i have doubt in string ,in the programm string is a data type or not

public class Name
{

public static void main(String args[])
{
String s="welcome";
System.out.println(s);
}
}

About us.

Ilaowai.net is the leading company offering a complete range of services for expatriates and foreign companies in China. We pride ourselves as a group offering efficient and high quality services, including but not limited, to the domain of:
Visa related application and consultation services,
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Accounts and Taxation related reports, management and consultation services.
In accordance to our expansion plans, we are currently recruiting dynamic and high caliber personals to join us for an exciting and rewarding career.

About the position.

We are currently recruiting for the position of IT Executive / Assistant Manager for our headquarters based in Guangzhou, China.

Job Description
Developing, maintaining and updating of company website and web based applications.
Maintaining and ensuring that the company’s internet based applications are well protected from various internet security risks.

Requirements
B...

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HI
I AM ARUN, CURRENTLY DOING MY PROJECT IN RECONFIGURABLE ARCHITECTURE I NEED HELP FROM U GUYS .I NEED SOME CODE RELATED TO THIS PROJECT.HOW TO CONVERT THE INSTRUCTION INTO JAVA.PLEASE GIVE ME SOME SUGGESTIONS.

I need to create a Java program that:

Takes as input a rooted tree T and a node c of T and converts T to another tree with the same set of node adjacency but now rooted at v.

any suggestions to start off?