JAVA EE: Java Tutorial : Java String (toLowerCase and toUpperCase methods)

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ToLowerCaseDemo.java

/*
 * public String toLowerCase()
 * 
 * Returns: 
 * ------- 
 * the String, converted to lowercase.
 * 
 * ============================================
 * 
 * public String toLowerCase(Locale locale)
 * 
 * Parameters: 
 * ---------- 
 * locale - use the case transformation rules for
 * this locale.
 * 
 * Returns: 
 * ------- 
 * the String, converted to lowercase.
 */

import java.util.Locale;

public class ToLowerCaseDemo
{

    public static void main(String[] args)
    {
        String str1 = "WELCOME";
        String strLower1 = str1.toLowerCase();
        System.out.println("strLower1 = " + strLower1);

        String str2 = "HELLO";
        String strLower2 = str2.toLowerCase(Locale.CANADA);
        System.out.println("strLower2 = " + strLower2);

    }

}

Output

strLower1 = welcome
strLower2 = hello

ToUpperCaseDemo.java

/*
 * public String toUpperCase()
 *  * 
 * Returns: 
 * ------- * 
 * the String, converted to uppercase.
 * 
 * ===========================================
 * 
 * public String toUpperCase(Locale locale)
 *  
 * Parameters: 
 * ---------- 
 * locale - use the case transformation rules for
 * this locale.
 * 
 * Returns: 
 * ------- 
 * the String, converted to uppercase.
 */
import java.util.Locale;

public class ToUpperCaseDemo
{

    public static void main(String[] args)
    {
        String str1 = "welcome";
        String strUpper1 = str1.toUpperCase();
        System.out.println("strUpper1 = " + strUpper1);

        String str2 = "hello";
        String strUpper2 = str2.toUpperCase(Locale.ITALIAN);
        System.out.println("strUpper2 = " + strUpper2);
    }
}