e063. getting the superclass of a class object.txt

这里面包含了一百多个JAVA源文件

Class cls = java.lang.String.class;
    Class sup = cls.getSuperclass();  // java.lang.Object
    
    cls = java.lang.Object.class;
    sup = cls.getSuperclass();        // null
    
    // The superclass of interfaces is always null
    cls = java.lang.Cloneable.class;
    sup = cls.getSuperclass();        // null
    
    // The superclass of primitive types is always null
    cls = int.class;
    sup = cls.getSuperclass();        // null