e064. listing the interfaces that a class implements.txt

这里面包含了一百多个JAVA源文件

Class cls = java.lang.String.class;
    Class[] intfs = cls.getInterfaces();
    // [java.lang.Comparable, java.lang.CharSequence, java.io.Serializable]
    
    // The interfaces for a primitive type is an empty array
    cls = int.class;
    intfs = cls.getInterfaces();     // []