toUpperCase

toUpperCase()
toUpperCase(locale)

returns the String, converted to uppercase.

package lang;
 
public class Lang {
 
    public static void main(String[] args) {
 
        String str = "test 1234";
 
        str = str.toUpperCase();
        // str = str.toUpperCase(Locale.SIMPLIFIED_CHINESE); // for Simplified Chinese
 
        System.out.println(str+" in uppercase");
    }
}

 TEST 1234 in uppercase