toLowerCase() and toUpperCase(): convert string case with locale

String toLowerCase()

Converts this String to lower case using the rules of the default locale.

String toLowerCase(Locale locale)

Converts this String to lower case using the rules of the given Locale.

String toUpperCase()

Converts this String to upper case using the rules of the default locale.

String toUpperCase(Locale locale)

Converts this String to upper case using the rules of the given Locale.

public class Main {
  public static void main(String[] argv) {
    String str = "jAvA2s.com";
    System.out.println(str.toLowerCase());
    System.out.println(str.toUpperCase());

  }
}

The output:

java2s.com
JAVA2S.COM

1. String type and Literals
2. String Concatenation
3. String.CASE_INSENSITIVE_ORDER
4. String Constructor
5. charAt(int index):Get a single char by index
6. String: compareTo(String stringValue)
7. concat(String str)
8. equals():Compare two string value for equality
9. equals( ) vs ==
10. contains(CharSequence s)
11. copyValueOf(char[] data)
12. endsWith(String suffix)
13. format():Format a string
14. getBytes():Get byte array from string
15. getChars()
16. indexOf
17. intern a string
18. isEmpty:if string is empty
19. lastIndexOf()
20. length() Returns the length of this string
21. startsWith( )
22. toLowerCase() and toUpperCase(): convert string case with locale
23. substring:Get sub string from a string
24. toCharArray():Get char array from string
25. toString( )
26. trim()
27. valueOf():Convert boolean, char, double, float,int,long,object to String