR][COLOR=#666600][FONT=inherit]).[/FONT][/COLOR][COLOR=#000000][FONT=inherit]execute[/FONT][/COLOR][COLOR=#666600][FONT=inherit]();[/FONT][/COLOR][COLOR=#000000][FONT=inherit]

[/FONT][/COLOR][COLOR=#660066][FONT=inherit]System[/FONT][/COLOR][COLOR=#666600][FONT=inherit].[/FONT][/COLOR][COLOR=#000000][FONT=inherit]out[/FONT][/COLOR][COLOR=#666600][FONT=inherit].[/FONT][/COLOR][COLOR=#000000][FONT=inherit]println[/FONT][/COLOR][COLOR=#666600][FONT=inherit]([/FONT][/COLOR][COLOR=#008800][FONT=inherit]"Got comment with ID "[/FONT][/COLOR][COLOR=#666600][FONT=inherit]+[/FONT][/COLOR][COLOR=#000000][FONT=inherit] comment[/FONT][/COLOR][COLOR=#666600][FONT=inherit].[/FONT][/COLOR][COLOR=#000000][FONT=inherit]getId[/FONT][/COLOR][COLOR=#666600][FONT=inherit]()[/FONT][/COLOR][COLOR=#666600][FONT=inherit]+[/FONT][/COLOR][COLOR=#000000][FONT=inherit]
        [/FONT][/COLOR][COLOR=#008800][FONT=inherit]" and contents "[/FONT][/COLOR][COLOR=#666600][FONT=inherit]+[/FONT][/COLOR][COLOR=#000000][FONT=inherit] comment[/FONT][/COLOR][COLOR=#666600][FONT=inherit].[/FONT][/COLOR][COLOR=#000000][FONT=inherit]getPlusObject[/FONT][/COLOR][COLOR=#666600][FONT=inherit]().[/FONT][/COLOR][COLOR=#000000][FONT=inherit]getContent[/FONT][/COLOR][COLOR=#666600][FONT=inherit]());
[/FONT][/COLOR]

Code (markup):

Thanks in advance.

 

i also need to knw ... how to use this?

 

I have downloaded a Google Plus Java Starter web app from

In this app there is already a publicActivityId is created

How can I create a new one?