In Java, string creation can be a performance-intensive operation, especially when creating a large number of strings. Therefore, it is important to optimize string creation to improve the overall performance of a Java application. Here are some tips on how to optimize string creation in Java:

1. Use StringBuilder or StringBuffer: StringBuilder and StringBuffer are mutable classes that allow you to build a string gradually by appending characters or other strings. These classes are much faster than concatenating strings with the "+" operator, which creates a new string object every time it is used.

2. Use String.format(): String.format() is a method that allows you to create a formatted string using placeholders. It is faster than concatenating strings with the "+" operator, and it makes the code more readable.

3. Use intern(): The intern() method is a method of the String class that returns a canonical representation of the string. If a string with the same content already exists in the JVM's internal string pool, the intern() method returns that string instead of creating a new one.

4. Use char[] instead of String: If you need to create a large number of strings with similar content, consider using a char[] array instead of a String object. This approach can be more memory-efficient, as you can reuse the same char[] array to create multiple strings.

By following these tips, you can optimize string creation in Java and improve the performance of your application.