String className = "com.example.MyClass"; Classnames classNames = new Classnames(className); Class<?> myClass = MyClass.class; Classnames classNames = new Classnames(myClass); String className = "com.example.MyClass"; String className = "java.util.ArrayList"; Classnames classNames = new Classnames(className); Properties properties = new Properties(); properties.load(new FileInputStream("config.properties")); String className = properties.getProperty("class.name"); Class<?> myClass = new Classnames(className).load();