Java.String.toUpperCase()

最后修改: 2023-08-17T06:13:29+00:00

    The method toUpperCase() converts all characters of a String to upper case. If no Locale is passed to the method, then it will use the default Locale.

    However, it may produce unexpected results if it’s run on a system whose default Locale is different. To avoid this, we can simply pass the Locale to the method.

    Available Signatures

    public String toUpperCase()
public String toUpperCase(Locale locale)

    Example

    @Test
public void whenConvertToUpperCase_thenCorrect() {
    String s = "Welcome to Baeldung!";
    
    assertEquals("WELCOME TO BAELDUNG!", s.toUpperCase());
}