What are the different methods for Java strings?

There are many different methods for working with Java strings, commonly used methods include:

1. length(): returns the length of the string.
2. charAt(int index): returns the character at the specified index position.
3. substring(int beginIndex, int endIndex): Returns the substring between the specified start index and end index.
4. indexOf(String str): Returns the index of the first occurrence of the specified string in the string.
5. lastIndexOf(String str): returns the index of the last occurrence of the specified string in the string.
6. equals(Object obj): check if the string is equal to the specified object.
7. startsWith(String prefix): checks if a string begins with a specified prefix.
8. Check if the string ends with a specified suffix.
9. toUpperCase() function: Convert all characters in a string to uppercase.
10. toLowerCase() method: Converts all characters in a string to lowercase.
11. trim() function removes any leading or trailing whitespace from a string.
12. replace(char oldChar, char newChar): Replaces the specified character in the string with a new character.
13. The split method divides a string into an array of strings based on a specified regular expression.
14. concat(String str): appends the specified string to the end of the original string.
15. isEmpty() function checks if the string is empty or not.
16. Compare two strings in dictionary order.
17. checks whether the string contains the specified character sequence.
18. Generate a new string based on the specified format string and arguments.
19. Check if the string matches the specified regular expression.
20. valueOf(Object obj): Converts the specified object into a string representation.

These are just common string methods, the Java String class also offers many other useful methods.