How to find vowels in a string in java program

What is the java coding to find out vowels in a string? How to use OR operator in java? because the symbol " || " is not taken while i executing the java program.

try the below code The program iterats over the given string and check if each character is an vowel 1. The symbol '||' can be used as OR, below program is an example

 public class Test {

    public static void main(String[] args) {    
        String str ="This is a test";
        for(int i=0;i <str.length();i++){
            if((str.charAt(i) == 'a') || 
                (str.charAt(i) == 'e')  ||
                (str.charAt(i) == 'i') || 
                (str.charAt(i) == 'o') ||
                (str.charAt(i) == 'u')) {
                System.out.println(" The String contains " + str.charAt(i));
            }
        }
    }
    }

Note: it will match only lower case vowels