При преобразовании String в Double выдаёт ошибку

public class Variables {
    public static void main(String[] args) {
        String str_s = "53,5";
        Double b = Double.parseDouble(str_s);
        System.out.println("b");
    }
}  

Exception in thread "main" java.lang.NumberFormatException: For input string: "53,5" at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043) at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110) at java.lang.Double.parseDouble(Double.java:538) at variables.Variables.main(Variables.java:20) C:\Users\Gidravlic\Documents\NetBeansProjects\Variables\nbproject\build-impl.xml:1040: The following error occurred while executing this line: C:\Users\Gidravlic\Documents\NetBeansProjects\Variables\nbproject\build-impl.xml:805: Java returned: 1 СБОРКА ЗАВЕРШЕНА СО СБОЕМ (общее время: 0 секунд)