How can I test if a character is a vowel using a single if statement?

How can I test if a single character is a vowel, using a single if statement?

More practically, how can I consolidate my current logic below into a single if statement?

if (valor == 'a'); System.out.println("xdd");
if (valor == 'e'); System.out.println("xdd");
if (valor == 'i'); System.out.println("xdd");
if (valor == 'o'); System.out.println("xdd");
if (valor == 'u'); System.out.println("xdd");

Try this. This will work whether valor is a character or a string.

if ("aeiou".indexOf(valor) >= 0) {
	System.out.println("xdd");
}

You can try String.indexOf()

final String vowels = "aeiou";
char valor = 'e';
if (vowels.indexOf(valor) != -1) {
    System.out.println("xdd");
}

You can leverage the || operator which basically serves as a or in a statement like so:

if(valor=='a'||valor=='e'||valor=='i'||valor=='o'||valor=='u'){
    System.out.println("xdd");
}

Since in this case, it will always print the same thing.

One easy method, which can also be easily expanded, is using an index string and checking if your variable is part of that String.

String vowels = "aeiou";
if (vowels.indexOf(valor) >= 0) {
    // do whatever you have to
}

Let valor is a character converted to String, then:

if ("AaEeIiOoUu".contains(valor)) {
    System.out.println("xdd");
}

Use a regex.

String str = "a";

if (str.matches("[AaeEiIoOuU]") {
    System.out.println("It's a vowel!");
}
 else {
   System.out.println("it's not a vowel!");
}

As many suggested, you can use indexOf or ||. I'll not repeat myself. You can use something as follows as well,

public class VowelOrNot {

    public static void main(String[] args) {

        String valor = "z";

        switch (valor.toLowerCase()) {
            case "a":
            case "e":
            case "i":
            case "o":
            case "u":
                System.out.println(valor + " is vowel");
                break;
            default:
                System.out.println(valor + " is consonant");
        }
    }
}

I'm using switch case. Which is handy when you want to avoid if-else/if-if ladder in multiple scenarios. Basically, if the input is matched with any of the case then it prints that string is a vowel else it is a consonant. Note, that break is important. Otherwise it will check default case and print consonant if given valor is a vowel.

If you want, you replace String with char in the variable declaration and handle it appropriately in switch cases.

You can easily achieve this by using the if conditional statements with java logical OR operator.

Using short circuit OR operator

This will be more efficient because this will return true at the first point when java meets the satisfying condition while checking the logical condition.

if(valor=='a'||valor=='e'||valor=='i'||valor=='o'||valor=='u'){
    System.out.println("xdd"); 
}