write a hello world spring boot in sts

Sure, here are the steps to create a "Hello World" Spring Boot application in STS:

1. Open Spring Tool Suite (STS) and navigate to File -> New -> Spring Starter Project.
2. In the "New Spring Starter Project" window, enter a name for your project and click "Next".
3. Select the "Web" dependency from the list of available dependencies and click "Finish".
4. STS will generate a new Spring Boot project with a basic structure.
5. Open the "src/main/java" folder and navigate to the package that was created for your project.
6. Right-click on the package and select "New" -> "Class".
7. Name the class "HelloController" and click "Finish".
8. Open the "HelloController" class and add the following code:

package com.example.demo;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
	
	@GetMapping("/hello")
	public String hello() {
		return "Hello, World!";
	}

}

9. Save the class and run the application by right-clicking on the project and selecting "Run As" -> "Spring Boot App".
10. Open a web browser and go to "http://localhost:8080/hello". You should see the message "Hello, World!" displayed in the browser.

That's it! You have created a "Hello World" Spring Boot application in STS.