Convert string case

Return	Method	Summary
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

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